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#302606 - 10/06/08 12:26 PM Re: Care of photographic equipment [Re: Peter Jones]
elbert Offline
the effect of focal length of a lens is relative to the size format.. on an 8x10
250 is wide.
very nice camera Dan. collectors dream


Edited by elbert (10/06/08 12:28 PM)
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#302612 - 10/06/08 01:15 PM Re: Care of photographic equipment [Re: Peter Jones]
Dan Carey Offline
Peter,
you're absolutely correct, the meanings of many photographic terms have become ambiguous over the years. A "wide angle" lens has a wider angle of view when compared to a normal lens. A normal lens is defined as a lens with a focal length equal to the film, or sensor, diagonal. That's about 43mm for 35mm cameras, 28mm for APS sized digicams or 300mm for an 8x10. The normal angle of view is about 53 degrees. On the 8x10 format a 10" lens has a slightly wider angle of view, something like a 24mm focal length on the APS format.

Dan




Originally Posted By: Peter Jones
250mm wide angle? These terms must have changed their meanings since.
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#302634 - 10/06/08 03:17 PM Re: Care of photographic equipment [Re: Dan Carey]
Peter Jones Offline
I did realise what Elbert said, but hadn't thought it through. Wouldn't it be far more useful if we measured a lens' "reach" by its angle of view?

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