Archived posting to the Leica Users Group, 2001/02/08

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Subject: Re: [Leica] Re: DOF, thanks Austin
From: Johnny Deadman <>
Date: Thu, 08 Feb 2001 19:40:25 -0500

on 2/8/01 6:20 PM, Austin Franklin at wrote:

>> It is, moreover, TOTALLY standardized.
> Ah, that's why every resource cited gives a completely different DOF given
> the same criteria!
> It just isn't standardized.  Take two lenses from different manufacturers,
> or even different lenses from the same manufacturer with the same focal
> length...and the DOF scale will be different.  Here is an example of two
> 35mm format lenses:
> Leica 35/1.4 ASPH f16 is infinity to 3"
> Zeiss/Contax 35/1.4 f16 is infinity to 4"
> And that is just one example, that took no work to easily find, so don't
> tell me this is totally standardized.  If it is, obviously, either Zeiss or
> Leica doesn't pay attention to the supposed standard.

Okay, you got me. They use different magnification ratios. Big deal. My
point is that the FORMULA is standard. You choose the CoC that makes sense
for you. Here's a serious question, Austin.

Where would YOU put the f/16 lines on a 35/1.4 lens??
- -- 
Johnny Deadman