G4 Series Mark II
Cooled CCD Cameras
User’s Guide
Version 1.1
Modified on July 27th, 2018
All information furnished by Moravian Instruments is believed to be
accurate. Moravian Instruments reserves the right to change any
information contained herein without notice.
G4 cameras are not authorized for and should not be used within Life
Support Systems without the specific written consent of the Moravian
Instruments. Product warranty is limited to repair or replacement of
defective components and does not cover injury or property or other
consequential damages.
Copyright © 2000-2018, Moravian Instruments
Moravian Instruments
Masarykova 1148
763 02 Zlín
Czech Republic
phone: +420 577 107 171
web: http://www.gxccd.com/
e-mail: info@gxccd.com
Table of Contents
Introduction .................................................................................................. 5
G4 Camera Overview .................................................................................... 8
CCD and Camera Electronics ....................................................................... 11
CCD sensor .............................................................................................. 12
Model G4-9000 ................................................................................... 13
Model G4-16000 ................................................................................. 13
Camera Electronics .................................................................................. 13
Model G4-9000 ................................................................................... 14
Model G4-16000 ................................................................................. 14
Cooling and power supply ........................................................................... 15
Power supply ........................................................................................... 16
Mechanical Specifications ........................................................................... 19
Camera without filter wheel ................................................................... 20
Enhanced cooling variant ........................................................................ 21
Camera with “M” External filter wheel ................................................... 22
Enhanced cooling with External filter wheel variant .............................. 23
Optional accessories ................................................................................... 24
Telescope adapters ................................................................................. 24
Off-Axis Guider Adapter (OAG) ............................................................... 24
Attaching camera head to telescope mount ........................................... 25
Camera head color variants .................................................................... 26
Gx Camera Ethernet Adapter .................................................................. 27
Adjusting of the telescope adapter ............................................................. 28
Camera Maintenance .................................................................................. 31
Desiccant exchange ................................................................................. 31
Exchanging the silica-gel ..................................................................... 32
Desiccant containers for Standard cooling and Enhanced cooling
cameras ............................................................................................... 33
Changing the Telescope Adapter ............................................................ 34
Power Supply Fuse .................................................................................. 35
5
Introduction
Thank you for choosing the Moravian Instruments camera. The cooled G4
series Mark II CCD cameras were developed for imaging under extremely
low-light conditions in astronomy, microscopy and similar areas.
Design of this series inherits from earlier G4 Mark I cameras, but brings
some significant enhancements. G4 cameras employ precise electronics
providing uniform frames and extremely low read noise limited only by
CCD detector itself. G4 camera head is large enough to contain detector up
to 3737 mm in size.
Modular mechanical construction allows various camera variants to be
combined with rich set of accessories, including telescope adapters, offaxis guider adapters, external filter wheels (there are external filter wheels
with 5 or 7 positions for 5050 mm square filters available for G4
cameras), Ethernet adapters, guiding cameras etc.
Please note the internal filter wheel is not available for G4 cameras,
because a filter wheel capable to carry 550 mm square filters is too
big to fit inside camera head.
Rich software and driver support allows usage of G4 camera without
necessity to invest into any 3rd party software package thanks to included
free SIPS software package. However, ASCOM (for Windows) and INDI (for
Linux) drivers, shipped with the camera, provide the way to integrate G4
camera with vast variety of camera control programs.
The G4 cameras are designed to work in cooperation with a host Personal
Computer (PC). As opposite to digital still cameras, which are operated
independently on the computer, the scientific slow-scan, cooled cameras
usually require computer for operation control, image download,
processing and storage etc. To operate the camera, you need a computer
which:
1. Is compatible with a PC standard and runs modern 32 or 64-bit
Windows operating system.
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2. Is compatible with a PC standard and runs 32 or 64-bit Linux
operating system.
Drivers for 32-bit and 64-bit Linux systems are provided, but the
SIPS camera control and image processing software, supplied
with the camera, requires Windows operating system.
3. Support for x64 based Apple Macintosh computers is also
included.
Only certain software packages are currently supported on Mac.
G4 cameras require at last one free USB 2.0 port to communicate with a
host PC.
A simple and cheap device called “USB hub” can expand number of
available USB port. Typical USB hub occupies one computer USB port
and offers four or seven additional USB ports. Make sure the USB hub
is USB 2.0 high-speed compatible.
