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www.qhyccd.com 

 
 

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 

15.5mm/20mm 

17mm/20.5mm 

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. 

Содержание QHY128

Страница 1: ...e 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 co...

Страница 2: ... 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...

Страница 3: ... 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 ...

Страница 4: ...um 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 ...

Страница 5: ...D 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 ...

Страница 6: ...epiece 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 ...

Страница 7: ...ed 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 ...

Страница 8: ...p 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 removi...

Страница 9: ...ge 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...

Страница 10: ...io 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 ...

Страница 11: ... 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 ...

Страница 12: ...ts 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 ...

Страница 13: ...ilored 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 ...

Страница 14: ...mera 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 cu...

Страница 15: ...pter 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 i...

Страница 16: ...M 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 ...

Страница 17: ... 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 ...

Страница 18: ...18 www qhyccd com INSTALLATION OF 020056 020063 or 020002 ...

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