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[OM] Re: OM Teleconverter 1.4xA?

Subject: [OM] Re: OM Teleconverter 1.4xA?
From: Moose <olymoose@xxxxxxxxx>
Date: Fri, 16 Feb 2007 11:53:06 -0800
Chuck Norcutt wrote:
> Forgetting about the TC for a moment, a 500mm lens set at infinity but 
> on a 7mm extension tube should be focused at about 35 meters.  The depth 
> of field at f/8 and 35 meters is less than +/- 1.5 meters on either 
> side. 
The DOF is much less than that. All it takes is a look through the 
viewfinder to see that. My quick check for an 8x10 print shows TOTAL DOF 
of less than  1.4 m, or +/- .65 m. As a practical matter for the 
intended use, cropping/enlargement will generally be considerably 
greater than if printing the FF at 8x10 and the useful DOF for a first 
class image no more than a few inches.

Moose

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