CANON EOS-1V Technical Information

Part 2

Technical

Information

1. TECHNICAL DESCRIPTION

1.1 AF System

While based on the EOS-3, the EOS-1V’s AF system incorporates major enhancements including a newly designed AF unit and a new AI Servo AF sequence and algorithm for improved speed, precision, and reliability. Other components are based on the EOS-3’s such as the large, oval secondary mirror, the optical system’s basic configuration and focusing principle, the focusing point’s automatic selection algorithm, and the low-contrast countermeasures.

1) Faster Area AF

● High-speed, 33.3 MHz, RISC microcomputer and high-speed software processing

The high-speed RISC microcomputer with a clock speed of 33.3 MHz is dedicated to AF calculations and shooting data memory. The processing speed is faster than the EOS-3’s (clock speed:

24.576 MHz). And with the same highspeed, predictive calculation algorithm and other software processing, the focusing point selection speed is faster than the EOS-3’s. Even the manual focusing point selection speed is the world’s fastest.

2) Area AF with higher precision

● Improved S/N ratio and in-focus indicator with guaranteed precision

q To further improve the S/N ratio, the sensor’s effective light-sensing area per

pixel has been increased by 12 percent. Also, the AF sensor’s light-sensing surface has an anti-reflection layer to reduce the ghosting that affects the S/N ratio. (Fig. 2-1)

w In low-light, whether focus has been achieved or not depends on how reliable the

focusing signal is. To obtain the correct result, focusing signal precision has been given priority. Of course, focusing precision is officially guaranteed in low light down to EV 0.*

* Although this specification is common to all EOS cameras, it has not been men-

tioned in the manual until now.

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Part 2: Technical Information

Camera EOS-1 EOS-1N EOS-3 EOS-1V

Basic Clock Speed

12 MHz 12 MHz

24.576 MHz

33.3 MHz

Fastest Processing Speed

0.33 µs

0.17 µs

0.04 µs

0.03 µs

Table 2-1 AFCPU

Fig. 2-1 EOS-1V’s AF sensor. Fig. 2-2 EOS-3’s AF sensor.

3) Area AF with higher reliability

● New AF optical system eliminating unstable precision

The new AF optical system (Fig. 2-3) does not have the fully-reflective mirror 2 which the EOS-3 has near the sensor. The mirror’s reflective surface which caused unstable precision has thereby been eliminated. Also, the secondary image-forming lens is now made of molded glass instead of plastic resin. It enables consistent focusing precision even under high temperatures and humidity.

● AF unit in a strong box

The AF unit’s AF chassis (Fig. 2-4) is now made of a material whose properties change little when the humidity changes. The rigid box construction is also able to withstand shock and other environmental influences to improve precision stability.

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Part 2: Technical Information

Prime lens

Main reflex mirror

Secondary mirror

Prime lens

Main reflex mirror

Secondary mirror

Fully-reflective mirror Fully-reflective mirror 1

Fully-reflective mirror 2

Secondary image-forming lens

Area AF sensor

Secondary image-forming lens

EOS-1V AF optical system EOS-3 AF optical system

Fig. 2-3 Comparison of the EOS-1V and EOS-3’s AF optical systems.

Fully-reflective mirror 1

Fully-reflective mirror 2

Infrared filter

Fixed diaphragm

Secondary image-forming lens

Center holder

Area AF sensor

Fully-reflective mirror

AF chassis

Infrared filter

Fixed diaphragm

Secondary image-forming lens

Center holder

Area AF sensor

EOS-1V AF unit EOS-3 AF unit

AF chassis

Fig. 2-4 Comparison of EOS-1V and EOS-3’s AF units.

4) Predictive AI Servo AF Control

During continuous shooting, the EOS-3’s AI Servo AF incorporates shutter release priority for the first shot and focusing priority (lens drive priority) from the second shot onward. So for a fast-moving subject at a close distance, the first shot might be out of focus (the point of focus is in front of the subject) or camera shake may cause focusing error. This causes the continuous film advance speed to become irregular. To resolve this problem with the EOS-1V, the priority control for the first shot during AI Servo AF continuous shooting has been changed and the predictive AF algorithm and continuous shooting sequence for 9 fps have been newly developed. The result is better focus tracking of the subject and better focusing precision. The continuous film advance speed is also more stable.

