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

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Subject: [Leica] Re: Half stop!
From: mark at rabinergroup.com (Mark Rabiner)
Date: Sat Dec 13 18:52:47 2008

On my EPSON CALCULATOR, 3.5 to 2.8 is ALSO about three-quarters of a stop.
4.0 to 2.8 is the normal full stop increase.  Same as my CANON Calculator!
:)



mark@rabinergroup.com
Mark William Rabiner



> From: Jim Nichols <jhnichols@lighttube.net>
> Reply-To: Leica Users Group <lug@leica-users.org>
> Date: Sat, 13 Dec 2008 18:46:46 -0600
> To: Leica Users Group <lug@leica-users.org>
> Subject: Re: [Leica] Re: Half stop!
> 
> 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
>> 
>> 
> 
> 
> 
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information



Replies: Reply from jhnichols at lighttube.net (Jim Nichols) ([Leica] Re: Half stop!)
In reply to: Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] Re: Half stop!)