Can anyone steer me in the propular attach to a Svbony SV550 122mm EDT with reducer/flattener. How do i acchieve the 55mm back focus.
Back Focus Svbony SV550 122 EDT
Which field flattener are you using?
You only need the adapter that came with your refractor and add the correct spacers behind. If your camera's focal flange distance (FFD) is 18mm (ZWO and QHY are usually both 17.5mm), then you substract this lenght to the 55mm (55 - 18 = 37mm) so you need to add 37mm of spacers. This can include an off-axis guider, a filter wheel or simply spacers as long as the total lenght including your camera FFD doesn't exceed 55mm. If you are using a DSLR or mirrorless, then the T-ring count also as it is external.
https://astrob.in/full/mh3u4e/0/?real=
Hope this help.
Fred
https://astrob.in/full/mh3u4e/0/?real=
Hope this help.
Fred
Helpful Concise
Measure 55mm from back of the reducer to the camera sensor.
On my camera you need 55mm - 17.5mm = 37.5mm in 42mm/48mm diam spacers (or less if you have a filter holder, usually 21mm).
https://www.youtube.com/watch?v=S45fOHFYtTE
https://www.youtube.com/watch?v=ZAIsEXGATWk
https://www.youtube.com/watch?v=D_85aN6ddWA
https://www.youtube.com/watch?v=0Oqvk5U5gWw
https://www.youtube.com/watch?v=p6O4EX56wFo
https://www.astrobin.com/search/?q=122mm+Hamber
On my camera you need 55mm - 17.5mm = 37.5mm in 42mm/48mm diam spacers (or less if you have a filter holder, usually 21mm).
https://www.youtube.com/watch?v=S45fOHFYtTE
https://www.youtube.com/watch?v=ZAIsEXGATWk
https://www.youtube.com/watch?v=D_85aN6ddWA
https://www.youtube.com/watch?v=0Oqvk5U5gWw
https://www.youtube.com/watch?v=p6O4EX56wFo
https://www.astrobin.com/search/?q=122mm+Hamber
Concise