(1) AI Servo AF control for the first shot The EOS-3’s predictive AF control (Fig. 2-

5) stops driving the lens immediately when the shutter is released. Therefore, for a subject moving quickly across the image plane, the camera must overshoot the predictive lens drive amount to compensate for the time lag between the lens drive stoppage and the start of the exposure. Depending on the moment of the shutter release, the lens drive overshoot might be excessive, resulting in the point of focus falling slightly in front of the subject. Since a point of focus in front of the subject is more favorable (the picture is still salvageable) than one behind the subject, this control inclination was intentional.

● The lens, aperture, and mirror are driven

simultaneously from the first shot with the EOS-1V.

When focus must be achieved as quickly as possible during AF search, the standard power is used after focus is achieved during AI Servo AF when the lens drive amount for the maximum power and time is minimal. This enables the predictive lens drive, aperture, and reflex mirror to be driven simultaneously (with or without PB-E2 attached). It reduces the lens drive overshoot amount before the shutter is released.

* AF search drive: During SW-1 ON when the AF system cannot detect the sub-

ject, the lens is driven to find the subject.

* AI Servo AF drive: After focus is achieved, the moving subject is tracked during

continuous focusing.

* Standard power: This is the amount of power supplied to the lens at the EOS-

1N’s level.

* Maximum power: This is twice the amount of the standard power.

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Part 2: Technical Information

Shutter released

EOS-3

Lens drive stops Aperture stopped down

Mirror goes up

Exposure

Shutter released

AI Servo AF

Lens driven

AI Servo AF

Lens driven

EOS-1V

Aperture stopped down

Predictive lens drive

Mirror goes up

Lens drive stops

Exposure

AF search

Lens driven

AF search

Lens driven

Maximum power supplied.

Power cut by half.

Power stopped.

Power supply to lens drive

Fig. 2-5 Comparison of

AI Servo AFcontrol.

● Lens driving time setting after SW-2 ON

Regardless of when the shutter is released, the lens drive stops at the predicted point of focus. The lens driving time after SW-2 ON is set (0 - 35 ms). Thus, while shutter release-priority is maintained, the correct focus drive is obtained for the predicted point of focus.

(2) AI Servo AF control from the second shot onward To improve the EOS-1V’s AI Servo AF tracking perfor mance and focusing precision and to maintain the film advance speed at a consistent level, the following measures were incorporated. Other than the below, the basic AI Servo AF control system is the same as the EOS-3’s.

q New predictive AF algorithm suited for 9 fps

● High-precision, predictive AF with statistical operation and analysis

The EOS-3 refers to the last three focusing data readings to predict the next point of focus. However, the EOS-1V uses more focusing data for statistical operation and analysis (Fig. 2-6) and compensates for focusing error while predicting the point of focus. This increases the probability of obtaining the correct focus in the AI Servo AF mode. And since this enables a stable lens drive and a correct predictive point of focus, it is more likely for the lens drive to end within the time alloted during the maximum-speed sequence of 9 fps. This also helps to stabilize the continuous shooting speed. Table 2-2 shows the process of predicting the point of focus from the first to fourth focusing attempts and beyond.

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Part 2: Technical Information

, Focusing error

Far

Movement speed on image plane

Low speed

High speed

Near

Subject distance

Predictive point of focus with other cameras

Statistical operation and predictive point of focus

Subject movement condition/

Fig. 2-6 Comparison of statistical operation and conventional predictive operation.

Focusing Attempts

First time

Second time

Third time

Fourth time onward

Predictive Focusing Method The lens drive amount from the point of defocus to the point of focus is detected. With the first focusing data reading, the next point of focus is predicted. With the first and second focusing data readings, the next point of focus is predicted. The focusing data obtained so far is used for statistical operation and the focusing error is

corrected to obtain a more precise predicted point of focus.

