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Photo Forum / Film Photography / Large Format / June 2005Schneider Tele-Xenars
Does anyone know the size of the circle of coverage for these older lenses? I'm particularly wondering about the 180mm f5.6, 240mm f5.5 and 270mm f5.5. Anything else (like flange distance) would be interesting, but its the circle sizes I'm really after. I could measure them, but I want to know what size Schneider _thinks_ they cover, since they allow for softening at the edges in their figures, which can be a lot smaller than the total circle of illumination. For some reason they aren't listed in the (otherwise very useful) bit of the Schneider site that deals with out of production lenses. (The Repro-Clarons aren't listed either, which is a shame.) Thanks in advance, Peter  Signaturehttp://www.bard-hill.co.uk > Does anyone know the size of the circle of coverage for these older lenses? > [quoted text clipped - 8 lines] > Schneider site that deals with out of production lenses. (The Repro-Clarons > aren't listed either, which is a shame.) http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/tele-x enar/data/Tele_Xenar_1938_Leaflet.pdf That's the 1938 numbers. They give the circle in inches so you'll have to get the calculator out if you want mm. Nick Signature--------------------------------------- "Digital the new ice fishing" --------------------------------------- > > Does anyone know the size of the circle of coverage > > for these older lenses? [quoted text clipped - 5 lines] > > but I want to know what size Schneider _thinks_ > > they cover, since they allow for softening at the edges > > in their figures, which can be a lot smaller than the > > total circle of illumination. > > > > For some reason they aren't listed in the (otherwise > > very useful) bit of the Schneider site that deals with > > out of production lenses. (The Repro-Clarons > > aren't listed either, which is a shame.) http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/tele-x enar/data/Tele_Xenar_1938_Leaflet.pdf > That's the 1938 numbers. They give the circle in inches > so you'll have to get the calculator out if you want mm. Ah, thanks Nick - Since the FLs that interest me aren't listed with the other TXs I hadn't thought that there'd be something 'completely different' buried away in the old brochure. Thanks v. Much, Peter > Does anyone know the size of the circle of coverage for these older > lenses? www.schneideroptics.com Click on 'vintage lens info'. > >For some reason they aren't listed in the (otherwise > >very useful) bit of the Schneider site that deals with > >out of production lenses. (The Repro-Clarons > >aren't listed either, which is a shame.) And then: > www.schneideroptics.com > > Click on 'vintage lens info'. Didn't I just say that if it was on the Schneider site, I couldn't find it?... oh, never mind. P. > Didn't I just say that if it was on the Schneider site, I couldn't find > it?... oh, never mind. Okay, let me hold your hand: http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/tele-xenar/ > > Didn't I just say that if it was on the Schneider site, I couldn't find > > it?... oh, never mind. > > Okay, let me hold your hand: http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/tele-xenar/ Thanks for the link. At least I've found data for one of my 2 vintage Xenar lenses :- the 150 f4.5 Xenar, but not for the 240 f5.5 Tele-Xenar. I also find it interesting to see that the image circle data is computed for f16. I've yet to use f16 as the slow speeds on both my lenses are "iffy" at best. (You can tell that I was brought up on 35mm lenses...) SignatureM Stewart Milton Keynes, UK http://www.megalith.freeserve.co.uk/oddimage.htm >> > Didn't I just say that if it was on the Schneider site, I couldn't find >> > it?... oh, never mind. [quoted text clipped - 9 lines] > f16. I've yet to use f16 as the slow speeds on both my lenses are "iffy" at > best. (You can tell that I was brought up on 35mm lenses...) I think either F/16 or F/22 is normal. Many lenses are designed to be only focused at wider apertures. Nick Signature--------------------------------------- "Digital the new ice fishing" --------------------------------------- [SNIP] http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/tele-xenar/ > Thanks for the link. At least I've found data for one of > my 2 vintage Xenar lenses :- the 150 f4.5 Xenar, but > not for the 240 f5.5 Tele-Xenar. That's one of the ones I was after and that isn't listed on that page. Nick's posting pointed me in the right direction