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 |

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 020089, 020088 is recommended; In this case, 020055 is required for installing UV/IR cut filter.

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) |

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.
Conclusion
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.