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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.
Note:
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 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 |
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.
Note:
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.
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 |
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.
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 |
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 |
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.
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