however: even though the 240 isn't listed on the Tele-Xenar page, it _is_ amongst the lenses covered in the old 1938 brochure that is now linked from that page. Peter > > Didn't I just say that if it was on the Schneider site, I > > couldn't find it?... oh, never mind. > > Okay, let me hold your hand: http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/tele-xenar/ Did you actually read my post, and then look at that page? It was wholly clear from my original post that I had, yet you pointed me to the site I'd already said I couldn't find what I wanted on: NONE of the FLs I said I was interested in are among the ones listed on the page. Nick was helpful, you have simply been arrogant. Oh well. P. On 6/25/2005 6:02 AM Bandicoot spake thus: >> > Didn't I just say that if it was on the Schneider site, I >> > couldn't find it?... oh, never mind. [quoted text clipped - 10 lines] > > Nick was helpful, you have simply been arrogant. Oh well. He's an old fart. You gotta cut him some slack. Signature- The French Revolutionary Calendar (in use 1793-1806): * Vendémiaire (from Latin vindemia, "vintage") Starting Sept 22, 23 or 24 * Brumaire (from French brume, "mist") Starting Oct 22, 23 or 24 * Frimaire (From French frimas, "frost") Starting Nov 21, 22 or 23 * Nivôse (from Latin nivosus, "snowy") Starting Dec 21, 22 or 23 * Pluviôse (from Latin pluviosus, "rainy") Starting Jan 20, 21 or 22 * Ventôse (from Latin ventosus, "windy") Starting Feb 19, 20 or 21 * Germinal (from Latin germen, "seed") Starting Mar 20 or 21 * Floréal (from Latin flor, "flower") Starting Apr 20 or 21 * Prairial (from French prairie, "meadow") Starting May 20 or 21 * Messidor (from Latin messis, "harvest") Starting Jun 19 or 20 * Thermidor (from Greek thermos, "hot") Starting Jul 19 or 20 * Fructidor (from Latin fructus, "fruits") Starting Aug 18 or 19 [SNIP] > He's an old fart. You gotta cut him some slack. LOL - yeah, if he hadn't changed his handle I'd have realised sooner who it was and just said to myself "ah, here comes JJ again..." ;-) Peter > Does anyone know the size of the circle of coverage for > these older lenses? [quoted text clipped - 20 lines] > > Peter Is the 180mm, f/5.6 a type for f/5.5, I could not find any f/5.6 Tele-Xenar lenses. My 1958 catalogue lists all three focal lengths but gives formats rather than image circles for coverage. All are f/5.5 I've calculated the diagonals. Actual image circles should be a bit larger than this. Telephoto lenses sometimes have very large circles of illumination but the circle of good definition is seldom much larger than the format for which they are intended. 180mm 60x90 mm 108mm 240mm 90x120mm 201mm 270mm 90x120mm 201mm Other focal lengths listed are: 360mm 130x180mm 222mm 500mm 180x240mm 300mm The 180mm lens will cover 2-1/4 x 3-1/4 (normal FL 101mm) The 240 and 270mm will cover 4x5. (Normal FL 152mm The 360 will cover 5x7. (Normal FL 210mm) The 500 will just cover 8x10. (Normal FL 302mm) I have no other data other than shutter sizes. This is pretty much a sales brochure with little technical data. Signature--- Richard Knoppow Los Angeles, CA, USA dickburk@ix.netcom.com > > Does anyone know the size of the circle of coverage > > for these older lenses? > > I'm particularly wondering about the 180mm f5.6, > > 240mm f5.5 and 270mm f5.5. [SNIP] > Is the 180mm, f/5.6 a type for f/5.5, I could not find > any f/5.6 Tele-Xenar lenses. Oops, yes, they should all be listed as f5.5. > My 1958 catalogue lists all three focal lengths but gives > formats rather than image circles for coverage. All are > f/5.5 I've calculated the diagonals. Actual image circles > should be a bit larger than this. Telephoto lenses > sometimes have very large circles of illumination but the > circle of good definition is seldom much larger than the > format for which they are intended. Absolutely - that's why I hoped to get some actual figures rather than simply measuring the circle of illumination - so thanks for this, very helpful. > 180mm 60x90 mm 108mm > 240mm 90x120mm 201mm [quoted text clipped - 13 lines] > I have no other data other than shutter sizes. This is > pretty much a sales brochure with little technical data. Thanks very much Richard - for the three shorter lenses this is about what I expected, and the confirmation is useful. Interesting that the 360 covers 5x7: that would make one a nice longer lens to try on my 6x17 some time. Come to that, maybe I'll shoot a 6x17 frame with the 270, just to see how soft the ends of the frame get. Peter |
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