What is the main purpose of the QHYCCD Adapter Kit - Combo D1?
The primary purpose of the QHYCCD Adapter Kit - Combo D1 is to connect one of the QHYCCD color cameras it is listed for to a corrector that needs 55mm back focus and M48 threads, such as a multi-purpose coma corrector. This ensures optimal optical correction and sharp stars across your entire image sensor.
Why is correct back focus so critical for imaging with the QHYCCD Combo D1 kit?
Correct back focus is essential because optical correctors (flatteners, reducers, coma correctors) are designed to work at a specific distance from the sensor. If the spacing is incorrect, you will see optical aberrations, most commonly seen as elongated or misshapen stars in the corners and edges of your photographs. The Combo D1 kit provides the tools to set this distance accurately.
How do I use the QHYCCD Adapter Kit - Combo D1 to get 55mm of back focus for my coma corrector?
On the color cameras it is listed for, the camera body and its CAA consume 17.5mm + 6mm. The Combo D1 parts (5mm M54 to M48 adapter, 2.5mm filter fixer, 10mm and 14mm spacers) add the rest, so the train ends in M48 threads at 55mm.
I have a QHYCCD camera, a filter wheel, and an OAG. Can the Combo D1 kit connect them all?
Not as a filter wheel set. QHYCCD designs Combo D1 to connect a color camera (with its 6mm CAA) and an optional OAGM to a corrector that needs 55mm back focus and M48 threads. For a filter wheel, QHYCCD refers you to the combinations for the matching mono camera.
Will the QHYCCD Combo D1 kit work with non-QHYCCD accessories?
With the QHYCCD color cameras it is listed for, Combo D1 ends in M48 threads through its 5mm M54 to M48 adapter, so it connects to a corrector with an M48 thread that needs 55mm back focus, such as a typical multi-purpose coma corrector. The spacers themselves use QHYCCD's 6-screw and spacer adapter system.
Can using the QHYCCD Adapter Kit - Combo D1 help reduce tilt in my imaging train?
Yes. A major benefit of using a dedicated adapter kit like the Combo D1 is that it relies on QHYCCD's 6-screw and spacer system instead of compression rings or push-fit adapters. This system is more robust than a typical threaded connection, keeping the imaging train stable and square, significantly reducing the chances of sensor tilt which can ruin image sharpness in one or more corners.
