QHYCCD QHY183 User manual

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GENERAL INFORMATION
The adapter system stated in this document is intended for the following model: (small to medium) sized cooled
CMOS camera, QHYOAG series, QHYCFW filter wheel series, A series integrated CCD camera。The legacy CCD
cameras (QHY23 and before) require custom adapters. Scientific grade camera usually involved custom adapter
solution, which is not included in this document.
Prior to your selection, there are few basic concepts:
1. Back focus distance: To simplified, this is the centered-focus distance of a lens or group of lenses. In camera
system, this is distance of which the focused image from the center of a lens or group of lenses projected onto
a film or sensor. In another word, this is the distance between the back of lens to the camera sensor. This
specification can usually be found on the lens or telescope. This is the most important specification for camera
to acquire a sharp image through an optical instrument.
2. How to reach the optimum back focus distance: In general, the back focused distance is a fixed specification.
The flange distance in conventional camera system is equivalent to back focus distance; for example, the modern
CANON DSLR EF lens system has a back focus of 44mm. Unlike the DSLR lens flange, the back-focus distance
of a telescope is not fixed and covers a range of distance. This is due to the differences of optical structure and
focusing system. Alternatively, if a flat field generator (flattener) is used in an Astro-Imaging chain, the back-
focus system of the flattener is used for determining the correct back focus distance.
To summarize, the correct telescope back focus distance (BF, and this is the distance behind focuser, flattener
and or other optical correctors) should be calculated per follow:
𝑀𝑎𝑥𝑖𝑚𝑢𝑚 𝑇𝑒𝑙𝑒𝑠𝑐𝑜𝑝𝑒 𝐵𝐹 ≤ 𝐶𝑎𝑚𝑒𝑟𝑎 𝐵𝐹 + 𝐹𝑖𝑙𝑡𝑒𝑟𝑤ℎ𝑒𝑒𝑙 𝐵𝐹 + 𝑂𝐴𝐺 𝐵𝐹 + 𝑎𝑑𝑎𝑝𝑡𝑒𝑟 𝐵𝐹
The following table includes the back-focused system consumed by respective the QHYCCD camera.
Name
Model
Back focus Consumed
Small sized
cooled Camera
QHY183、178、224、290、174
163、294*、550
10mm
(Not incl. adapter# 020085)
Medium sized
cooled camera
QHY128、168、247、367、268、600
18mm
(Not incl. adapter#020002）
* The QHY294 used a bigger housing body only and the adapter remain the same of small sized camera.
Name
Model
Back focus consumed
OAG
S/M/L
10mm
QHYCFW3
S
15.5mm/20mm
M
17mm/20.5mm
L
21.5mm
XL
21.5mm
3. The thread
M represent external thread, for example, M42 represents external thread of a radius of 42mm.
F represent internal thread, for example, M54 represents internal thread of a radius of 54mm.

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4. Back focus consumption: In this document all listed back focus consumption is de facto consumption
measurement rather than the measurement of the adapter.
5. Customized screws: Screws are required to mount the adapter otherwise the adapter is mount with threads. In
certain cases, tailored screws are required to fit the specific thickness of the system.
The table below listed all the adapters available in QHYCCD. Follows the table, there are few sample solutions:
Model
Illustration
Back focus
consumption
application
Where to acquire
020002
6mm
Tilt adjustment
Incl. in all medium camera
package
020010
27mm(2mm)
M42 to 1.25”
adapter
Incl. in all small camera
183/178/224/290/174
package
020011
32.5mm(2.5mm)
M42 to 2”
adapter
Incl. in small sized MFT
frame or bigger size sensor
camera
163/294/550 package
020028
32.5mm(2.5mm)
M54 to 2”
adapter
Incl. in all medium sized
camera
020055
2.5mm
Medium sized
camera connector
for mounted 2-
inch filter
Purchased separately
020056
3mm
Small sized
camera to M42
adapter
Purchased separately
020063
1mm
Small sized
camera to M54
adapter (screw
mount)
Purchased separately
020071
10mm
Medium sized
camera (M54) to
Canon EF mount
Purchased separately

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020072
10mm
Small sized
camera (M42) to
Canon EF mount
Purchased separately
020073
10mm
Medium sized
camera (M54) to
NIKON F mount
Purchased separately
020074
10mm
Small sized
camera (M42) to
NIKON F mount
Purchased separately
020076
020077
13.5mm
Medium adapter
for mounted IR
filter
Purchased separately
020078
020079
020080
020081
3mm
3mm
3mm
3mm
OAGM
Installation parts
（54mm\42mm
）
Incl. in OAGM package
020082
020083
3mm
3mm
OAGS installation
parts（42mm）
Incl in OAGS package
020084
——
Camera quick
mounting plate
Purchased separately

