Archived posting to the Leica Users Group, 2011/11/03

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Subject: [Leica] 1.8 vs. 1.4!?!?
From: imagist3 at mac.com (George Lottermoser)
Date: Thu, 03 Nov 2011 13:31:28 -0500
References: <CAD73D25.16401%mark@rabinergroup.com>

On Nov 2, 2011, at 5:32 PM, Mark Rabiner wrote:

> I looked up f 1.8 vs. 1.4 thinking it was between a half and a quarter of a
> stop and they are saying its 2/3rds!?!?! Anybody know that that's true?
> 
> Where is there a photo calculator that tells you these things?!?!?

I always thought the basic math for 1 f stop revolved around a factor of 1.4.
1.4 x 1.4 = 1.96
1.8 / 1.4 = 1.29

so - yes - 2/3 would seem close enough for?
what? I'm not sure.

Regards,
George Lottermoser 
george at imagist.com
http://www.imagist.com
http://www.imagist.com/blog
http://www.linkedin.com/in/imagist







Replies: Reply from piers.hemy at gmail.com (Piers Hemy) ([Leica] 1.8 vs. 1.4!?!?)
In reply to: Message from mark at rabinergroup.com (Mark Rabiner) ([Leica] 1.8 vs. 1.4!?!?)