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Re: [OM] Photos from Bessa

Subject: Re: [OM] Photos from Bessa
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Thu, 22 Jan 2009 08:28:10 -0500
Some careful tests with camera on tripod and fixed target may be in 
order but I wouldn't worry about it too much just yet.  You're talking 
about an error of maybe 4" which is certainly quite possible just in 
small body and head movements between you and subject.

In the photo of your son I estimate the distance to be between 4 and 5 
feet.  Taking 4 feet as the the most stringent from a depth of field 
standpoint, the DOF at 35mm and f/5.6 is about 18" arranged 7-1/2" in 
front of and 10-1/2" behind the point of best focus.  So, even on a 
largish print a 4" backfocusing error from the eyes shouldn't be 
noticeable as all parts of the head from tip of the nose to back of the 
head should still be in good focus.  The same focusing error would 
likely be covered even at f/4 from 4 feet but starting to get dicey at 
f/2.8.

Dr. Focus

Chris Crawford wrote:
> I finally scanned some photos from the Bessa R2 I was given. I'm
> dissapointed. Looked at large on screen, the images look backfocused a few
> inches, making the sharpest area the hair on the side of the head on the two
> portraits I've posted, rather than they eyes I actually focused on. You
> can't really see that in the small images posted on my website:
> 
> http://www.chriscrawfordphoto.com/family-snapshots/bessa/
> 
> You can see the nice bokeh, and nice tonality. The images overall look
> beautiful but the focus issue bothers me. Tomorrow I am going to shoot some
> careful tests to see if the camera's focus is off. I may have to have it
> repaired :( :(
> 
> 
-- 
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