How Good Are ED-APO Telescopes for Imaging?
Posted 29 August 2020 - 12:23 PM
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- BruceNewEngland likes this
Posted 29 August 2020 - 09:26 PM
Remarkable and thoughtful work. I greatly appreciate the time and effort you put into this project. I will be keeping this in mind as I consider ED vs. APO for my next scope purchase.
Posted 06 September 2020 - 08:33 PM
A most interesting comparison in actual results - especially since I have an APM152ED and a 102ed (F-11) . It seems to show the effects of aperture also separately with the effects of refraction compared to reflection. The little 102mm doesn't seem to have the resolution/tighterspot performance of the larger diameter objectives. Not really a concern for wider field imaging, but obvious when pushing resolution to the seeing limits. In pushing the limits of resolution both aperture and objective quality would seem to stand out. A direct comparison between the 152 doublet ed and a 152 triplet would be interesting on these same objects.
Posted 16 September 2020 - 07:47 PM
Excellent work Tom, It’ll help inform my next purchase.