Alternatively, it is possible to use the “Gx Camera Ethernet Adapter”
device. This device can connect up to four Gx cameras of any type (not only
G4, but also G0, G1, G2 and G3) and offers 1 Gbps and 10/100 Mbps
Ethernet interface for direct connection to the host PC. Because the PC
then uses TCP/IP protocol to communicate with the cameras, it is possible
to insert WiFi adapter or other networking device to the communication
path.
Please note while the USB standard allows usage of cable no longer
than approx. 5 meters, the TCP/IP communication protocol used to
connect the camera over the Ethernet adapter is routable, so the
distance between camera setup and the host PC is virtually unlimited.
The G4 cameras need an external power supply to operate. It is not
possible to run the camera from the power lines provided by the USB
cable, which is common for webcams or very simple imagers. G4 cameras
integrate highly efficient CCD chip cooling, shutter and possibly filter
wheel, so their power requirements significantly exceed USB line power
capabilities. On the other side separate power source eliminates problems
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with voltage drop on long USB cables or with drawing of laptop batteries
etc.
Also note the camera must be connected to some optical system (e.g. the
telescope) to capture images. The camera is designed for long exposures,
necessary to acquire the light from faint objects. If you plan to use the
camera with the telescope, make sure the whole telescope/mount setup is
capable to track the target object smoothly during long exposures.
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G4 Camera Overview
G4 camera head is designed to be easily used with a set of accessories to
fulfil various observing needs. The cameras do not allow usage of internal
filter wheel as the large sensors require large 50×50 mm filters. External
filter wheel is then the only option for G4 camera.
There are two sizes of the External filter wheel available for the G4
cameras:
Medium “M” size wheel for 5 square filters 50×50 mm
Large “L” size wheel for 7 square filters 50×50 mm
Figure 1: G4 camera without filter wheel (left) and with "M" (center) and "L" (right)
External filter wheels
G4 camera heads are manufactured in two variants, differing in the cooling
performance:
Standard cooling
Enhanced cooling (11 mm thicker due to increased heat sink)
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Figure 2: Schematic diagram of G4 camera system components
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Components of G4 Camera system include:
1. G4 camera head with standard cooling
2. G4 camera head with Enhanced Cooling (EC) option
Both variants of camera head are capable to control the
External Filter Wheel
3. External Filter Wheel “M” size (5 positions)
4. External Filter Wheel “L” size (7 positions)
5. G0 Guider camera
6. G1 Guider camera
G0 and G1 cameras are completely independent devices with
their own USB connection to the host PC. They can be used
either on G2 OAG or on standalone guiding telescope.
Both G0 and G1 camera can share the Gx Camera Ethernet
Adapter with up to 3 other Gx cameras to be accessed over
network.
7. Canon EOS bayonet adapter for Canon compatible lenses
8. Off-Axis Guider with M68×1 thread adapter
9. 1.75” dovetail rail for G4 camera head
10. Gx Camera Ethernet Adapter (x86 CPU)
11. Gx Camera Ethernet Adapter (ARM CPU)
Camera Ethernet Adapter allows connection of up to 4 Gx
cameras of any type on the one side and 1 Gbps Ethernet on the
other side. This adapter allows access to connected Gx cameras
using routable TCP/IP protocol over practically unlimited
distance.
12. 5-positions “M” size filter wheel for 50×50 mm filters
13. 7-positions “L” size filter wheel for 50×50 mm filters
11
CCD and Camera Electronics
G4 series of CCD cameras are manufactured with “Full Frame” CCD sensors
manufactured by On Semiconductor (formerly Kodak).
Almost all Full Frame CCD detector area is exposed to light, which ensures
quantum efficiency provided but these sensors. Modern FF CCD detectors
are suitable also for scientific applications, even if equipped with so-called
Anti Blooming Gate (ABG – a gate, which prohibits blooming of the charge
to neighboring pixels when image is over-exposed) with linear enough
response to light within the full dynamic range.
Figure 3: “Full Frame” CCD schematic diagram
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G4 camera models:
Model G4-9000 G4-16000
CCD sensor KAF-09000 KAF-16803
Resolution 3056 × 3056 4096 × 4096
Pixel size 12 × 12 μm 9 × 9 μm
Sensor area 36.8 × 36.8 mm 36.9 × 36.9 mm
ABG Yes Yes
Color mask No No
CCD sensor
Quantum efficiency (sensitivity) of CCD detectors used in G4 cameras
depends on the particular camera model.
