I was able to get my EAA rig imaging the very first night out, but I did have an unexpected issue. My focal reducer is not acting as I would expect it to. When using SharpCap to plate solve, it gave me a focal ratio of f/7.2. That might not seem like much of a difference from f/6.3, but I could really notice it when comparing what I saw on my screen to the expected view with astronomy.tools FOA calculator. I used the back focal length for the Celestron FR (105mm) but I realize now that might be incorrect. There are several CN conversations that my Antares focal reducer has a back focal distance closer to 85mm. But from my understanding, having too much back focus should have made the effective reduction of my system even shorter than the listed x0.63 . Can you see any issue with my set up that would cause this? I want the full f/6.3. If this is as good as it gets, I might have to get a GSO x0.5 reducer.
- Celestron C5 spotting scope - f/10 1250mm FL
- Antares 0.63 reducer
- Celestron SCT T-adapter (50mm)
- ZWO T2-M48 extender (16.5mm)
- ZWO filter drawer w/ IR-UV cut filter (21mm)
- ZWO ASI533MC Pro (17.5mm)