Table 2-2 Point of Focus Prediction Process

w New continuous shooting sequence

With the EOS-3, the shutter releases immediately when the lens driving ends. This causes an irregular lens driving time which in turn makes the film advance speed irregular as well. Since the focusing time for each shot is also irregular, predictive focusing control also becomes more difficult.

● Exposure standby until the set time after the lens drive ends

During the 9 fps continuous shooting sequence, the exposure is delayed until the set standby time elapses (since the lens is being driven forward during this standby time, the focus is not affected) even if the lens drive ends earlier (Fig. 2-7). The standby time cushions the irregular lens driving time, and it thereby stabilizes the continuous shooting speed increases the probability for achieving correct focus.

● Securing the exposure standby time

The shooting speed is set to 9 fps even when AI Servo AF can exceed 9 fps. The extra time is used to stabilize the continuous shooting speed. The ultra-high speed shooting sequence at 10 fps in the One-Shot AF mode and the new predictive AF algorithm and high-speed EF lenses make it possible to set a standby time. In the high-speed continuous shooting mode at 7 fps, the sequence provides even more extra time. Continuous shooting in the AI Servo AF mode is therefore more stable than with the EOS-3.

● Continuous shooting speed adjusted to suit the lens driving time

If the lens driving cannot be completed within the set time due to difficult subject tracking conditions, the film advance speed is decreased (in 0.5 fps increments) to a stable level that is maintainable. This is to prevent the film advance speed from becoming irregular. When the subject tracking becomes easier, the film advance speed is increased again.

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Part 2: Technical Information

Standby

AF AF

Lens driven

Exposure starts

Standby

Lens driven

Standby

Lens driven

Exposure starts Exposure starts

AF AF

Lens driven

Exposure starts

Lens driven

Exposure starts Exposure starts

The standby time absorbs the irregular lens driving time, and the AF interval and exposure interval become uniform.

With no standby time, the irregular lens driving time directly affects the AF interval and exposure interval.

Standby time provided

No standby time

Fig. 2-7 Comparison of continuous shooting sequences.

(3) Preconditions for attaining 9 fps When the PB-E2 + NP-E2 and an EF lens having the EF 300mm f/2.8L IS USM’s lens drive speed are attached to the camera and the lens EMD stopdown time is 35 ms or shorter (equivalent to 2 stops worth with the EF 300mm f/2.8L IS USM), 9 fps is attained when the lens drive ends within the time in the maximum-speed sequence described above. The EMD stopdown time decreases the continuous shooting speed accordingly. Also, when the focusing point selection is automatic during predictive AF and the subject moves to another focusing point, the continuous shooting speed and the predictive AF perfor mance deteriorate slightly (by how much depends on how often the subject moves to another focusing point) due to the extra focusing and processing time required. The deterioration occurs even while the PB-E2 is attached to the camera.

e Predictive AF control perfor mance

● 50 kph at 8 meters

The camera can focus track a subject approaching the camera at 50 kph up to 8 meters away (with the EF 300mm f/2.8L IS USM). Each of the 45 focusing points is capable of the same predictive AF perfor mance. As mentioned before, AI Servo AF control for the first shot is the same with or without the PB-E2 attached. Therefore, the predictive AF perfor mance with the EOS-1V is the same with or without the PB-E2 attached. When the battery becomes exhausted, the lens, aperture, and reflex mirror are driven sequentially instead of simultaneously, resulting in lower perfor mance of the predictive AF control.

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Part 2: Technical Information

100

[m]

Subject Distance

5 10 50 100 500

Subject Movement Speed (kmh)

EOS-1N + PDB-E1: 5 fps

EOS-1V: 9 fps EOS-3: 7 fps

Fig. 2-8 Comparison of predictive AF control performance.

1.2 Viewfinder

1) Configuration

The viewfinder’s basic optical system is the same as the EOS-3’s. The coverage is 100%, the viewfinder magnification is 0.72 ×, dioptric correction is provided, an eyepiece shutter is provided, and superimposition (SI) display optics is provided. Even without the Eye Control unit, there was a problem with too little space. The basic configuration was revamped to minimize space requirements, and the SI display brightness was increased. The major changes in the configuration are as follows:

● Pentaprism with a high refractive index

To shorten the viewfinder’s optical path and secure a viewfinder magnification of

0.72 ×, glass with a high refractive index was incorporated in the pentaprism.

