uli_mayer

Mike,

yes, the Heliopan Bay II fits with the Rollei lens hood attached. Uli

Peder,

you may try HELIOPAN ( www.heliopan.de); I got my polarizer there for less than 100 Deutschmarks ( 5 years ago ). Current list price for polarizer with bayonet II mount should be EURO 73,00 including tax. There are digits engraved on the outer rim to help keeping the "angle" when moving the polarizer from viewing to taking lens.

Since Mutars have become prohibitively expensive and older attachements were optically poor, isn't there a way to get a Portrait-Rolleiflex by using one ( i.e. two ) of the better tele adapters, as they are made today for digicams for example by Zeiss or Century? I am sure there would be some loss in resolution and probably some vignetting, but may be not to an extent to make such a combination useless for portraits. It's just an idea. Is there somebody who tried it and likes to tell his(her) experienbce? Thanks Uli

I asked this question myself some time ago, and found a lot of practical answers in a book titled "DARKROOM 2",edited by JAIN KELLY, and published by LUSTRUM PRESS, 1978. Nine well-known photographers, including Lisette Model,A.Siskind, F. Gohlke and Cole Weston therein describe in detail ( in text and photos ) how they do dodging and burning and other 'tricks'in order to achieve what they want.

Luciano,

you may get a fresnel screen big enough for 8x10 for a much lower price from manufacturers/distributors of overhead projectors. Since those screens are square, mostly 28x28cm, you will have to get it cut to fit your ground glass ( by a window maker for instance ). I got mine in Munich for less than 40 Euro and did the cutting myself with a fine toothed saw. Beware: One has to cut symmetrically in order to keep the Fresnel lens centered.

Have you had a look at "schneiderkreuznach.com/archiv/pdf/gcn.pdf" ?

That file should give you at least some authoritative information about your G-Claron's original opto-mechanical dimensions. Hope this helps.

Uli

I happened to call Schneider today ( at Kreuznach factory ) for getting information about exactly the same phenomenon, clearly to be seen inside my Symmar-S from the mid-seventies. The gentleman there, apparently an optical engineer, told me, that what's somehow looking like a starry sky , is nothing but a magnified image of the black layer of thin paint around the inner lens rim, which had been partly degraded by chemical reactions and UV-radiation,leaving those tiny white spots. He assured me, that even with very sophisticated instruments it would be hard to detect any measurable amount of fall-off in contrast, and more importantly, certainly none at all in practical photography.

Wide Angle Aristostigmats are almost symmetrical Gauss-type lenses consisting of four air-spaced menisci, following an order of

+ - : - + , designed by F. Kollmorgen and produced then by Hugo Meyer, Goerlitz shortly after 1900. These Aristostigmats were well renowned for their flat field and their covering power ( according to a manufacturer's ad it should be nearly 100 degrees ). Among the lens makers who followed the path of this design were Plaubel with its Weitwinkel-Orthar and - not to forget - Kodak with its Wide Field Ektar.

Addendum: According to the Zeiss information mentioned above, the combined focal length of 41+41cm components is 24 centimeters. Sorry for omitting the most important part. Uli

Hi,

my Zeiss-list ( Zeiss publication H.XII.38) states about the combined 41cm + 41cm Doppel-Protar: max. apert.: 1:6.3, recommended for 16x21cm format, image circle at "small stop" 37cm. It also says that this lens ( code: FOETORIBUS ) could be had in Compur- or Compound shutter or in normal- barrel, size VIII. Having seen quite a couple of Protars ( and bought some ) my guess is: The "VIII" on your lens mount relates to the barrel size needed for proper spacing, and not to a series VIII I have never seen mentioned in lens lists or lens literature. Just one Pfennig,

Uli