Not sure if I should post this on the beginners forum or here, but I think it might be more relevant here.
My equipment is very limited at the moment:
- Celestron Evolution 8 EdgeHD
- 2" ClickLock Visual Back
- 2" Diagonal with 1.25" adapter
- 20mm ES100 eyepiece
- The 40mm and 13mm Plossl eyepieces that came with the telescope
- 2.5x 2" Barlow with 1.25" adapter
I am thinking of getting one lower power 2" eyepiece, and maybe a higher power eyepiece. I was wondering if it is better (and cheaper) to buy one eyepiece and a focal reducer, or multiple eyepieces.
My first question is, would the 0.7x reducer work with my setup for visual use? From the white paper and the reducer manual, the 0.7x reducer would decrease the photographic back focus to 105mm for the 8". But the light path of my 2" diagonal alone is already 112mm. If the 0.7x reducer works for your 8" EdgeHD for visual use, what equipment (diagonal, eyepiece, visual back) are you using, and is there any effect to image quality?
Assume it works, then here are my pros and cons, but I am not sure if they are right or not.
- No need to get more eyepiece for different magnifications, as I can use a combination of barlow and reducer
- For a given wide AFOV, lower power eyepieces are generally more expensive
- I can try some astrophotography for now with the reducer (and get a wedge/EQ mount later)
- I am an OCD hoarder and would not sell anything unless I really have to. So I try to be a minimalist.
- Image quality might be compromised when using the reducer
- Clumsy setup
- For beginner level astrophotography, it is better to start with an EQ mount + 4" refractor, than to deal with 8" SCT + reducer + wedge/EQ mount + frustration
Thanks and clear skies!