Figure 4: Quantum efficiency of CCD detectors used in G3 and G4 cameras
Inherent dark current of these detectors is quite low compared to other
CCD detectors, suitable for scientific applications, which results into very
good signal/noise ratio.
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Model G4-9000
G4-9000 uses 9 MPx CCD OnSemi KAF-09000.
Resolution 3056 × 3056 pixels
Pixel size 12 × 12 μm
Imaging area 36.8 × 36.8 mm
Full well capacity Approx. 110 000 eDark current 0.5 e-/s/pixel at 0°C
Dark signal doubling 7 °C
Model G4-16000
G4-16000 uses 16 MPx CCD OnSemi KAF-16803.
Resolution 3056 × 3056 pixels
Pixel size 9 × 9 μm
Imaging area 36.9 × 36.9 mm
Full well capacity Approx. 100 000 eDark current 0.3 e-/s/pixel at 0°C
Dark signal doubling 6.3 °C
Camera Electronics
16-bit A/D converter with correlated double sampling ensures high
dynamic range and CCD chip-limited readout noise. Fast USB interface
ensures image download time within seconds.
Maximum length of single USB cable is approx. 5 m. This length can be
extended to 10 m or 15 m by using single USB hub or active USB extender
cable. Up to 5 hubs or active extenders can be used in one connection.
Gx Camera Ethernet Adapter device allows connection of up to four Gx
cameras of any type through Ethernet interface and TCP/IP network.
Because TCP/IP protocol can be routed, the distance between camera and
host PC can be virtually unlimited.
ADC resolution 16 bits
Sampling method Correlated double sampling
Read modes Preview
Low-noise
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Horizontal binning 1 to 4 pixels
Vertical binning 1 to 4 pixels
Sub-frame readout Arbitrary sub-frame
Computer interface USB 2.0 high-speed
USB 1.1 full-speed compatible
Binning can be combined independently on both axes.
Image download time and system read noise depends on the CCD chip
used in particular camera model as well as on the camera read mode.
Preview read mode provides system read noise approx. 1 or 2 e-
above CCD chip read noise.
Low Noise read mode is somewhat slower, but ensures system
read noise roughly equal to the manufacturer-specified chip read
noise.
Model G4-9000
Gain 1.5 e-/ADU (1×1 binning)
1.7 e-/ADU (other binnings)
System read noise 10 e- RMS (Low noise)
11 e- RMS (Preview)
Download time 5.8 s (Low noise)
4.2 s (Preview)
Model G4-16000
Gain 1.6 e-/ADU (all binnings)
System read noise 11 e- RMS (Low noise)
12 e- RMS (Preview)
Download time 10.0 s (Low noise)
7.2 s (Preview)
Stated read noise is measured on particular CCD sensor, evaluated
during camera design. Actual read noise of different sensors varies
within sensor manufacturing batch and also among various
manufacturing batches. The camera read noise is determined by the
sensor itself and the camera manufacturer cannot affect it.
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Cooling and power supply
Regulated thermoelectric cooling is capable to cool down the CCD chip
from 42 to 47 °C below ambient temperature, depending on the camera
type. The Peltier hot side is cooled by fans. The CCD chip temperature is
regulated with ±0.1 °C precision. High temperature drop and precision
regulation ensure very low dark current for long exposures and allow
proper image calibration.
G4 cameras are available in two variants, differing in the cooling
performance:
Standard cooling cameras achieve regulated temperature
difference up to 42 °C below environment temperature.
Enhanced cooling cameras can regulate temperature up to 47 °C
below environment temperature. Compared to standard variant,
enhanced cooling cameras are somewhat bulkier due to bigger
heat sink, slightly heavier and somewhat noisier because of more
powerful fans.
Figure 5: Standard cooling camera (left) and Enhanced cooling model (right) with
thicker back shell containing larger heat sink
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The camera head contains two temperature sensors – the first sensor
measures directly the temperature of the CCD chip. The second one
measures the temperature inside the camera shell.
The cooling performance depends on the environmental conditions and
also on the power supply. If the power supply voltage drops below 12 V,
the maximum temperature drop is lower.
CCD chip cooling Thermoelectric (Peltier modules)
Standard cooling ΔT 47 °C below ambient maximum
42 °C below ambient typical
Enhanced cooling ΔT 50 °C below ambient maximum
45 °C below ambient typical
Regulation precision ±0.1 °C
Hot side cooling Forced air cooling (two fans)
Optional liquid coolant heat exchanger
Maximum temperature difference between CCD and ambient air may
be reached when the cooling runs at 100% power. However,
temperature cannot be regulated in such case, camera has no room
for lowering the CCD temperature when the ambient temperature
rises. Typical temperature drop can be achieved with cooling running
at approx. 85% power, which provides enough room for regulation.
