Archived posting to the Leica Users Group, 2010/03/05

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Subject: [Leica] 75 2.5
From: wildlightphoto at earthlink.net (Doug Herr)
Date: Fri, 5 Mar 2010 21:41:34 -0500 (EST)
 
Frank Filippone wrote:

>What I have always claimed... the rule of doubling.....
>
>15-35-75
>24-50-90
>Etc.....
>
>My buddy and I always used LF lenses in the doubling of FL .... anything 
>else seemed un-needed or could be worked around....

I like the rule of sqrt(2), i.e. 1.4x between focal lengths: 180-280-400-560

Doug Herr
Birdman of Sacramento
http://www.wildlightphoto.com
Replies: Reply from red735i at earthlink.net (Frank Filippone) ([Leica] 75 2.5)
Reply from richard at imagecraft.com (Richard Man) ([Leica] 75 2.5)
Reply from passaro.vince at gmail.com (Vince Passaro) ([Leica] 75 2.5)