Archived posting to the Leica Users Group, 2008/12/13

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Subject: [Leica] Re: Half stop!
From: jhnichols at lighttube.net (Jim Nichols)
Date: Sat Dec 13 16:46:50 2008
References: <200812132157.mBDLvF2t072954@server1.waverley.reid.org> <E5F43EB6-EFD0-4D25-B5A8-244BD27D1F98@optonline.net>

On my trusty HP calculator, 3.5 to 2.8 is about three-quarters of a stop. 
4.0 to 2.8 is the normal full stop increase. Just my 2 cents.

Jim Nichols
Tullahoma, TN USA
----- Original Message ----- 
From: "Lawrence Zeitlin" <lrzeitlin@optonline.net>
To: <lug@leica-users.org>
Cc: "Lawrence Zeitlin" <lrzeitlin@optonline.net>
Sent: Saturday, December 13, 2008 4:49 PM
Subject: [Leica] Re: Half stop!


>
> On Dec 13, 2008, at 12:50 PM, Marc James Small wrote:
> Larry
>
> With respect, it is a third of a stop, not a half-stop.  The European 
> apertures are 1/3 of a stop different from the International scale  which 
> has been the norm since the 1950's.
>
> Marc
>
>
> Strange. I get 1.56 times increase in light transmitting power going  from 
> f3.5 to f2.8. Seems like half a stop to me. Do the math and tell  me what 
> you think.
>
> Larry Z
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>
> 



Replies: Reply from mark at rabinergroup.com (Mark Rabiner) ([Leica] Re: Half stop!)
In reply to: Message from lrzeitlin at optonline.net (Lawrence Zeitlin) ([Leica] Re: Half stop!)