I did calculations for 50mm at f/8 focused at 10 meters and 2 meters.
At 2 meters, after adjusting the aperture from f/8 to f/7.2 or 7.3 (I
don't remember which) the differences in near and far focus from the
Zeiss table were small enough that they would require close measurement
with a ruler. Perhaps they would be greater if I chose an even shorter
distance but I don't think you have any basis for claiming such unless
you also did the calculations for comparison against the Zeiss table.
Chuck Norcutt
On 11/29/2010 11:29 AM, Ken Norton wrote:
>> I think you're chasing a ghost. I had a look at the tables you linked
>> below and did some sample calculations for 50mm at f/8 using a
>> conventional DoF calculator. Those calculations don't agree with the
>> Zeiss cine lens table for 50mm but they're not far off.
>
> Well, it depends on what focus distance. At close focus, the
> differences can be significant, but at infinity or hyperfocal, the
> differences are essentially almost within the margin of error.
>
--
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