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[OM] Re: Need help in the "Is There One Made" category

Subject: [OM] Re: Need help in the "Is There One Made" category
From: Jan Steinman <Jan@xxxxxxxxxxxxxx>
Date: Fri, 16 Feb 2007 23:38:10 -0800
> From: "Scott Peden" <scotpeden@xxxxxxxxxx>
>
> I'd be interested in seeing what you'd get with the OMZ  20mm in a  
> reverse
> macro set up, the grains in that slide ruler were beginning to look  
> pretty
> interesting.

I don't know why you'd want to reverse it, even if you could. When  
mounted properly, the nodal point is closer to the subject than the  
film plane, which is how it is designed. You reverse a non-macro lens  
because it is designed for the opposite case!

> From my tests, you'd have a 10mm wide picture that way.

I'm not sure how you can say this. There's no general way to tell  
that "lens X will have a field width of Y when mounted backwards."  
That all depends on the design of a particular lens.

The Zuiko 20/2 macro is very specialized for a reproduction ratio  
range of (I believe) 8:1 to 16:1. Reversing it isn't going to improve  
on that!

:::: Beware of the military-industrial complex. -- Dwight D. Eisenhower
:::: Jan Steinman <http://www.Bytesmiths.com>



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