[rollei_list] Re: OT:Walter Voss Diax cameras
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 22 Oct 2009 17:31:32 -0300
Yes Richard, you are right, but users and manufacturers assumed 50mm
like the "normal" focal length for 35mm from Oskar Barnack, the Leica
creator, took this decision as compromise between the theorical value
(43.3mm) and lens design issues at the the time as you wrote, a
slightly longer focal length allowed better sharpness for the lens.
The 3,5/40mm focal length was a decision taken by the Rollei 35
designer Heinz Waaske, at f 3,5 and 40mm the lens was small enough to
fit it in the sliding tube (it was redesigned for the Sonnar 2,8/40),
it was also considered that most viewfinder cameras at the time were
using 45mm lenses as normal lens, anyway 40mm to 58mm are considered
"normal" for 35mm, but 40mm lenses are rare despite I have seen some
of them.
In the other hand, the true 6x6 Rollei format is 56x56mm, the diagonal
is 79.2mm and then 80mm and 75mm are close to the diagonal.-
Carlos
2009/10/22 Richard Knoppow <dickburk@xxxxxxxxxxxxx>:
>
> ----- Original Message ----- From: "CarlosMFreaza" <cmfreaza@xxxxxxxxx>
> To: <rollei_list@xxxxxxxxxxxxx>
> Sent: Wednesday, October 21, 2009 7:42 PM
> Subject: [rollei_list] Re: OT:Walter Voss Diax cameras
>
>
> 2009/10/21 Elias Roustom <eroustom@xxxxxxxxxxx>:
> ....
>>
>> I have a very similar Rollei 35 to yours. I've been giving my Rollei 35 a
>> lot of attention lately.
>> It adequately meets the needs of a very wide range of 35mm photography.
>
> ...
>
> Thank you Elias.
> The only difference is your Rollei 35 has a S-Xenar 3,5/40 lens and
> this is not a difference because it's a Tessar 3,5/40 copy.
> I'll never forget the excellent way my Rollei 35 captured several
> Spaniard-colonial churches inner light working at 1/15 f4 and f3,5
> camera handheld when I visited Córdoba city -the second largest city
> in my country- two years ago, The photographs are in my Flickr gallery
> and I think several of the members have seen them. Knowing the very
> difficult conditions to take those photographs, I only can think the
> Rollei 35 is an excellent camera.
> Some people don't like the 40mm focal length saying it is not
> "normal" for the 35 mm format and it is not a wide angle lens yet,
> however it increases the lens DOF regarding a 50mm lens and the images
> still don't have the "wide angle" look.
>
> Carlos
> ---
>
> Mostly "normal" means a lens which is equal in focal length to the
> diagonal of the format. For 35mm that comes out to about 44 mm, but, if you
> assume that most 35mm images will be cropped to about 1.33:1 format the
> focal length come out to 40mm! 1.33:1 is the old standard motion picture
> format and is about an average of common paper formats. I suspect 50mm
> became "normal" because it may have been easier to design an adeqate lens if
> the focal length was slightly longer.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
>
>
>
>
> ---
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