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DAVIDG
Carpal Tunnel
Reged: 12/02/04
Posts: 1538
Loc: Hockessin, De
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Re: The 'Best' telescope and eyepieces
07/05/08 10:20 AM Attachment (13 downloads)
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Here is a spot diagram of 9 1/2" f/12 Schpumann I'm building now. Note that it is diffraction limited out to 0.4 degrees and has a polychromatic Strehl of 0.997 which means all the colors are inside the airy disk across the 0.4 dgree field of view. Schupmanns also have the ablity to correct for color dispersion introduced by the atmosphere so one can achieve a color free image of even when the objects are low in the sky.
- Dave
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Homemade 'scopes 8"f/7,6" f/5", 6"f/4, 4.25" Schief. 60mm Coronagraph,60mm H-alpha system, 4.25" White-light Solar Newtonian,solar spectroscope, 4.5" f/16 Schupmann Medial refractor, 14 Stellafane awards 7 in optics
Engineering = Taking what you have and making what you need.
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