Table of Contents
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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:
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The following table includes the back-focused system consumed by respective the QHYCCD camera.
Name
Small sized
cooled Camera
Medium sized
cooled camera
* The QHY294 used a bigger housing body only and the adapter remain the same of small sized camera.
Name
OAG
QHYCFW3
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.
Model
QHY183、178、224、290、174
163、294*、550
QHY128、168、247、367、268、600
Model
S/M/L
S
M
L
XL
www.qhyccd.com
Back focus Consumed
10mm
(Not incl. adapter# 020085)
18mm
(Not incl. adapter#020002）
Back focus consumed
10mm
15.5mm/20mm
17mm/20.5mm
21.5mm
21.5mm
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Table of Contents
Related Manuals for QHYCCD QHY183
Summary of Contents for QHYCCD QHY183
- Page 1 �������������� ������������������ ���� ≤ ������������ ���� + ��������������ℎ������ ���� + ������ ���� + �������������� ���� The following table includes the back-focused system consumed by respective the QHYCCD camera. Name Model...
- Page 2 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: Back focus...
- Page 3 020076 13.5mm for mounted IR Purchased separately 020077 filter 020078 OAGM 020079 Installation parts Incl. in OAGM package 020080 （54mm\42mm 020081 ） 020082 OAGS installation Incl in OAGS package 020083 parts（42mm） Camera quick 020084 —— Purchased separately mounting plate www.qhyccd.com...
- Page 4 14mm camera back Purchased separately focus adjustment External mount Medium sized camera back 020089 Fine adjustment Purchased separately focus fine mount adjustment 0.5+1+2+3+7=13. External mount Small sized camera back 020090 Fine adjustment Purchased separately focus fine mount adjustment 0.5+1+2+3+7=13. www.qhyccd.com...
- Page 5 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. www.qhyccd.com...
- Page 6 Whether tailored Model Where to acquire consumed screws are needed Incl. in all small camera 020010 M42 to 1.25” 27mm(2mm) 183/178/224/290/174 package Incl. in small sized MFT frame or bigger size 32.5mm(2.5mm) 020011 sensor camera M42 to 2” 163/294/550 package www.qhyccd.com...
- Page 7 Back focus consumed Where to acquire screws are needed 020056 Purchased separately 020083 Purchased separately External adapter 4mm； Fine adjustment 020090 Purchased separately adapters13.5mm Likely （0.5+1+2+3+7） Purchased separately 020072/ （72 for CANON EF 10mm 020074 MOUNT，74 FOR NIKON F MOUNT） www.qhyccd.com...
- Page 8 Detail illustration can be found in the appendix. Back focus Whether tailored Model Where to acquire consumed screws are needed 020063 Purchased separately One side of the filter wheel has matching threads for the camera respectively (M42 for small CFW, M54 for medium CFW). www.qhyccd.com...
- Page 9 The following illustration is the recommended connection method for small sized camera + OAGM. Back focus Whether tailored Model Where to acquire consumption screws are needed 020081 Incl in OAGM package No (screws are incl. 020080 in the OAG package) 020056 Purchased separately www.qhyccd.com...
- Page 10 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). www.qhyccd.com...
- Page 11 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 www.qhyccd.com...
- Page 12 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. www.qhyccd.com...
- Page 13 Incl. in all medium sized 020028 32.5mm(2.5mm) camera package To install UV/IR cut filters adapter 020076 and 020077 are required. Back focus Whether tailored Model Where to acquire consumption screws are needed 020076 & 020077 13.5mm Purchased separately www.qhyccd.com...
- Page 14 020073 Purchased separately（72 10mm for CANON EF MOUNT，74 020074 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. www.qhyccd.com...
- Page 15 SCENARIO IV MEDIUM SIZED CAMERA + OAG Medium sized camera can only be matched with medium sized OAG. Back focus Where to Whether tailored screws are Model consumption acquire needed Incl in the No (the screws are included in the 020079 OAGM package) package www.qhyccd.com...
- Page 16 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. www.qhyccd.com...
- Page 17 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 www.qhyccd.com...
- Page 18 INSTALLATION OF 020056, 020063 or 020002 www.qhyccd.com...