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HandyAndy
sage
Reged: 01/11/08
Posts: 444
Loc: West Midlands and around
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Re: The 'Best' telescope and eyepieces
07/03/08 06:58 PM
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Hi,
The off-axis spot diagrams are not very nice and by my criteria would need correction.
At F24 and not very large aperture they are perhaps not general purpose enough.
I do have a partly ground 5" F25 mirror for an off-axis scope as featured in S&T. It relies on the focal surface being within the coma free area of that mirror. The design used a spectacle lens as a corrector. The limit is 8".
For serious planetary observing, AKA EddieG, I think my Best Telescope needs to be at least a 6" Apo, 7" MN or 8" Newt. Can you show me an image or a spot diagram 20mm off-axis for an 8" Scheif? If the detectable image is fairly star shaped I will add it to the list.
Cheers. Andrew.
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Monarch 8x42, Zeiss 10x50 WA
10mm F2, Pentax 60mm F5
City: 7" MN78: MK4#2, 10" F6.3: MK4#1, 16" F5 ParaCorr
Country: 5" F9.5, 8" VISAC: GP2
Car: 6" F5 MPCC: SP, 5" 127mm F7.5
TV 55mm, Paragon 40mm, UO Pretoria 28mm
B&L 32 Pl, Clave's 25, 8, 6, 2x
Hyperions 5, 8, 13, 17, 24, 31
Nagler1 9mm, Meade 14mm 4000 UWA
Antares 1.6x, 0.7x, 0.5x
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