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HandyAndy
sage
Reged: 01/11/08
Posts: 412
Loc: West Midlands and around
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Re: The 'Best' telescope and eyepieces
07/03/08 07:36 PM
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Hi,
I count a single lens or corrector plate as one surface compared to a mirror.
A reflection doubles the surface error but a mirror only has one surface to figure.
A refraction has about half the surface error but there are two surfaces so nets out at about the surface error but there are two surfaces to figure.
Yes we are not worried about cosmetics.
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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