Author Topic: 11.2 inch F/3.5 Jones ASC  (Read 62 times)


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11.2 inch F/3.5 Jones ASC
« on: December 27, 2017, 08:52:27 PM »
I was asked Preston to see if my design could be scaled up to fit his 13.25 inch BK7 blanks he has so this is what I came up with. I did put a curve on the flat side of the field lens (a stock lens) which makes it diffraction limited over the whole field at all wavelengths. I could have used another stock lens and left it flat but that left a little SA but is probably fine for AP. I made it a little faster at F.3.5 and covering a 35 mm frame and it still is all spherical. The lenses seem a bit thin though.Attached Thumbnails