I re-did the spacing again and also this time used some strips of packaging tape to keep the elements from rotating while screwing on the cap. keeping 4 tiny little cut rectangles off a super thin plastic-paper thing I got off a bandaid wrapper. they are pretty thin and I dont see any rainbow-looking rings in the center of the objective. so the elements aren't touching.
though it was pretty hard to get them to be perfectly spaced out right at the edge of the lenses. hopefully not too much of an issue with 4 of them spaced around instead of 3 like i did before.
I tried with my camera again and all the corners are still severely blurred
Dont really think its over correction or under correction. because there is no point where the edges become even close to sharp. no matter what spacing i try.
hair-thin plastic-paper thing from a bandage wrapper. a single layer of duct tape. a single layer of packaging tape. or multiple layers. its all the same. I use tiny rectangles cut to the same size. it just gets worse the more spacing there is. but theres no point where it gets good at the center and edge at once
no spacing at all seems to be the closest i think. theres just a small concentric ring rainbow in the center of the lens with no spacing of the elements.
Center looks fairly sharp or at least decent. but edges look like a dump. Sad. all this effort and the edges still look poor.
Heres a screenshot.
Focus might be a fraction off. but thats nothing compared to the disgusting blur-mess of the edges! YUCK
With an eyepiece (From 6mm to 40mm) the image quality is pretty much perfect. negligible amount of chromatic aberrations. details razor-crisp sharp
Need to wear my glasses to even tell when using the 40mm eyepiece though. due to the enormous exit pupil magnifying my own eyes astigmatism.
with my glasses and 40mm eyepiece the image quality is near-perfect. I cant really detect any major faults. its pretty much crisp from center to edge evenly.
And with a 6mm eyepiece (with or without my glasses) it still looks acceptable. though quite a dark image. with a low-contrast look. however fine details look distinct and nearly at the limits of my vision. Actually i think the atmosphere is more of an issue than the telescopes optical quality in terms of sharpness. Crazy heatwave rippling on everything.