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[OM] Re: Choosing a mirror lens [was Firmware for Canon Printer]

Subject: [OM] Re: Choosing a mirror lens [was Firmware for Canon Printer]
From: Moose <olymoose@xxxxxxxxx>
Date: Mon, 19 Feb 2007 22:54:07 -0800
Jan Steinman wrote:
>> From: Moose <olymoose@xxxxxxxxx>
>>
>> Chuck has made some comments on DOF calculations. They dont' square  
>> with
>> my experience with mirror lenses. The issue is that most DOF  
>> calculation
>> assume a relatively modest magnification for viewing. With mirror
>> lenses, I find myself quite often cropping and blowing them up a lot
>> more. That results in shallower effective DOF.
>>     
>
> Keep in mind that DOF is affected by the aperture *and the FINAL  
> reproduction ratio.*
>   
What I was saying, but trying to avoid tech terms.

Moose

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