● New SI display optics

The EOS-3’s SI display optics have a dichroic mirror between the pentaprism and eyepiece lens. With this configuration, if the viewfinder coverage is increased or if dioptric correction is incorporated, the optical path will become longer, resulting in a lower viewfinder magnification. In the case of the EOS-1V, the dichroic mirror has been replaced by a prism (Fig. 2-9) to shorten the viewfinder optical path. And with the pentaprism having a high refractive index, the same viewfinder magnification as the EOS-1N’s could be secured.

● Retractable dioptric correction lens

When the eyepiece shutter is closed, the dioptric correction lens retracts toward the pentaprism automatically. The eyepiece shutter and dioptric correction lens share the same operation space. The dioptric correction mechanism is the same as the EOS-1N’s.

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Fig. 2-9 Center cross section.

Metering sensor, 21-zone SPC

Metering lens

SI mirror

SI-LCD

SI lens

Eyepiece lens 1

Eyepiece shutter

SI prism 1

SI prism 2

Eyepiece lens 2

(Dioptric correction lens) H-LCD

H-LCD prism

Film plane

Secondary mirror

CMOS Area AF sensor

Secondary image-forming lens

Fixed diaphragm

Infrared filter

Fully-reflective mirror

45-deg. main mirror

Focusing screen

Laser Matte surface

Condensor lens

Pentaprism

2) Superimposition display optics

Except for not having a dichroic mirror between the pentaprism and eyepiece lens, the SI display optics (Fig. 2-10) for the focusing points are basically the same as the EOS-3’s. The improvements are a brighter SI display and an SI display that is easier to see (Fig. 2-11).

● Display brighter by over 2 stops

The backlight optics uses a direct system (lens × 2) instead of a diffusion system (fresnel lens + diffusion panel). It eliminates the light loss inherent with the fresnel lens and diffusion panel and increases the display brightness by over 2 stops.

● Clear SI display

By incorporating an aspherical surface for backlight lens 2 and the two SI lenses (focusing point image-forming lens), a clear SI display with minimal aberrations is obtained.

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Part 2: Technical Information

Focusing screen

Eyepiece lens

SI lens 1

SI lens 2

SI-LED

Pentaprism

Condensor lens

SI prism 1

SI prism 2

Backlight lens 1

Backlight lens 2

SI mirror

Metering sensor

Metering lens

SI-LCD

Fig. 2-10 SI display optics.

SI-LED

SI-LCD

SI lens Eyepiece lens

Fresnel lens

Diffusion panel

Backlight lens

EOS-3

EOS-1V

Fig. 2-11 Comparison with the EOS-3’s SI display optics.

1.3 Exposure Control

1) Metering

(1) Metering optics and the AE sensor The EOS-1V’s metering optics (see Fig. 2-10 on the preceding page) are positioned above the eyepiece lens to avoid obstructing the SI display optics. Evaluative metering and E-TTL autoflash use a new algorithm. Otherwise, the other sensors and metering methods have the same specifications as the EOS-3’s.

(2) Evaluative metering The EOS-3’s 21-zone evaluative metering system has won high praise. However, a few users have pointed out that the exposure can become inconsistent when the picture is recomposed slightly. The EOS-1V uses a new algorithm so that a more consistent exposure is obtained with 21-zone evaluative metering while automatic exposure compensation (a strong point of the EOS evaluative metering system) remains intact.

● EOS-3’s evaluative metering system

The EOS evaluative metering system hitherto centered the main metering area around the active focusing point and executed automatic exposure compensation for the different brightness (mainly the differ ence with the backlight areas) of the adjacent and peripheral areas. However, since the EOS-3’s main metering area is almost as narrow as the spot metering area, shifting the main metering area even slightly can cause the automatic exposure compensation amount to change (Fig. 2-12). Thus, the exposure setting can change even with a slight change in the subject framing. Also, during continuous shooting of a moving subject with AI SERVO AF and automatic focusing point selection, the resulting exposures tended to be irregular in the same series of continuous shots as the focusing point shifted to next one. The shifting focusing point also shifted the main metering area, causing the meter reading to change.

