[Leica] M8 & Depth of Field

[jhnichols at bellsouth.net (Jim Nichols)]

Didier,

Could it be that the lens you chose is much sharper in the center than at 
the edges?  This could lead to the appearance of a sharper image with the 
digital format, because the less sharp edges were missing.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Didier Ludwig" <rangefinder@screengang.com>
To: "Leica Users Group" <lug@leica-users.org>
Sent: Wednesday, November 01, 2006 2:57 AM
Subject: Re: [Leica] M8 & Depth of Field


> Hi Wai Leong
>
> I'm not shure about that. Yes, the DOF marks on the lenses are no longer 
> correct when used with a M8 - but the other way round. I don't make any 
> calculations - am not really interested in the mathematical aspects of 
> photography - but a few months ago I did just a few empiric tests with the 
> same 50mm/1.2 lens wide open on a M6 and a R-D1 (with it's crop factor of 
> 1,5). It seems to be the opposite - on the R-D1 shots there was visibly 
> more DOF. Same lens/smaller format = MORE DOF.
>
> It is my general experience that the bigger the formats get, the narrower 
> the DOF is with the same focal length/aperture. On 6x6 negatives with 
> 100/f2.8, I have a DOF about as narrow as with 50/f1.4 on small format. 
> But as said, these are no academic calculations, just estimations out of 
> my modest experiences.
>
> Didier
>
>
>
>
>
>
>>Since d is smaller for a digital sensor that is less than 24x36 mm, it is 
>>clear that a 35 mm lens used with a digital sensor must have a smaller DOF 
>>at all distances.
>
>
>
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>
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