TO EXPLORE THE UNKNOWN UNIVERSE
Imaging telescope: TS-Optics 200mm/8″ ONTC f/4 Newtonian (carbon tube)
Mount: Orion Atlas AZ/EQ Pro
Guiding Cameras: QHYCCD QHY5L-II M
| Model | Retail Price/USD | ||
| Combo A1 | 40 | Combo C1 | 40 |
| Combo A2 | 52 | Combo D1 | 40 |
| Combo A3
(10mm Nikon Adapter) |
35 | Combo D2 | 58 |
| Combo B1 | 35 | Combo D3 | 58 |
| Combo B2
(Canon Adapter) |
35 | Combo E1
|
35 |
| Combo B3
(12.5mm Nikon Adapter) |
40 | Combo F1 | 35 |
| M42 All-in-one Kit | 60 | ||
| M54 All-in-one Kit | 135 |
QHY offers a very comprehensive and flexible adapter system that allows our cameras to achieve focus with a variety of accessories, including camera lens adapters, off-axis guiders, filter wheels and numerous optical systems. The many potential combinations of these items produce an equal variety of back-focus distances that must be considered to make it all work together. This variety and flexibility, however, also can be confusing particularly for new users.
Therefore, based on users’ feedback we have decided to include a fixed combination of adapter kits to meet mainstream needs of most users (e.g., Multi-Purpose Coma Corrector, Canon lens adapter, Nikon lens adapter, etc.). Users can choose the corresponding adapter set according to their needs to ensure focus. There is no need to measure and calculate the back focal length, choose adapters, and customize screws as before. Now we directly provide the calculated results and corresponding adapters.
Back Focal Length (BFL), in the commercial camera field, refers to the design distance from the center of the rear lens element to the surface of the sensor. Generally, the lens will only focus correctly at infinity if the camera’s back focal length meets the standard requirements provided by the lens manufacturer. This is also true for many Multi-Purpose Coma Correctors designed to be used on telescopes before the camera.
| Optical system | Back focal length required |
| Typical Multi-Purpose Coma Corrector | 55mm – 57.5mm |
| Canon 35mm lens | 44.1mm |
| Nikon 35mm lens | 46.5mm |
When an optical system requires the sensor of the camera to be located at a specific distance from the last optical element, mechanical spacer adapters are used to position the camera at the right location. If the camera system also includes a filter wheel and an OAG, for example, between the camera and the telescope, the space required for these items must be taken into account. As a simplified explanation, for example, if a telescope’s field flattener requires the camera focal plane to be 55mm behind the last optical element, and the filter wheel is 20mm thick, and the OAG is 10mm thick and the sensor is set 10mm inside the camera then these items all take up 20+10+10=40mm of the back focal distance. Still, the camera needs to be 55mm away so we need to add spacers that take up this remaining 15mm. This also means that if you have an optical system that requires 55mm of backfocus distance and your filter wheel is 25mm thick and the OAG is 20mm thick and the sensor in the camera is 17mm from the front plate, then these items take up 25+20+17=62mm of backfocus. Too much! In this case something has to go to reduce the total back focus distance of the camera to 55mm or a different optical configuration must be found.
For the convenience of calculation, all the data displayed are the increase in the back focal length taken up by using the adapter, which is not necessarily equal to the thickness of the component itself. All the adapter data provided by QHYCCD are based on the focal length increment.
At present, our adapter combinations for monochrome cameras are based on the focal length of the following combinations, which are also our recommended combinations. If you use combinations other than those recommended, the adapter set may not achieve its purpose.
Note: If you do not want to use an OAG in the above combinations, we provide an additional 10mm spacer adapter in some kits to replace the OAG.
For cameras with a one-inch or smaller sensor (QHY183M/178/174/290), we recommend a combination of CFW3S-US + OAGS (optional);
| Model | BFL Consumed | Filters Supported |
| QHY183M/174M/550P | 17.5mm | 7 position
1.25inch mounted /31mm unmounted |
| CFW3S-US | 15.5mm | |
| OAGS | 10mm |
For cameras with a sensor larger than 1-inch and smaller than APS-C (QHY163m/294m) we recommend a combination of CFW3M (US) + OAGM (optional);
| Model | BFL Consumed | Filters Supported |
| QHY163M/294M | 17.5mm | 7 position
36mm unmounted |
| CFW3M-US | 17.5mm | |
| OAGM | 10mm |
Now we only have one APS-C Mono model—QHY268M.Fiirst there’s no doubt that 2-inch filters are large enough to cover the whole sensor area, but they’re not cheap enough. With a rough estimate, we think 36mm filter can be matched with scopes whose focal ratio are smaller than f/5 (f/4 worth a try, too). However, if your scope has a large focal ratio like f/2.8, we suggest you think carefully before using 36mm filters.
