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Mark9473
Post Laureate
Reged: 07/21/05
Posts: 3436
Loc: 51°N 4°E
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Re: Zoom binos
08/13/08 04:15 AM
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Great idea indeed, but generally very poor optical quality.
Regular fixed-power binoculars are already an optical compromise: two very fast achromatic 'telescopes', two sets of prisms, two eyepieces, and all this often for a really low price (like your example shows). Think about what you'd spend on a single telescope objective or diagonal or eyepiece.
With zoom binoculars, the additional optical compromises to make it a zoom really take a heavy toll on the performance.
Let's be realistic, $139 is less than you'd espect to spend on a single good zoom eyepiece for a telescope.
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Mark
Leica 8x20; Nikon 7x35; Vixen 8x42; Swift 8.5x44, 10x50 and 20x80; TS 7x50; Orion 15x63; Docter 15x60
WO Megrez II 80 FD
APM 107mm f/6.5 on GR3-DX
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