[rollei_list] AW: Re: AW: Rollei 35 mm SLR Flange focal distance...Now Carl Zeiss answer direct to me:
- From: <Dirk-Roger.Schmitt@xxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 9 Sep 2014 22:17:02 +0000
My points now:
If a lens maker says, the flange focal distance is, for example 44,50 mm for
QBM, or 44,00 mm for EF, this is the distance of best focus.
So then the camera maker has to take care which real distance of film (in the
past) or digital sensor he has to design the camera body to obtain optimal
sharpness in the image.
For me it makes more and more clear, that I have to trim my adapter to the 0.50
mm. Question is left to which tolerances.
Dirk
Dirk-Roger Schmitt
-----Ursprüngliche Nachricht-----
Von: rollei_list-bounce@xxxxxxxxxxxxx [mailto:rollei_list-bounce@xxxxxxxxxxxxx]
Im Auftrag von CarlosMFreaza
Gesendet: Dienstag, 9. September 2014 23:10
An: rollei_list@xxxxxxxxxxxxx
Betreff: [rollei_list] Re: AW: Rollei 35 mm SLR Flange focal distance...Now
Carl Zeiss answer direct to me:
Dirk:
I'm surprised too, I sent the question this morning and received the
answer this afternoon, however they also were very kind last year when I asked
about the manufacture year for an old Sonnar
2/50 lens, I have no doubt CZ has the data, they manufactured QBM lenses for
Rollei from the beginning and had a joint-venture with Rollei to manufacture
lenses in the former Voigtlaender factory. CZ has the data from the lens point
of view; the Rollei Technical Report (they are instructions taken from the
factory technical papers) talk about the camera mechanical adjustments to get a
right optical register. Carl Zeiss has only one figure for their lenses flange,
as we can see in the technical sheets, and then 44,50mm must be right from the
lens point of view (BTW, I'm not an expert in fine mechnics and i?m not an
expert about optics).
Carlos
2014-09-09 17:44 GMT-03:00 <Dirk-Roger.Schmitt@xxxxxx>:
> Carlos,
> you are unbelievable!
> You not only sent your VSL3 E from South America to FFS in Braunschweig,
> Germany, for full refurbishment, you are also enquiring data from Carl Zeiss
> and obtain a qualified answer in short time.
> And honestly, I am wondering that Zeiss has this data in hands.
>
>
>
>
> Dirk-Roger Schmitt
>
>
>
>
> -----Ursprüngliche Nachricht-----
> Von: rollei_list-bounce@xxxxxxxxxxxxx
> [mailto:rollei_list-bounce@xxxxxxxxxxxxx] Im Auftrag von CarlosMFreaza
> Gesendet: Dienstag, 9. September 2014 22:05
> An: rollei_list@xxxxxxxxxxxxx
> Betreff: [rollei_list] Rollei 35 mm SLR Flange focal distance...Now Carl
> Zeiss answer direct to me:
>
> 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/downloadcent
>>> e r/contax_yashica/planar1-4_50mm_yashica_e.pdf
>>>
>>> Carlos
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