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Filters
When I started out observing in the early 60's with a small 50mm spectical blank single lens ( 1 diopter) refractor, cardboard tube Ex-Franks of Glasgow, it was recommended to use an 80a filter to see the GRS and belt details on Jupiter. I managed to convince myself that I COULD see some detail on the planet with such a set-up. Mind you the eyepiece was a small magnifying lens, certainly nothing like my plossls of today!!
Thinking back I could have saved thousands of dollars if I had stayed with that small homemade refractor..................
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