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GlennLeDrew
professor emeritus
Reged: 06/18/08
Posts: 703
Loc: Ottawa, Ontario, Canada
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Re: Saturn IIIs on the way!
06/30/08 06:22 PM
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In the Chinese-made RA-88's and -70's, the focus is so close to the optical window immediately behind the last prism face that the eyepieces for these instruments must have their field stops right at the very bottom of the barrels. If *any* dust settles on the windows, it's almost surprisingly sharply visible, due to the small distance from the image plane.
If one wanted to use a 1.25" eyepiece (which would have to have its barrel "padded" so as to fit more snugly), the barrel might have to be cut shorter so that the field stop is at the very lip.
I wonder how the Miyauchi's fare in this area?
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Home-made 11X50 right angle bino, 8.1 deg. FOV
Modified 26X100 bino, 3.5 deg. FOV
Mediocre minds discuss people. Good minds discuss events. Great minds discuss ideas.
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