| Model | BFL Consumed | Filters Supported |
| QHY268M | 12.5mm | |
| CFW3M-US | 17.5mm | 7 position
36mm unmounted |
| CFW3L | 21.5mm | 7 position
2inch mounted/50mm unmounted |
| OAGM | 10mm |
Similarly, there’s only QHY600M as full frame mono CMOS camera. For QHY600, the best match is CFW3L and OAGM. If you have special requirement for short back focal length, like using Canon EF Lens (44.1mm BFL), Nikon F Lens (46.5mm), or using 55mm MPCC with both CFW and OAG, we recommend QHY600 Short BFL version as the only choice.
| Model | BFL Consumed | Filters Supported |
| QHY600M PH/Lite | 17.5mm | 7 position
2inch mounted/50mm unmounted |
| QHY600M SBFL | 12.5mm | |
| CFW3L | 21.5mm | |
| OAGM | 10mm |
Generally speaking, there’s no need for an OSC (one shot colored) camera to match filter wheel. If there’s any special needs, please refer to mono cam combos and choose the corresponding filter wheel. All OSC cams use OAG M if needed.
| Model | BFL Consumed |
| QHY183C/163C/294C | 17.5mm |
| QHY600C/268C/410C/367C/128C/247C/168C | 17.5mm+6mm (CAA) |
| OAGM | 10mm |
About IR-Cut filter：
The sealing glass of QHY OSC cameras whose format are above APS-C is AR glass instead of IR/Cut filter. That’s because when the sensor size is bigger, if IR/Cut is closed to sensor, it’s easy to cause haloing effect on image. We use IR/Cut filter as sealing glass on 4/3 format cameras or below, like 163C, 183C; as for big sensor OSC cams, such as 268C, 367C, we provide a special adapter for fixing 2-inch IR/Cut filter at a farther position from the sensor, or users can fix the filter inside the default T mount.
| Model | Inc. | Note | Retail Price/USD |
| Combo A1 | 5mm M54 to M48 Adapter*1
3mm Spacer*1 0.5mm Spacer*1 10mm Spacer*1
22mm M3 Screws*8 |
Standard accessory of QHY294M | 40 |
| Combo A2 | 10mm M54 Canon EF Adapter*1
4mm M54 Screwed Adapter*1 3mm Spacer*1 1mm Spacer*1 Cam Top Adapter (original name 020063)*1
10mm M3 Screws*8 |
_ | 52 |
| Combo A3
(Nik Adapter1) |
10mm M54 Nikon F Adapter*1 | _ | 35 |
| Combo B1 | 5mm M54 to M48 Adapter*1
3mm Spacer*3 1mm Spacer*1 10mm Spacer*1
24mm M3 Screws*8 28mm M3 Screws*8 |
Standard accessory of QHY268M\QHY600 Short BFL Ver. | 52 |
| Combo B2
(Can Adapter) |
10mm M54 Canon EF Adapter*1 | _ | 35 |
| Combo B3
(Nik Adapter2) |
12mm M54 Nikon F Adapter*1
0.5mm Spacer*1 |
_ | 40 |
| Combo C1 | 5mm M54 to M48 Adapter*1
7mm Spacer*1
14mm M3 Screws*8 |
Standard accessory of QHY600M-PH | 25 |
| Combo D1 | 5mm M54 to M48 Adapter*1
2.5mm 2inch Filter Fixer (Original Name 020055) 10mm Spacer*1 14mm Spacer*1
36mm M3 Screws*8
|
Standard accessory of QHY600C
QHY268C |
40 |
| Combo D2 | 10mm M54 Canon EF Adapter*1
4mm M54 Screwed Adapter*1 2.5mm 2inch Filter Fixer (Original Name 020055) 3mm Spacer*1 1mm Spacer*1
14mm M3 Screws*8 |
_ | 58 |
| Combo D3 | 10mm M54 Nikon F Adapter*1
4mm M54 Screwed Adapter*1 2.5mm 2inch Filter Fixer (Original Name 020055) 3mm Spacer*2 0.5mm Spacer*1
16mm M3 Screws*8 |
_ | 58 |
| Combo E1 | Under Developing | TBD | TBD |
| M42 All-in-one Kit
(Available Soon) |
8mm M42 to M48 Adapter*1
3mm M42 Screwed Adapter*1 Cam Top Adapter (original name 020063)*1
0.5mm/1mm/2mm/3mm/7mm/10mm Spacer*1
21mm M3 Screws*8 10mm M3 Screws*8 12mm M3 Screws*8 |
60 | |
| M54 All-in-one Kit
|
5mm M54 to M48 Adapter*1
3mm M54 to M42 Adapter*1 2.5mm 2inch Filter Fixer (Original Name 020055) *1 4mm M54 Screwed Adapter (Original name 020070)*1 Cam Top Adapter (original name 020063)*1 0.5mm/1mm/2mm/3mm/7mm/10mm/14mm Spacer*1
8mm M3 Screws*8 10mm M3 Screws*8 12mm M3 Screws*8 14mm M3 Screws*8 16mm M3 Screws*8 21mm M3 Screws*8 24mm M3 Screws*8 28mm M3 Screws*8 36mm M3 Screws*8 50mm M3 Screws*8 |
135 |
A1: Connecting MPCC that requires 55mm BFL and M48 interface to Camera with Filter Wheel and OAG
Note:
A2: Connect Canon lens with filter Wheel
Note: You need to remove the filter wheel and the original connection interface of the camera and replace it with a new adapter.