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020085
8mm
Standard external
mount in small
sized camera
Incl. in small sized camera
package
020088
14mm
Medium sized
camera back
focus adjustment
Purchased separately
020089
External mount
4mm
Fine adjustment
mount
0.5+1+2+3+7=13.
5mm
Medium sized
camera back
focus fine
adjustment
Purchased separately
020090
External mount
4mm
Fine adjustment
mount
0.5+1+2+3+7=13.
5mm
Small sized
camera back
focus fine
adjustment
Purchased separately

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GENEARL ILLUSTRAION FOR CONNECTING SMALL SIZED CAMERA TO THE IMAGING
Started from the camera, follows every solution to the end of the flow chart represents a compete connection behind
telescope. Back focus consumptions were in red. Please select carefully to match the optimal back focus distance of
your system.

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SCENARIO I ：SMALL SIZED CAMERA + TELESCOPE W/O CORRECTORS
This is the most basic solution and use the camera as is or as an EAA sensor. In this case the camera was used as an
eyepiece of either 1.25” or 2”. Most telescope has a tolerant range of back focus distance; a simple connection is
sufficient.
Model
Back focus
consumed
Where to acquire
Whether tailored
screws are needed
020010
M42 to 1.25”
or
020011
M42 to 2”
27mm(2mm)
Incl. in all small camera
183/178/224/290/174
package
NO
32.5mm(2.5mm)
Incl. in small sized MFT
frame or bigger size
sensor camera
163/294/550 package

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SCENARIO II ：SMALL SIZED CAMERA + CAMERA LENS/TELESCOPE WITH FLATTENER
As aforementioned, the back focus of DSLR lens is fixed. Therefore, the optimal back focus distance (OBFD) in such
setup must be met strictly. This is applicable to telescope flattener, which can be considered as a lens. The only
difference is the mounting method, bayonet mount for camera lens and regular threaded mount for flattener.
To reach the OBFD in such system, the fine adjustment adapters can be used: the 20090 (small size)/020089 (medium
sized) are comprised of 5 different pieces of adapter of 0.5/1/2/3/7mm respectively. They can be combined into
various thickness to meet specific demands. Tailored screw may require for the adapter(s).
While using the fine adjustment adapters in small sized camera, the external adapter (020085) needs to be replaced
by threaded external adapters (020056 and 020083). The 020083 is included in the standard package of small off
axis guider (OAGS)
Model
Back focus consumed
Where to acquire
Whether tailored
screws are needed
020056
3mm
Purchased separately
Likely
020083
3mm
Purchased separately
020090
External adapter 4mm；
Fine adjustment
adapters13.5mm
（0.5+1+2+3+7）
Purchased separately
020072/
020074
10mm
Purchased separately
（72 for CANON EF
MOUNT，74 FOR
NIKON F MOUNT）

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SCENARIO III : SMALL SIZED CAMERA + COLOR FILTER WHEEL
The small sized camera can be fitted with either smaller sized or medium sized color filter wheel (CFW). Please
choose one that is suitable for your system. CFW 2 and CFW 3 share the same connection method, in the following
demo, only CFW3 is shown.
The CFW can be threaded directly onto the camera without any extra adapters as shown per follow. Attention: the
CFW adapter does not add back focus length because the design is to let the top of cam (020085) plug into CFW,
the total length is 8mm still.
Alternatively, adapter 020063 can replace the original adapter in the original imaging chain. There are 2 major
advantage of such replacement. Firstly, it consumed less back focus. Secondly screws are used in fixing the CFW in
place, by which may reduce tiltness in the imaging chain. Such method requires minor works by opening the CFW
and removing the original adapter. Detail illustration can be found in the appendix.
Model
Back focus
consumed
Where to acquire
Whether tailored
screws are needed
020063
1mm
Purchased separately
No
One side of the filter wheel has matching threads for the camera respectively (M42 for small CFW, M54 for medium
CFW).

