When is the best time for mars?
The 102 seems alot better than the 90. I know it shouldnt but maybe its the difference in glass? Im using the same diagonal because it is the only normal one i have .
I have looked at some cloudy looking spots near the milkyway. Maybe those are globular? Or nebula? They were about the same on the 102 and the dob. The 102 is exceptional in my opinion.
I was able to hook my dslr directly to the 102 and achieve focus and get pictures of the stars but really faint unfortunately
Im going to try prime and then eyepiece projection on the dob also.
Next optimal time I think is... 2025? So that may be a bit too long for you to wait for it... kind of a long, long night.
If you have a smartphone, download sky safari. Then simply choose compass, point at the sky and it'll tell you what everything is. You can also choose the best objects for the night/search.
I think your 90 is a Celestron 90GT F/10 and 102 is 102GT F/10, right? I wouldn't think there should be any difference besides the 102mm having a bit more light gathering + perhaps a teensy bit wider?
Maybe do a star test with the 90GT, check if it's in collimation. Also make sure the glass isn't dirty. For the dob, you probably know the drill by now -- center spot it, collimate it, star test... and should be good to go.
But for testing you want to pick the right targets and right magnifications. Such as if I test my dob on Venus vs a small mak/refractor on Venus, I may walk away thinking they are kind of the same. I'd see a bright object that has phases (was around half last time I checked). I wouldn't think one scope was much better than another.
Fainter DSOs should be visible in the dob, while probably hard to see at all in the refractor. Moon should show no CA.... allow higher mags. Not sure if you have the greatest high mag eyepieces though.
Edited by Anony, 29 May 2023 - 06:08 PM.