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When I started I had to assemble my rig at the beginning of the evening and pack it all up in the morning. I ran into every possible problem under the sky.
"It worked yesterday, why is it not working today?" was the regular question at the beginning of the night. I learned that kikuyu lawn will make my telescope sink in messing up my polar alignment. Too much heating will make my images bad, too little too. The list is long. Now with a backyard observatory it is a lot easier.
The hardest problem for me was and is fixing backfocus and tilt. F/4.5 with a fullframe sensor and tiny 3.76 µm pixels reveals every error in my imaging train.
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