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SCENARIO IV: SMALL SIZED CAMERA + OAG
The following illustration is the recommended connection method for small sized camera + OAGS:
Model
Back focus
consumption
Where to acquire
Whether tailored screws are
needed
020082
020083
3mm
3mm
Incl in OAGS package
No (screws are incl. in the
OAG package)
020056
3mm
Purchased separately
We highly recommend matching size for OAG and camera. However, users may want to fully utilize idled equipment.
The following illustration is the recommended connection method for small sized camera + OAGM.
Model
Back focus
consumption
Where to acquire
Whether tailored
screws are needed
020081
020080
3mm
3mm
Incl in OAGM package
No (screws are incl.
in the OAG
package)
020056
3mm
Purchased separately

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Please refer to scenario I and II to add the OAG into the imaging chain for either telescope or camera lens. Also,
please ensure the 020082/020080 adapter install at the outer side of the OAG. They have the matching thread size
of the camera (M42 and M54 respectively).

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SCENARIO V SMALL SIZED CAMERA + CFW + OAG
OAGS connected with screws and external adapter is used (DO NOT INSTALL THE INTERNAL ADAPTER 020083).
ATTENTION: this combo CANNOT match DSLR Lens, because the length is too long for Canon/Nikon back focus.
Without OAG will be okay.
Small sized cams can connect CFWS+OAGS or CFWM+OAGM. The adapter used is a little different.
SMALL SIZED CAMERA + CFW S+ OAG
SMALL SIZED CAMERA + CFW M+ OAG

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GENEARL ILLUSTRAION FOR CONNECTING MEDIUM SIZED CAMERA TO THE IMAGING
Started from the camera, follows every solution to the end of the flow chart represents a compete connection behind
telescope. Back focus consumptions were in red. Please select carefully to match the optimal back focus distance of
your system.
Comparing to the small sized camera solutions, medium camera solutions are far less complicated. The explanations
are simplified, and similar connection can be referred back to the small camera solution as aforementioned.

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SCENARIO I MEDIUM SIZED CAMERA + TELESCOPE W/O CORRECTORS
Model
Back focus
consumption
Where to acquire
Whether tailored
screws are needed
020002
6mm
Incl. in all medium sized
camera package
No
020028
32.5mm(2.5mm)
Incl. in all medium sized
camera package
To install UV/IR cut filters adapter 020076 and 020077 are required.
Model
Back focus
consumption
Where to acquire
Whether tailored
screws are needed
020076 & 020077
13.5mm
Purchased separately
No

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SCENARIO II MEDIUM SIZED CAMERA + CAMERA LENS/TELESCOPE WITH FLATTENER
Model
Back focus consumption
Where to acquire
Whether tailored
screws are needed
020002
6mm
Incl. in all medium sized
camera package
Likely
020089
External adapter 4mm；
Fine adjustment
adapters13.5mm
（0.5+1+2+3+7）
Purchased separately
020088
14mm
Purchased separately
020055
2.5mm
Purchased separately
020073
OR
020074
10mm
Purchased separately（72
for CANON EF MOUNT，74
FOR NIKON F MOUNT）
If OBFD is not reached by adding the 13.5mm of the 020087, 020088 is recommended; In this case, 020055 is
required for installing UV/IR cut filter.

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SCENARIO III MEDIUM SIZED CAMERA + CFW
So far QHY600M is the only camera required large sized filter wheel (CFWL). QHY600 is the only monochrome
model camera in the medium sized camera category. Like small sized filter wheel (CFWS), the internal adapter of
CFWL needs to be removed and replaced with 020002 for screw mounting method. If the QHY600 and CFWL is
purchased in a package, the installation works will be performed in our manufacturing facility.
SCENARIO IV MEDIUM SIZED CAMERA + OAG
Medium sized camera can only be matched with medium sized OAG.
Model
Back focus
consumption
Where to
acquire
Whether tailored screws are
needed
020079
3mm
Incl in the
OAGM
package
No (the screws are included in the
package)

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SCENARIO V MEDIUM SIZED CAMERA + CFW + OAG
As aforementioned, QHY600M fits in such category, since it’s the only camera needs CFWL.
ATTENTION: this combo CANNOT match DSLR Lens, because the length is too long for Canon/Nikon back focus.
Without OAG will be okay.

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APENDIX REMOVING AND REPLACING THE INTERNAL ADAPTER OF CFW
When connect the camera with the CFW via 020056, 020063 OR 020002, the standard 2” adapter needs to be
removed and connect the camera with screws. The following illustration shows the replacing method:
REMOVAL OF THE 2” ADAPTER

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INSTALLATION OF 020056, 020063 or 020002