[pure-silver] Re: Depth of Field (35mm vs. 4x5 or 8x10)

Greetings ;
If we take 50 mm as being the 'Standard lens for 35mm ' then 100mm is 
double that length:
If we take 150mm as being the Standard lens for 4"x5"' then 300mm is double 
that length:
I believe we should compare 'Focal lengths'  NOT  Film area.
Cheers Barrie B.
At 10:48 AM 30/10/2004, you wrote:
>At 04:36 PM 10/29/2004, Gene Johnson wrote:
>
>
> >1600mm?  You sure about that Jim?  I was thinking more like 400.  He used a
> >100mm on his 35mm camera
>
>
>The 4x5 frame is roughly 16x the 35mm frame. This is all about image
>magnification. 16x 100 = 1600.
>
>But I could be wrong and would gladly accept another proof.
>
>Jim
>
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