● EOS-1V’s evaluative metering system

The EOS-1V’s evaluative metering system is linked to and weighted on the active focusing point and the meter reading is averaged (Fig. 2-14). Automatic exposure compensation is set for bright subjects. In effect, the manual exposure compensation set for a bright background during centerweighted averaging metering has been replaced by focusing point-linked automatic exposure compensation. In other words, evaluative metering is now weighted less on the active focusing point’s metering area. This makes the exposure more consistent even when the framing is changed slightly. When focus is achieved at the desired location with a manually-selected focusing point in the One-Shot AF mode, it is highly likely that the main metering area will cover the main subject completely. Therefore, if the main metering area’s brightness level is still low after the automatic exposure compensation for a bright

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Part 2: Technical Information

The main metering

The main metering area covers

the subject completely.

The main metering area is shifted to

cover the subject partially.

Fig. 2-12 EOS-3’s evaluative

metering system.

Fig. 2-13 Metering pattern for

centerweighted metering.

background, conventional evaluative metering is applied for backlight exposure compensation to suit the main metering area’s brightness level (see Table 2-3). Backlight exposure compensation is applied mainly under cloudy conditions, daylight shadows, and other backlit conditions when exposure compensation for a bright subject is not likely to be applied. Evaluative metering is executed in the following steps: q The metering is averaged while weighted on the focusing point and correspond-

ing metering area. If the active focusing point is on the border of the metering area, the metering area with a less bright meter reading is selected as the focusing point’s corresponding metering area.

w If the metered value is higher than the stipulated brightness level, several adja-

cent bright areas are sampled starting with the brightest area. If the metered value is lower than the stipulated brightness level, conventional evaluative metering is applied. The value obtained in q is used as the final reading.

e The sampled bright areas are averaged and a positive amount of exposure com-

pensation is added.

r With manual focusing point selection + One-Shot AF, backlit exposure compen-

sation obtained with conventional evaluative metering is also applied if the subject’s brightness level at the main metering area is still low even after exposure compensation for a bright subject is applied.

● Evaluative metering for consistent exposures and easy detection of required exposure

compensation

This evaluative metering uses a relatively simple algorithm which weights the metering relatively lightly on the active focusing point and corresponding metering area and mainly compensates for high-level brightness instead. Thus, a proper exposure is obtained consistently even if the framing is slightly altered. For users who mainly use centerweighted averaging metering, it makes it easier to see how exposure compensation is applied.

Fig. 2-14 Sample metering patterns of focusing point-weighted averaging metering.

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Part 2: Technical Information

Table 2-3 Conditions for evaluative

metering and exposure compensation.

Manual Focusing Automatic Focusing

Point Selection Point Selection

ONE SHOT AF

Brightness compensation

Brightness

+ Backlit compensation

compensation only

AI SERVO AF Brightness compensation only

Partial and spot metering coverage

Since the EOS-3’s viewfinder coverage is 100% instead of 97%, the partial and spot metering coverage has become slightly smaller. However, if you round off the figure to the second decimal place, it becomes the same as the EOS-3. Thus, the EOS-1V’s partial and spot metering coverage is the same as the EOS-3’s at approx. 8.5% for partial and 2.4% for spot metering. (These are official specifications.)

