Re: standing or sitting observating
A good observing chair is THE MOST valuable accessory you will ever own, used all the time every time you are at the EP, any EP any scope.
The 45 degree diagonal is used for terrestrial viewing and is not the best for star gazing, there are two mirrors joining creating a line in the center of the field of view. The 90 is best for star gazing and more comfortable.
I do not like zoom EPs because of the restricted field of view, I much prefer dedicated EPs with a wide field of view.
The most useful app I have found is Stellarium (free download to a mobile devise) and do not usually study ahead of time, I will refer to it as I observe in real time to help locate any object I am interested in.
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ACF 8"SCT,
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, Celestron C6A SCT,
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120, ES 102CF Apo triplet, ES AR102, ST100, ST90, Apex 90mm Mak, ST80, ETX60, Oberwerk 25x100s, 15x70s, 8x56s, Kasai 2.3x40s, Celestron AVX, CG4, SLT, LCM, Obie HD Parallel Bino mount, Canon T5, Meade DSI2 Pro, Phillips cam, Explore Scientific 30mm, 24mm, 18mm, 14mm, 11mm, 8.8mm, 6.7mm 82 degree EPs, ES 24mm, 20mm, 16mm 68 degree EPs, Baader 9mm Ortho, Meade 5000 SWA EP set, many more various EPs, Baader
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&SkyGlow, FringeKiller, SemiApo filters, Celestron UHC, Meade 4000 Nebular Filter, Kson OIII, DGM NPB and lots of astro stuff.