Has anyone tried the GSO 15mm or 20mm superview eyepiece in a F5 scope?
GSO 15mm and 20mm superview 1 1/4" eyepiece
Started by morsecode, 01/11/2007 02:17AM
Posted 01/11/2007 02:17AM
Opening Post
Posted 01/12/2007 02:23AM
#1
James,
I tried both these eyepieces when they first came out and wasn't impressed even at F15. If I recall images were kinda soft and not nice and crisp. I had pairs of each so I don't think it was just a bad sample.
I have a GSO 20mm on the shelf and just tried it out in a home-brew 80mm F5. The closest thing I had to compare it to is a 19mm Gary Russel wide field that I picked up new a couple of years ago for $45. It's pretty cloudy out here so all I could do was look around at some distant lights and a radio tower a few miles away. The 19mm was noticeably brighter and provided a much cleaner view. Images were soft only at the extreme edges. The 20mm showed soft images in the outer 30% of the field with extreme distortion at the edge. It was also a lot darker which seems very strange. I don't think you'll like it at F5. Also note that any dirt on the field lens of the GSO 20mm will show up badly as it is almost in focus.
good luck,
dan
I tried both these eyepieces when they first came out and wasn't impressed even at F15. If I recall images were kinda soft and not nice and crisp. I had pairs of each so I don't think it was just a bad sample.
I have a GSO 20mm on the shelf and just tried it out in a home-brew 80mm F5. The closest thing I had to compare it to is a 19mm Gary Russel wide field that I picked up new a couple of years ago for $45. It's pretty cloudy out here so all I could do was look around at some distant lights and a radio tower a few miles away. The 19mm was noticeably brighter and provided a much cleaner view. Images were soft only at the extreme edges. The 20mm showed soft images in the outer 30% of the field with extreme distortion at the edge. It was also a lot darker which seems very strange. I don't think you'll like it at F5. Also note that any dirt on the field lens of the GSO 20mm will show up badly as it is almost in focus.
good luck,
dan
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