[LRflex] Re: Angle of View table
- From: Thomas Schofield <tdschofield@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Fri, 25 Jan 2008 21:23:49 -0800 (PST)
Perhaps the R10 will have a magnification factor
instead of a crop factor ;-). Maybe "oversized
sensor" means a 4x5 ratio within the same image
circle -- wouldn't that have a longer diagonal length
than a 2x3 ratio, or is my geometry off?
Tom Schofield
--- wildlightphoto@xxxxxxxxxxxxx wrote:
> Herewith a handy diagonal Angle of View (AV) table
> for several popular focal lengths on a 35mm film
> camera (lens focussed at infinity). The AV is
> approximate because actual focal lengths often
> deviate somewhat from nominal.
>
> 15mm lens = AV-110
> 19mm lens = AV-95.7
> 21mm lens = AV-92
> 24mm lens = AV-84
> 28mm lens = AV-76
> 35mm lens = AV-64
> 50mm lens = AV-45
> 60mm lens = AV-40
> 80mm lens = AV-29
> 90mm lens = AV-27
> 100mm lens = AV-22.5
> 180mm lens = AV-14
> 200mm lens = AV-12.5
> 250mm lens = AV-10
> 280mm lens = AV-8.8
> 400mm lens = AV-6
> 560mm lens = AV-4.4
>
> For a smaller format, divide the above AV values by
> the crop factor, i.e.,
> for the 60mm Macro-Elmarit-R on the DMR the AV is
> 40/1.37 = about 29
>
>
> Doug Herr
> Birdman of Sacramento
> http://www.wildlightphoto.com
>
>
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