Power supply
The 12 V DC power supply enables camera operation from arbitrary power
source including batteries, wall adapters etc. Universal 100-240 V AC/5060 Hz, 60 W “brick” adapter is supplied with the camera. Although the
camera power consumption does not exceed 55 W, the 60 W power supply
ensures noise-free operation.
Warning:
The power connector on the camera head uses center-plus pin.
Although all modern power supplies use this configuration, always
make sure the polarity is correct if other than the supplied power
source is used.
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Camera head supply 12 V DC
Camera head power consumption 15 W without cooling
52 W maximum cooling
Power connector 5.5/2.5 mm, center +
Adapter input voltage 100-240 V AC/50-60 Hz
Adapter output voltage 12 V DC/5 A
Adapter maximum power 60 W
Figure 6: 12 V DC/5 A power supply adapter for G4 camera
Power consumption is measured on the AC side of the supplied 12 V
AC/DC power supply. Camera consumes less energy from 12 V power
supply than state here.
The camera contains its own power supplies inside, so it can be
powered by unregulated 12 V DC power source – the input voltage can
be anywhere between 10 and 14 V. However, some parameters (like
cooling efficiency) can degrade if the supply drops below 12 V.
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G4 camera measures its input voltage and provides it to the control
software. Input voltage is displayed in the Cooling tab of the CCD
Camera control tool in the SIPS. This feature is important especially if
you power the camera from batteries.
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Mechanical Specifications
Compact and robust camera head measures only 154×154×65 mm (approx.
6×6×2.6 inches) for the model with standard cooling. Enhanced cooling
increases camera depth by 11 mm.
The head is CNC-machined from high-quality aluminum and black
anodized. The head itself contains USB-B (device) connector and 12 V DC
power plug, no other parts (CPU box, USB interface, etc.), except a “brick”
power supply, are necessary. Another connector allows control of optional
external filter wheel. Integrated mechanical shutter allows streak-free
image readout, as well as automatic dark frame exposures, which are
necessary for unattended, robotic setups.
Internal mechanical shutter Yes, blade shutter
Shortest exposure time 0.2 s
Longest exposure time Limited by chip saturation only
Head dimensions 154×154×65 mm (standard cooling)
154×154×76 mm (enhanced cooling)
Back focal distance 33.5 mm (base of adjustable adapters)
Standard cooling weight 1.6 kg (without filter wheel)
2.5 kg (with “M” External filter wheel)
2.8 kg (with “L” External filter wheel)
Enhanced cooling weight 1.8 kg (without filter wheel)
2.7 kg (with “M” External filter wheel)
3.0 kg (with “L” External filter wheel)
Back focus distance is measured from the sensor to the base on which
adjustable adapters are mounted. Various adapters then provide back
focal distance specific for the particular adapter type (e.g. Canon EOS
bayonet adapter back focal distance is 44 mm).
Stated back focal distance already calculates with glass permanently
placed in the optical path (e.g. optical window covering the CCD cold
chamber).
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Camera without filter wheel
Figure 7: G4 camera head front view dimensions
Figure 8: G4 camera head side view dimensions
21
Figure 9: G4 camera head bottom view dimensions
Enhanced cooling variant
Figure 10: G4 camera head with Enhanced cooling side view dimensions
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Camera with “L” External filter wheel
Figure 11: G4 camera head with External filter wheel front view dimensions
Figure 12: G4 camera head with External filter wheel side view dimensions
23
Figure 13: G4 camera head with External filter wheel bottom view dimensions
The “M” sized External Filter Wheel diameter is smaller (see External Filter
Wheel User's Guide), but the back focal distance of all external filter
wheels is identical.
Enhanced cooling with External filter wheel variant
Figure 14: G4 camera head with Enhanced cooling and External filter wheel side
view dimensions
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Optional accessories
Various accessories are offered with G4 Mark II cameras to enhance
functionality and help camera integration into imaging setups.
Telescope adapters
Usage of many common types of telescope and lens adapters are ruled out
by very large sensor used in G4 Mark II cameras. The CCD diagonal
dimension of G4 cameras is 52 mm, which is greater than outer dimensions
of many adapter kinds. Only the M68 threaded and Canon EOS bayonet
adapters are large enough not to cause vignetting.
