[pure-silver] Re: Depth of Field (35mm vs. 4x5 or 8x10)
- From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
- To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
- Date: Sat, 30 Oct 2004 12:37:09 +0200
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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