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

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] Re: Half stop!
From: mark at rabinergroup.com (Mark Rabiner)
Date: Sat Dec 13 21:39:58 2008

Also known as Postfix notation.
Which instead of a slide rule you have little yellow pads;


And a gel pen.


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 22:27:05 -0600
> To: Leica Users Group <lug@leica-users.org>
> Subject: Re: [Leica] Re: Half stop!
> 
> Hi, Mark,
> 
> Glad we can agree.  Especially since the HP that I use makes use of a
> reverse-Polish notation system. ;-)
> 
> Jim Nichols
> Tullahoma, TN USA
> ----- Original Message -----
> From: "Mark Rabiner" <mark@rabinergroup.com>
> To: "Leica Users Group" <lug@leica-users.org>
> Sent: Saturday, December 13, 2008 8:52 PM
> Subject: Re: [Leica] Re: Half stop!
> 
> 
>> 
>> 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
>> 
>> 
>> 
>> _______________________________________________
>> 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



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