M68×1 – adapter with M68×1 inner thread.
Canon EOS bayonet – standard Canon EOS lens adapter
(“L” size”). Adapter preserves 44 mm back focal distance.
Mark II adapters are attached either directly to the External filter wheel
front plate or to the adjustable adapter base mounted on the camera
head.
Off-Axis Guider Adapter (OAG)
G4 camera can be optionally equipped with Off-Axis Guider Adapter. This
adapter contains flat mirror, tilted by 45° to the optical axis. This mirror
reflects part of the incoming light into guider camera port. The mirror is
located far enough from the optical axis not to block light coming to the
main camera sensor, so the optics must be capable to create large enough
field of view to illuminate the tilted mirror.
25
Figure 15: OAG on G4 camera with thick adapter base
G4-OAG is manufactured with M68×1 thread with the back focal distance
61.5 mm.
If the OAG is used on camera without filter wheel, thicker adapter base
must be used to keep the Back focal distance and to allow the guiding
camera to reach focus.
OAG guider port is compatible with G0 and G1 cameras. It is necessary to replace
the CS/1.25” adapter with short, 10 mm variant in the case of G1 cameras. Because
G1 cameras follow CS-mount standard, (BFD 12.5 mm), any camera following this
standard with 10 mm long 1.25” adapter should work properly with the G4-OAG.
Attaching camera head to telescope mount
G4 camera heads are equipped with two “tripod” thread (0.25”) on the top
side. These threads can be used to attach 1.75 inch “dovetail bar” (Vixen
standard). It is then possible to attach the camera head, e.g. equipped with
26
photographic lens, directly to various telescope mounts supporting this
standard.
Figure 16: 1.75" bar for standard telescope mounts
Camera head color variants
Camera head is available in several color variants of the center plate. Visit
manufacturer's web pages for current offering.
Figure 17: G4 camera color variants
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Gx Camera Ethernet Adapter
Gx Camera Ethernet Adapter allows connection of up to 4 Gx cameras of
any type on the one side and 1 Gbps Ethernet on the other side. This
adapter allows access to connected Gx cameras using routable TCP/IP
protocol over practically unlimited distance.
Figure 18: The Gx Camera Ethernet Adapter with two connected cameras
28
Adjusting of the telescope adapter
All telescope/lens adapters of the G4 Mark II series of cameras can be
slightly tilted. This feature is introduced to compensate for possible
misalignments in perpendicularity of the telescope optical axis and sensor
plane.
Figure 19: Releasing of the “pushing” screw
The Mark II camera telescope adapters are attached using three “pulling”
screws. As the adapter tilt is adjustable, another three “pushing” screws
are intended to fix the adapter after some pulling screw is released to
adjust the tilt.
Warning:
Both pulling and pushing screws, used on the G4 camera adapter, are
fine-pitch M4×0.5 thread screws, not standard M4 thread ones. Always
use only screws supplied with the adapter, using of normal M4 screws
damages the adapter.
29
Because the necessity to adjust two screws (one pushing, one pulling) at
once is inconvenient, the adapter tilting mechanism is also equipped with
ring-shaped spring, which pushes the adapter out of the camera body. This
means the pushing screws can be released and still slight releasing of the
pulling screw means the distance between the adapter and the camera
body increases. The spring is designed to be strong enough to push the
camera head from the adapter (fixed on the telescope) regardless of the
camera orientation.
When all three pulling screws are fully tightened, releasing of just one
or two of these screws does not allow adapter to move, or at last only
very slightly thanks to deformation of the adapter body. If the adapter
has to be adjusted, it is necessary to slightly release all three pulling
screws, which makes room for tilt adjustment.
Figure 20: Adjusting of the "pulling" screw
Only after the proper tilt is reached, the pushing screws should be slightly
tightened to fix the adapter in the desired angle relative to camera head.
This ensures long-time stability of the adjusted adapter.
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Adjustable telescope/lens adapters are attached slightly differently
depending if the adapter is attached directly to the camera head (e.g.
when camera is equipped with internal filter wheel) or to the External filter
wheel case.
If the External filter wheel is used, the adapted base is not
necessary, as the Mark II External filter wheel front plate is
already designed to hold the spring and it also contains threads to
fix respective adapters.
G4 Mark II adapters are not mounted directly on the camera
head. Instead a tilting adapter base, holding the circular spring, is
always used.
