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

I'm with Gene on this one. The focal length ratio is equal to the frame
diagonal ratio, which is equal to the magnification ratio.

Consequently, a 400mm lens on a 4x5 camera is similar to a 100mm with a 35mm
format camera.





Regards



Ralph W. Lambrecht




On 10/30/04 2:48 AM, "Jim Brick" <jim@xxxxxxxxx> 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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