Re: [OM] Doing the Splits (I concur)

[Chuck Norcutt]

My point was that even a 30x40 print at 300 dpi would not show a 
difference in focus between 5 and 6 meters using a 21mm lens even at 
f/2.  That being the case he can't "prove" with a real photograph that 
he could see the difference in the viewfinder... whether he can or not.

Chuck Norcutt


Ken Norton wrote:
>> Unfortunately you'll never be able to demonstrate that assertion
>> photographically.  Even at a resolution of 135 line pairs/mm (more than
>> 4 times what's required for a good 8x10" print) the DoF for a 21mm lens
>> at f/2 when focused at 5 meters still reaches to 6 meters.
> 
> I think I did. Just because the DoF may "cover" both lengths, with a
> gentle rocking back and forth you are able to ascertain a mid-point.
> 
> AG
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