3) E-TTL autoflash To obtain a more consistent flash exposure, the main flash output calculation algorithm has been changed. With the EOS-3, the main flash output is determined by the preflash reflected off only the areas covered by the main flash metering area (covering the main subject) and adjacent flash metering areas. Thus, if the picture is even slightly recomposed, a different flash exposure (Fig. 2-15) may result as in the case of evaluative metering. With the EOS-1V, preflash meter readings are taken from the main flash metering area covering the main subject and from a peripheral group of flash metering areas (Fig. 2-15 - q ) which received the brightest r eflectance. The metering weight of the main flash metering area and the weight of the brightest peripheral group are averaged to determine the main flash output. Since the peripheral group covers a larger area than with the EOS-3, the algorithm selects a more consistent flash exposure level even if the framing changes slightly. During automatic focusing point selection, the metering is weighted more on the peripheral flash metering area than on the main flash metering area. This results in a more consistent flash exposure level even if the subject framing is changed slightly. In the case of manual focusing point selection, it is more likely that the entire main flash metering area will cover the subject. Therefore, the metering is weighted more on the main flash metering area than on the peripheral flash metering area. If a peripheral flash metering area receives an abnormally high preflash reflectance, the peripheral flash metering area expands (Fig. 2-15 - w ) and the metering weight is averaged with the weight of the main flash metering area. The main flash output is thereby determined.

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Part 2: Technical Information

q E-TTL autoflash metering areas

w E-TTL autoflash metering areas for abnormally high preflash reflectance.

Fig. 2-15 Grouping of peripheral flash metering areas

2) Exposure control system

The EOS-1V’s exposure control is the same as the EOS-3’s.

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Part 2: Technical Information

3) Exposure control mechanism

(1) Shutter While based on the EOS-3’s shutter, the EOS-1V’s shutter (made by Canon) features improved basic perfor mance, reliability, and durability. The official shutter durability specification is 150,000 cycles. In actual tests, the shutter lasted up to 200,000 cycles. The operation principle, unit appearance, and the maximum bulb exposure time (1,000 hr) are all the same as the EOS-3’s shutter. q Improved shutter curtain-driving

spring and coil for faster operation A more powerful shutter curtain-driving spring and coil (Fig. 2-16) enables the maximum shutter speed of 1/8000 sec. and maximum X-sync speed of 1/250 sec. (curtain speed of

2.2 ms/24 mm).

w Higher precision

To enhance precision, the motor shaft now has a different shape, material, and surface finish to lower friction and the shape of the release lever has been changed.

e Carbon fiber shutter curtains for better strength and durability

The slit-producing shutter curtains are made of carbon fiber to make the curtain unit lighter, stronger, and more durable.

r Anti-friction material and surface finish for better durability

To improve durability, the rotating shafts and bearings of all drive levers are now made of a material and surface finish having excellent anti-friction properties.

t Stronger shutter curtain braking for added durability

To cope with the faster shutter curtain drive speed, the curtain brake mechanism is now stronger for better durability.

Table 2-4 Shutter Design Specifications

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Part 2: Technical Information

Fig. 2-16 Exploded view of shutter unit.

Item

1. Type

2. Shutter curtain system

3. Shutter curtains

4. Shutter curtain material

5. Curtain driver

6. Shutter speed control

7. Curtain speed

8. Shutter speed range

9. Max. flash sync speed

10. Signal

Design Specifications Vertical-travel, focal-plane shutter Rectangular, parallel-linked type 1st curtain: 5, 2nd curtain: 5, total 10 2 curtains made of carbon fiber, 3 curtains made of ultra-duralumin 2 curtains made of carbon fiber, 3 curtains made of ultra-duralumin 1st and 2nd curtains each have two dedicated torsion springs All speeds electronically controlled by controlling the conduction of power

to the dedicated magnets for the 1st and 2nd curtains, (Magnet type: Newly-developed, rotary magnet)

Approx. 2.2 ms/24 mm 30 - 1/8000 sec., bulb 1/250 sec. Two types: q X-sync and w 2nd-curtain synchronization

1st curtain 2nd curtain

Coil (for 2nd curtain)

Yoke (for 2nd curtain)

Magnet × 2

Cam (for 2nd curtain)

2nd curtain fixed lever

2nd curtain drive lever

2nd curtain

1st curtain

1st curtain drive lever

1st curtain fixed lever

Cam (for 1st curtain)

Yoke (for 1st curtain)

Coil (for 1st curtain)

Chip condensor × 2

1.4 Film Transport

● High-power film advance motor M1, ● film advance with floating support, and

● a film transport detection system compatible with infrared film. Other features

are the same as with the EOS-3 (see the EOS-3’s Technical Information Part 2).

