Hi, Frank,
This thread reminds me that "odd-ball" aperture numbers have been around, in
one form or another, for more than 100 years. I have a Ross-London brass
lens with Waterhouse stops, made around 1890, that has its own unique
numbering system. If I recall correctly, the largest stop equates to f/16.
http://gallery.leica-users.org/v/OldNick/Ross+Lens+2.jpg.html
Here is the lens in use:
http://gallery.leica-users.org/v/OldNick/Final+Assembly.jpg.html
And here is an image made with that combination:
http://gallery.leica-users.org/v/OldNick/Mocking+Bird.jpg.html
Thanks for giving me a chance to reminisce.
Jim Nichols
Tullahoma, TN USA
----- Original Message -----
From: "Frank Wijsmuller" <wijsmuller@xxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Sunday, March 03, 2013 1:46 PM
Subject: Re: [OM] [OM Pen FT meter numbers
> For visual proof of Chuck en my remarks look at the front page of this
> brochure... <http://www.skipwilliams.com/olympus/pen-lit/o-penft-1067.pdf>
> Clearly visible is the 0.5 minimum number of the 50-90mm lens.
> I'd guess it has something to do with the image circle of the lens and/or
> the non linearity of the light meter (it looks special).
> Best, Frank
>
>
>
>
> 2013/3/3 Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
>
>> But if you look at the detail given on the lens list 0 represents max
>> aperture on only about half of the lenses. Some have max aperture = 0.5
>> or 1.0.
>>
>> Chuck Norcutt
>>
>>
>> On 3/3/2013 12:56 PM, John Hermanson wrote:
>> > According to the Pen FT owners manual I found on line, "0" on the Pen
>> > scale coincides with whatever the maximum aperture of the lens in use
>> > happens to be. 38mm f1.8, "0" = 1.8, 100-200mm f5 zoom, "0" = f5.
>> >
>> > ___________________________________
>> > John Hermanson | CPS, Inc.
>> > 21 South Ln., Huntington NY 11743
>> > 631-424-2121 | www.zuiko.com
>> > Olympus OM Service since 1977
>> > Gallery: www.zuiko.com/album/index.html
>> >
>> > On 3/2/2013 4:51 PM, Frank Wijsmuller wrote:
>> >> Hi Chuck,
>> >> is this the brochure you read?
>> >> <http://www.skipwilliams.com/olympus/pen-lit/o-penft-1067.pdf>
>> >> A nice one anyway.
>> >> Best, Frank.
>> >>
>> >> 2013/3/2 Chuck Norcutt
>> >>
>> >>> I've never had a Pen before and knew nothing of this non-f/stop
>> >>> numbering system until I just looked it up in an Olympus Pen-FT
>> >>> brochure.
>> >
>> --
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