Canon EF400 User Manual

EF400mm f/4 DO IS USM

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Instruction

Thank you for purchasing a Canon product.

	The Canon EF400mm f/4 DO IS USM lens is a							Features
	high-performance, super telephoto lens
								1.	The multi-layer diffractive optical element effectively
	dedicated to Canon EOS cameras. Besides
									corrects chromatic aberrations prone to occur in super
	having an Image Stabilizer, it is the world's								telephoto lenses. It provides high image quality while
	first camera lens incorporating a multi-layer								maintaining compactness and light weight.
	diffractive optical element (DO).							2.	The Image Stabilizer gives the equivalent effect of a
	The multi-layer diffractive optical element is a								shutter speed two stops faster*.
	revolutionary element having the								The lens also has a second image stabilizer mode that is
	characteristics of both fluorite and aspherical								optimized for following shots of moving subjects.
	elements. It greatly contributes to the lens'							3.	Ultrasonic motor (USM) for quick and quiet autofocusing.
	compactness, light weight, and high image							4.	Manual focusing is available after the subject comes into
	quality.								focus in autofocus mode (ONE SHOT AF).
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	• "DO" stands for Diffractive Optics.							5.	The AF Stop button for stopping the AF operation at
									anytime.
	• "IS" stands for Image Stabilizer.
								6.	The lens is compatible with Extender EF1.4X ll and
	• "USM" stands for Ultrasonic Motor.
									EF2X ll.
	Conventions used in this instruction							7.	Tight seal structure ensures excellent dust-proof and
					Warning to prevent lens or camera malfunction				drip-proof performance.
								8.	Designed for lighter weight with major parts made of
					or damage.
									magnesium alloy.
					Supplementary notes on using the lens and
								* Based on [1/focal length] second. Generally, it requires
					taking pictures.
								a shutter speed [1/focal length] second or faster to
								prevent camera shake.

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a Safety Precautions

				This device complies with Part 15 of the FCC Rules. Operation is
	a Safety Precautions
				subject to the following two conditions: (1) This device may not
	•	Do not look at the sun or a bright light source		cause harmful interference, and (2) this device must accept any
		through the lens or camera. Doing so could result in		interference received, including interference that may cause
				undesired operation.
		loss of vision. Looking at the sun directly through the
				Do not make any changes or modifications to the equipment
		lens is especially hazardous.
				unless otherwise specified in the instructions. If such changes or
	•	Whether it is attached to the camera or not, do not		modifications should be made, you could be required to stop
		leave the lens under the sun without the lens cap		operation of the equipment.
		attached. This is to prevent the lens from concentrating		This equipment has been tested and found to comply with the limits
		the sun’s rays, which could cause a fire.		for a class B digital device, pursuant to part 15 of the FCC Rules.
				These limits are designed to provide reasonable protection against
	•	Do not stand on the lens case. Falling off the case
				harmful interference in a residential installation. This equipment
		could result in injury.
				generates, uses and can radiate radio frequency energy and, if not
	•	Do not stack lens cases. A falling lens case could
				installed and used in accordance with the instructions, may cause
		cause an injury.		harmful interference to radio communications.
				However, there is no guarantee that interference will not occur in a
				particular installation. If this equipment does cause harmful
	Handling Cautions
				interference to radio or television reception, which can be determined
	•	If the lens is taken from a cold environment intoCOPYa by turning the equipment off and on, the user is encouraged to try to
		warm one, condensation may develop on the lens		correct the interference by one or more of the following measures:
		surface and internal parts. To prevent condensation		• Reorient or relocate the receiving antenna.
		in this case, first put the lens into an airtight plastic bag		• Increase the separation between the equipment and receiver.
				• Consult the dealer or an experienced radio/TV technician for help.
		before taking it from a cold to warm environment. Then
		take out the lens after it has warmed gradually. Do the		This Class B digital apparatus complies with Canadian ICES-003.
		same when taking the lens from a warm environment
		into a cold one.		a Shooting Precautions
	• Do not leave the lens in excessive heat such as in a
		car in direct sunlight. High temperatures can cause		If a very bright spotlight like a mercury lamp is
				photographed in a dark place with this lens, a
		the lens to malfunction.
				halo of light may occasionally appear around the
				light source because of the DO elements.
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Nomenclature
Hood mount (→ 10)	Focusing ring (→ 5)
	Focusing distance range selection switch (→ 5)
	Distance scale (→ 6)
	Strap mount (→ 4)
	Drop-in filter (→ 12)
	Rubber ring (→ 4)

AF stop button	COPY
(→ 6)
		Contacts (→ 4)
Focus mode switch (→ 5)		Lens mount index (→ 4)
Image stabilizer switch (→ 7)
		Tripod mount (→ 11)
Image stabilizer mode selector switch (→ 7)		Tripod collar index (→ 11)
		Orientation locking knob (→ 11)
For detailed information, reference page numbers are provided in parentheses (→ **).

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Thread the end of the strap through the strap mount on the lens and then back through the clasp on the strap. Pull the strap tight and check that there is no slack in the clasp.

1. Mounting and Detaching the Lens

See your camera’s instructions for details on mounting and detaching the lens.

The lens mount has a rubber ring for enhanced waterand dust-resistance. The rubber ring may cause slight abrasions around the camera's lens mount, but this will not cause any problems. If the rubber ring becomes worn, it is replaceable by a Canon Service Center at cost.

• After detaching the lens, place the lens with the
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rear end up to prevent the lens surface and		Attaching the strap
electrical contacts from getting scratched.
• If the contacts get soiled, scratched, or have
fingerprints on them, corrosion or faulty
connections can result. The camera and lens
may not operate properly.

•If the contacts get soiled or have fingerprints on them, clean them with a soft cloth.

•If you remove the lens, cover it with the dust cap. To attach it properly, align the lens mount index and the K index of the dust cap as shown in the diagram, and turn clockwise. To remove it, reverse the order.

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2. Setting the Focus

3. Switching the Focusing

Mode

Distance Range

To shoot in autofocus (AF) mode, set the focus		ou can set the focusing distance range to
mode switch to AF.		3.5 m/11.5 ft. to infinity or 8 m/26.2 ft. to infinity.
To use only manual focusing (MF), set the focus		By setting the suitable focusing distance range,
mode switch to MF, and focus by turning the		the actual autofocusing time can be shorter.
focusing ring. The focusing ring always works,
regardless of the focus mode.	COPY
		If you autofocus outside the set focusing distance
		range, the lens may stop focusing at the start of
After autofocusing in ONE SHOT AF mode, focus		the focusing range; however, this is not a
manually by pressing the shutter button halfway		malfunction. Press the shutter release button
and turning the focusing ring. (Full-time manual		halfway again.
focus)

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