[rollei_list] Rollei 35 mm SLR Flange focal distance...Now Carl Zeiss answer direct to me:
- From: CarlosMFreaza <cmfreaza@xxxxxxxxx>
- To: "rollei_list@xxxxxxxxxxxxx" <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 9 Sep 2014 17:04:58 -0300
I asked the Rollei SL35 flange issue to Carl Zeiss Camera Lenses
directly, this is the answer I received a few minutes ago:
"Ihre Anfrage (Absender: cmfreaza@xxxxxxxxxxxx) vom 09.09.2014:
"Dear Carlos Manuel,
Thanks for your inquiry.
According to our recordings, the standard flange focal distance of the
vintage Rollei 35mm system (QBM) was 44.50mm.
Of course, some lens types (especially telephoto lenses) were adjusted
with a longer flange focal distance, to compensate material elongation
due to extreme temperatures.
For further details, please do not hesitate to contact us.
With Best Regards
Bertram Hönlinger
Carl Zeiss AG
Camera Lens Division
Kundencenter / Customer Care Center / PHO-VC
Kundensupport / Customer Support
Bertram Hönlinger
Carl-Zeiss-Straße 22 - 73447 Oberkochen
Telefon/Phone: +49 7364 20-6175
Fax: +49 7364 20-4045
Email: bertram.hoenlinger@xxxxxxxxx
http://www.zeiss.de/photo
Carl Zeiss AG
Vorsitzender des Aufsichtsrates: Dr. Dieter Kurz
Vorstand: Dr. Michael Kaschke (Vorsitzender),
Dr. Hermann Gerlinger, Dr. Ludwin Monz, Thomas Spitzenpfeil
Sitz der Gesellschaft: Oberkochen, Deutschland
Amtsgericht Ulm, HRB 501 555, USt-IdNr: DE 811 119940"
______________________________________________
2014-09-09 16:27 GMT-03:00 CarlosMFreaza <cmfreaza@xxxxxxxxx>:
> I forgot Prochnow's Rollei Technical Report book yesterday, I found
> this info for the Rolleiflex SL35 (page 3-225):
>
> " 4. Adjust and check infinity- setting and optical axis (with gaugue
> and on collimator).
> Plane measurement and optical axis measured with gaugue L-8613: 44,67
> + 0,02mm . Note: Measured from lens contact surface of bayonet ring to
> the pressure plate-plane"
>
> "Focusing screen Plane measured with collimator
> 44,50 +/- 00,3mm = 0 +/- 3 graduations (75/80 scale)"
>
> I add that the figures from "0" are for the Rollei collimator
>
> And then both figures 44,67mm and 44,50mm are used for the Rolleiflex
> SL35 cameras optical adjustment, the first one for the lens register
> and the second one for the focusing screeen plane.
>
> I think 44,67mm is the figure to keep in mind for a QBM lens adapter
> to a non QBM camera.
>
> Carlos
>
>
>
> 2014-09-09 15:32 GMT-03:00 CarlosMFreaza <cmfreaza@xxxxxxxxx>:
>>> Perhaps it would be necessary to clarify if Dirk needs the back focal
>>> distance, 44,50mm to assure a right focus for the QBM lenses with the
>>> adapter for Canon, or if the mechanical distance 44,67mm is enough to
>>> assure it or if both distances are the same for practical purposes.
>>> Carl Zeiss confirmed as flange distance for the QBM 44,50mm as I wrote
>>> yesterday and they give the back lens distance to film in their
>>> technical info, f.e. according the Planar 1.4/50 Contax /Yashica
>>> technical sheet the lens back distance "to film" is 45,50mm (there are
>>> no technical sheets on line for QBM lenses).
>>>Carlos
>>
>> This is the Contax/Yashica mount Planar 1.4/50 lens technical sheet,
>> it could give an idea baout the way Carl Zeiss measures the 44.50mm
>> for the QBM:
>>
>> http://www.zeiss.com/content/dam/Photography/new/pdf/en/downloadcenter/contax_yashica/planar1-4_50mm_yashica_e.pdf
>>
>> Carlos
---
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