Figure 21: Off Axis Guider adapter on the adapter base, attached to the G4 camera
without External filter wheel (left) and directly on the External filter wheel (right)
31
Camera Maintenance
The G4 camera is a precision optical and mechanical instrument, so it
should be handled with care. Camera should be protected from moisture
and dust. Always cover the telescope adapter when the camera is removed
from the telescope or put the whole camera into protective plastic bag.
Desiccant exchange
The G4 camera cooling is designed to be resistant to humidity inside the
CCD chamber. When the temperature decreases, the copper cold finger
crosses freezing point earlier than the CCD chip itself, so the water vapor
inside the CCD chamber freezes on the cold finger surface first. Although
this mechanism works very reliably in majority of cases, it has some
limitations, especially when the humidity level inside the CCD chamber is
high or the chip is cooled to very low temperatures.
This is why a cylindrical container, filled with silica-gel desiccant, is placed
inside the camera head. This cylindrical chamber is connected with the
insulated cooled CCD chamber itself.
Warning:
High level of moisture inside the CCD cold chamber can cause camera
malfunction or even damage to the CCD sensor. Even if the frost does
not create on the detector when the CCD is cooled below freezing
point, the moisture can be still present. It is necessary to keep the CCD
chamber interior dry by the regular exchange of the silica-gel
desiccant. The frequency of necessary silica-gel exchanges depends on
the camera usage. If the camera is used regularly, it is necessary to dry
the CCD chamber every few months.
It is possible dry the wet silica-gel by baking it in the oven (not the
microwave one!) to dry it again. Dry the silica-gel for at last one or two
hours at temperature between 120 and 140 °C.
The silica-gel used in G4 cameras changes its color according to amount of
absorbed water – it is bright yellow or orange when it is dry and turns to
32
transparent without any color hue when it becomes wet. It is
recommended to shorten replacement interval if the silica-gel is
completely transparent upon replacement. If it is still yellow-orange, it is
possible to prolong the replacement interval.
Figure 22: Silica-gel container is accessible from the camera back side
Exchanging the silica-gel
G4 Mark II cameras employ the same desiccant container like the G3 and
G2 cameras. The whole container can be unscrewed, so it is possible to
exchange silica-gel without the necessity to remove the camera from the
telescope.
Silica-gel is held inside the container with a perforated cap. This cap is also
screwed into the container body, so it is easy to exchange the silica-gel
inside the container after it is worn out or damaged e.g. by too high
temperature etc.
The container itself does not contain any sealing (the sealing remains
attached to the CCD cold chamber inside the camera head), it consists of
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aluminum parts only. So, it is possible to heat the whole container to
desired temperature without risking of the temperature-induced sealing
damage.
This design also allows usage of some optional parts:
Threaded hermetic cap, which allows sealing of the dried
container when it is not immediately attached to the camera
head.
Alternate (somewhat longer) desiccant container, modified to be
able to be screw in and tightened (as well as released and
screwed out) without any tool.
The sealing cap as well as the tool-less container are not supplied with
the camera, they are supplied only as optional accessory.
Figure 23: Optional cap, standard and tool-less container variants for both standard
cooling and enhanced cooling (prolonged) cameras
Desiccant containers for Standard cooling and Enhanced cooling
cameras
The difference between Standard and Enhanced cooling cameras is the
thickness of the camera back shell, containing heat sink. Naturally, the
silica-gel container of Enhanced cooling variants must be longer. Otherwise
the containers are the same and the longer variant can be used with
standard cooling cameras, it then only extends from the camera back.
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Changing the Telescope Adapter
All adapters of the Mark II cameras are attached using three “pulling”
screws. As the adapter tilt is adjustable, another three “pushing” screws
are intended to fix the adapter in place.
If the adapter has to be replaced for another one, it is necessary to
unscrew the three pulling screws. The adapter then can be removed and
replaced with another one.
Warning:
Both pulling and pushing screws, used on the G4 camera adapter, are
fine-pitch M4×0.5 thread screws, not standard M4 thread ones. Always
use only screws supplied with the adapter, using of normal M4 screws
damages the adapter.
Always make sure to carefully locate the ring-shaped spring prior to
attaching the adapter.
Figure 24: Replacing of the adjustable telescope adapter
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Power Supply Fuse
The power supply inside the camera is protected against connecting of
inverted-polarity power plug or against connecting of too-high DC voltage
(above 15 V) by a fuse. If such event happens and the cooling fans on the
back side of the camera do not work when the camera is connected to
proper power supply, return the camera to the service center for repair.
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