Archived posting to the Leica Users Group, 2005/06/29

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Subject: [Leica] new Puts article
From: s.jessurun95 at chello.nl (animal)
Date: Wed Jun 29 12:49:00 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><9106DC64-0114-4457-9052-C94A20A8651F@earthlink.net><p06210201bee5ec472346@10.4.1.193><4cfa589b05062813165db77889@mail.gmail.com> <006f01c57ce2$27da53c0$3368010a@tci.toledoclinic.com>

http://www.imx.nl/photosite/comments/t001.html
explanation of the effect on perspective and dof
best,simon jessurun
----- Original Message ----- 
From: "Howard L Ritter, Jr" <hlritter@mindspring.com>
To: "Leica Users Group" <lug@leica-users.org>
Sent: Wednesday, June 29, 2005 9:38 PM
Subject: Re: [Leica] new Puts article


>I still believe that what I posted before is correct: If you take two 
>photos
> at the same f/ ratio, from the same distance, with different focal length
> lenses and different size sensors (or not, it doesn't matter), and then
> print both pictures scaled and cropped to show the same area and the same
> subject size, the pictures will look identical including the DOF.
>
> The photo taken with the shorter FL lens will have a smaller CoC on the
> sensor, but will have to be enlarged proportionally more to make the 
> subject
> the same size, offsetting the smaller CoC. The DoF with a smaller sensor 
> and
> shorter FL lens will be deeper only if the print is enlarged to the same
> _degree_ (e.g., 15 x the sensor size) not the same image scale (e.g.,
> subject's head 2" high), because the viewer will be looking at detail that
> appears smaller and not see unsharp focus as well.
>
> Same distance + same f/ ratio + same subject size on print = same DoF.
>
> --howard
>
> ----- Original Message ----- 
> From: "Adam Bridge" <abridge@gmail.com>
> To: "Leica Users Group" <lug@leica-users.org>
> Sent: Tuesday, June 28, 2005 4:16 PM
> Subject: Re: [Leica] new Puts article
>
>
>>I don't understand this, Henning.
>>
>> It seems to me that the depth of field is solely a fuction of the
>> geometry of the lens/film system. That the print and enlargement has
>> nothing to do with it.
>>
>> If I took an R8 with a 50 shot wide open at f1.4 I'd get some depth of
>> field. I replace the back with the DMR. Same shot. Same depth of field
>> but cropped.
>>
>> So then I open the images on photoshop and look at them. How does the
>> depth of field change?
>>
>> So I'm confused but I could certainly be enlightened! :)
>>
>> Adam
>>
>
>
> _______________________________________________
> Leica Users Group.
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In reply to: Message from s.jessurun95 at chello.nl (animal) ([Leica] new Puts article)
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