1) High-power, film advance motor

The EOS-3 uses a motor having a rated voltage of 6 V. The EOS-1V uses the same high-power, 12 V motor as the EOS-1N. And with the 12 V power supplied directly by the PB-E2, the EOS-1V can attain a continuous shooting speed of 10 fps. The difference between the motors used in the EOS-3 and EOS-1V lies in the design concept. The EOS-3 provides adequate performance even without the PB-E2. It uses a 6 V motor to match the 2CR5 6 V battery used when the EOS-3 is powered internally. Whereas the EOS1V was primarily designed to attain maximum performance with the PB-E2 attached. It therefore uses a 12 V motor. See Table 15 for the speed difference with and without the PB-E2 for both cameras.

● Preconditions to attain 10 fps

The PB-E2 and NP-E2 are attached and the lens EMD stopdown time is 35 ms or shorter (equivalent to 2 stops worth with the EF 300mm f/2.8L IS USM). If the aperture is stopped down, farther the continuous shooting speed decreases due to the increased EMD stopdown time. The continuous shooting speed does not differ with different lenses.

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Part 2: Technical Information

Table 2-5 Maximum Continuous

Shooting Speed (fps)

M-1: Dedicated motor for film advance

Guide roller 1

M-2: Cocks the shutter and quick-return reflex mirror and rewinds the film

Guide roller 2

Guide roller 1

M-2: Dedicated motor for film rewind

M-3: Cocks the shutter and quick-return reflex mirror

Lo planetary gear

Hi planetary gear

(2) Three-motor system with PB-E2 attached

(1) Two-motor system (without PB-E2)

Fig. 2-17 Film transport system.

Camera only

PB-E2 + NP-E2

EOS-1V

3.5 fps 10 fps

EOS-3

4.3 fps 7 fps

2) Silent film advance

The floating supports at four places (Fig. 2-18) in the film advance unit have reduced the film advance noise and vibration (Table 2-6). The shutter cocking system’s floating supports also help to reduce the continuous film advance noise.

● Discernable noise cut by half with low-speed cocking

With the Personal Function PF-21 “Silent (lowspeed) film advance after film is exposed and shutter button turns off,” silent film advance is possible with the EOS-1V (without PB-E2) set to single-frame advance. The noise level is 5 dB lower than the standard cocking noise which is about half the discernable noise level (Table 2-7). Also, since low-speed film advance suppresses the high-frequency range (4 - 8 KHz), it actually sounds much quieter. With mirror lockup, the noise comes from only the shutter, making it even more quiet. It is suited for when noise is unwanted. By employing a slow speed (the film advance speed is unchanged) for cocking the shutter and mirror which usually makes a large noise, the operation is quieter. The M2 motor’s PWM control and silent rewind have been applied to the cocking of the shutter and mirror.

3) Film transport detection system

● Compatible with infrared film

The film perforation is detected optically with a photo reflector (Fig. 2-19). The upper half of the perforation is detected by condensor optics. Masking material is used to shield the picture area against the infrared light. This enables infrared film to be used. Also, the light reception efficiency has been improved with the condensor optics, and the infrared light intensity has been reduced to further decrease the chances of fogging the film.

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Part 2: Technical Information

Fig. 2-18 Film advance unit’s

floating supports.

EOS-1V

EOS-3

EOS-1N

Continuous Shooting

79.2 (7)

87.1 (7)

78.9 (6)

Single-Frame Shooting

76.2

77.8

79.7

Table 2-6 Comparison of shutter release and film

advance noise in dB (fps)

Standard Cocking Low-speed Cocking

Noise

67 62

Film Advance

time

0.46

0.73

Table 2-7 Comparison of cocking noise

(dB) and time (sec.)

Fig. 2-19 Film transport

detection system.

Rubber bushing × 1

Rubber bushing × 3

Spool

M1: Film advance motor

Infrared film fogging area

Photo reflector for film transport detection

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