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#11
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Joe Miller wrote:
In article , "David J Taylor" [] A 24mm - 288mm (the same 12X zoom ratio) would be great, wouldn't it? Cheers, David The problem isn't necessarily the 12x zoom, it's the shortest focal length. [] One of my colleagues designs state-of-the-art lenses for his research. I'll run this by him for a more definitive answer. Joe Oh, I do appreciate the design difficulties - I was thinking how operationally useful a 24 - 288mm lens would be! You need to aim for f/2.8 or better to provide some depth-of-field limitation, and for reasons of diffraction f/8 is like to be the smallest aperture you would want. I'll be interested to hear what your colleague says. Cheers, David |
#12
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"David J Taylor" wrote in message . uk... Joe Miller wrote: In article , "David J Taylor" [] A 24mm - 288mm (the same 12X zoom ratio) would be great, wouldn't it? Cheers, David The problem isn't necessarily the 12x zoom, it's the shortest focal length. [] One of my colleagues designs state-of-the-art lenses for his research. I'll run this by him for a more definitive answer. Joe Oh, I do appreciate the design difficulties - I was thinking how operationally useful a 24 - 288mm lens would be! You need to aim for f/2.8 or better to provide some depth-of-field limitation, and for reasons of diffraction f/8 is like to be the smallest aperture you would want. I'll be interested to hear what your colleague says. I appreciate and I now have a better idea of the difficulties in designing a wide angle zoom. Just to add a personal note, I'd much rather have a 28mm (or better 24) equivalent than even a 200mm. -- James V. Silverton Potomac, Maryland, USA |
#13
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James Silverton wrote:
[] I appreciate and I now have a better idea of the difficulties in designing a wide angle zoom. Just to add a personal note, I'd much rather have a 28mm (or better 24) equivalent than even a 200mm. I've ended up with 24 - 432mm :-) but in two cameras :-( David |
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