Archived posting to the Leica Users Group, 2005/06/25

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Subject: [Leica] new Puts article
From: feli2 at earthlink.net (feli)
Date: Sat Jun 25 11:26:55 2005
References: <001001c57926$037b5660$6452c33e@symke> <65280FBD-D7D0-4458-AEEC-1931718FBA6D@btinternet.com> <9b678e050625054040fb9bc9@mail.gmail.com> <42BD59D7.7000409@arbos.net> <42BD6293.4000507@adrenaline.com> <13786F32-A906-4316-9F77-37E76DE5BB7B@earthlink.net> <4cfa589b0506251001a82d9b@mail.gmail.com>
 
On Jun 25, 2005, at 10:01 AM, Adam Bridge wrote:

> Wait a minute now. For a given lens the DOF is independent of the
> cropping factor of the sensor, right? So if you use existing M lenses
> on a digital M with an APS or somesuch chip then the depth of field
> will be the same for a given f-stop but the crop factor will still be
> in play.

You are correct. A 50 on a full frame has the same DOF as a 50 on a  
APS (x1.5)
size sensor. It's the field of view that is cropped. So, with a x1.5  
mag factor your
50 shows the field of view of a 75, but has the DOF of a 50, which is  
not as shallow
as a true 75 on a full frame system.

If I wanted the FOV of a 50 on my APS (x1.5) camera I would have use  
a 35 (35x 1.5 = 52.5).
But I would still have the DOF characteristics of the 35.

Feli



________________________________________________________
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