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[OM] Re: OM Teleconverter 1.4xA?

Subject: [OM] Re: OM Teleconverter 1.4xA?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sat, 17 Feb 2007 07:27:18 -0500
You're right.  Your real world check shows that I reported DOF as for 
the lens itself without considering the magnification of the TC.

Chuck Norcutt

Moose wrote:
> 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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