A3: Connect Nikon F Lens to Camera with Filter Wheel
First there’s no doubt that 2-inch filters are large enough to cover the whole sensor area, but they’re not cheap enough for everyone. With a rough estimate, we think 36mm filter can be matched with scopes whose focal ratio are smaller than f/5 (f/4 worths a try, too). However, if your scope has a large focal ratio like f/2.8, we suggest you think carefully before using 36mm filters.
| Model | BFL Consumed | Filters Supported |
| QHY268M | 12.5mm | |
| CFW3M-US | 17.5mm | 7 position
36mm unmounted |
| CFW3L | 21.5mm | 7 position
2inch mounted/50mm unmounted |
| OAGM | 10mm |
Note: Adapter Kits B1 is provided FOR FREE with each QHY268M model. B1,B2,B3,are suited for QHY268M; Adapter Kits D1 is provided FOR FREE with each QHY268C model. D1,D2,D3,are suited for QHY268C.
B1: Connecting MPCC that requires 55mm BFL and M48 interface to Camera with CFWL and OAG
Note:
B1: Connecting MPCC that requires 55mm BFL and M48 interface to Camera with CFW3M-US Only
B1: Connecting MPCC that requires 55mm BFL and M48 interface to Camera with CFWM-US and OAG
B2: Connect Canon EF lens to Camera with filter Wheel
B3: Connect Nikon F Lens to Camera with Filter Wheel
Note: The current Nikon adapter used here is different from the 10mm adapter we used to provide. Now it has a back focal length increment of 12mm.
C1: Connecting MPCC that requires 55mm BFL and M48 interface to Camera with CFW3L Only
Note: If you only use the filter wheel, the QHY600 standard version is enough to meet your needs. If you must use the CFWL and OAG at the same time, or use DSLR Lens, please choose QHY600 SBFL version.
Generally speaking, there’s no need for an OSC (one shot colored) camera to match filter wheel. If there’s any special needs, please refer to mono cam combos and choose the corresponding filter wheel. All OSC cams use OAG M if needed.
| Model | BFL Consumed |
| QHY600C/268C/410C/367C/128C/247C/168C | 17.5mm+6mm (CAA) |
| OAGM | 10mm |
*About IR-Cut filter：
The sealing glass of QHY OSC cameras whose format are above APS-C is AR glass instead of IR/Cut filter. That’s because when the sensor size is bigger, if IR/Cut is closed to sensor, it’s easy to cause haloing effect on image. We use IR/Cut filter as sealing glass on 4/3 format cameras or below, like 163C, 183C; as for big sensor OSC cams, such as 268C, 367C, we provide a special adapter for fixing 2-inch IR/Cut filter at a farther position from the sensor, or users can fix the filter inside the default T mount.
D1: Connecting MPCC with 55mm BFL and M48 interface
If you don’t use an OAG, please use 10mm adapter in the adapter kits to fill the original position of OAG.
D2: Connecting Canon EF Lens
Connecting Nikon F Lens
E1 is designed for QHY533C, 294C, 163C, 183C, 174C. Of course, if you use 163M/294M/183M/174M while a filter wheel or OAG is not needed, you can use E1 as well.
If all the existing package solutions cannot meet the demand, such as the situation where the BFL requirement is very special, we also offer this all-in-one accessory package which includes almost all kinds of M54 adapters we have. You can get any BFL you want through this kit.
Currently We only provide M42 All-in-one pack for QHY183M. Different from kits above, all adapters/spacers in this pack share M42 screws rather than M54. This kit ONLY suits the combo of QHY183M+CFW3S-US/CFW3S-SR+OAGS. Below lists some examples of using the kit (M42 Nikon/Canon adapter not included in this pack)
Note: this kit also suits other cameras with sensors one inch or smaller (e.g., QHY183/178/174/290).
If you need an adapter not listed on this page we closely work with our partner PreciseParts: All types of custom adapter can be designed online to assemble custom image trains using QHY cameras.
Click the logo or the link: https://www.preciseparts.com for more information!
