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Photo Forum / Film Photography / Darkroom / May 2004Filter glass for Janpol enlarging lens?
I've recently acquired a Janpol 103 mm f/5.6 enlarging lens, the type with the color correction filters built into the lens. It's in excellent condition aside from someone having trimmed the top flange (which won't cause me any trouble). It needs the filter position on one screw calibrated (zero setting doesn't have the cyan filter quite clear of the light path), which shouldn't be hard, but the big problem is that the magenta filter glass has faded to a blue color with almost no red left in it. That's a problem because I had intended to use these filters for VC contrast control, just like using a color head, at least when enlarging my 6x9 negatives (I'll find another way for 35 mm, since the El-Omegar doesn't have those filters built in), and magenta is necessary to that use. Can anyone suggest a source for suitable magenta cc filtering glass? If I'm reading the dials correctly, it should be a 140 cc magenta, and I can cut a larger glass to fit if needed -- the actual glass is only about an inch square, and I don't envision huge problems in disassembling the filter section of the lens -- it looks simple enough.  SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. > I've recently acquired a Janpol 103 mm f/5.6 enlarging lens, the type > with the color correction filters built into the lens. It's in [quoted text clipped - 14 lines] > glass is only about an inch square, and I don't envision huge problems > in disassembling the filter section of the lens -- it looks simple enough. Look for places that sell replacement dichro filters for colour enlargers. Considering the cost I'm not sure it's worth it. I bought my Nikon 105mm for about the cost of one filter. http://www.fpointinc.com/web_store/Products/focal/fpdich.htm BTW why is it a problem? All the red is ND. If the blue is still filtering out the green light shouldn't it be just fine for B&W VC? All I used to use is a green and a blue filter. Nick > BTW why is it a problem? All the red is ND. If the blue is still filtering > out the green light shouldn't it be just fine for B&W VC? All I used to use > is a green and a blue filter. It's a problem because the magenta that's there isn't filtering the green, first; if I mix it with yellow, I see green, so it's not completely blockging green (as I'd expect, if it no longer looks red to the eye). And secondly, the filter is not longer transparent, it's gotten a frosted, translucent appearance (looks like it's on one surface) that prevents projecting a sharp image through it, so even if it blocked green well enough for VC use, I couldn't use it. Another poster suggested Agfa/ORWO CC filter sets, which are apparently glass and available cheaply -- I'll look for those. No great hurry -- no place to set up the enlarger yet anyway. SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. Donald Qualls <silent1@ix.netcom.com> schrieb: >I've recently acquired a Janpol 103 mm f/5.6 enlarging lens, the type >with the color correction filters built into the lens. I wasn´t aware they made a third version, I only know of the 5,6/50 and /80mm type. > It's in >excellent condition aside from someone having trimmed the top flange >(which won't cause me any trouble). It needs the filter position on one >screw calibrated (zero setting doesn't have the cyan filter quite clear >of the light path), Somewhere I have a diagram (vertical cut drawing) of the 50mm version. Do you need it? This is the german manual: http://rohleder.gmxhome.de/manuals/janpol.pdf >That's a problem because I had intended to use these filters for VC >contrast control, This is what I plan to do with mine, too. But I haven´t made it to calibrate my workflow on that... > just like using a color head, at least when enlarging >my 6x9 negatives (I'll find another way for 35 mm, since the El-Omegar >doesn't have those filters built in), and magenta is necessary to that >use. Can anyone suggest a source for suitable magenta cc filtering >glass? There are plenty of Agfa and Orwo (the part of Agfa that was left in the GDR) CC glas filters in packs of a dozen per color available for cheap. They usually go for one Euro at ebay.de... Do you want me to send you a link to an example auction? Gruss, Roman Signature"A man should always keep two things in mind: one is that he is a fool; the other is that he is going to die." (Gurdijew) > Donald Qualls <silent1@ix.netcom.com> schrieb: > [quoted text clipped - 3 lines] > I wasn´t aware they made a third version, I only know of the 5,6/50 > and /80mm type. Well, in fact I'm not certain it's a Janpol. The layout of filter controls is slightly different from the 50 mm and 80 mm version, with both knobs on front, but it does have the illuminating cover for the adjusting mark, as well as a click rotating flange at the top with the M42 thread mounted on it (this is the part that was trimmed by a previous owner -- no big deal, AFAIK). Lettering, as best I can convert from what looks like an industrial Cyrillic font, is BETA-22YU 5.6/103 872380 (the last, I presume, is a serial number), then a symbol that looks like a cross secion of a cemented achromat. This might be a Soviet/Russian copy of the Janpol design, I suppose... >>It's in >>excellent condition aside from someone having trimmed the top flange [quoted text clipped - 4 lines] > Somewhere I have a diagram (vertical cut drawing) of the 50mm version. > Do you need it? Surely wouldn't hurt, especially if it's labeled in English. > This is the german manual: > > http://rohleder.gmxhome.de/manuals/janpol.pdf I'm not sure that will help me -- my German is far worse than my Spanish, which itself isn't up to saying more than "hello", "goodbye" and "how are you?" without understanding any answer other than "soy bien!" >>That's a problem because I had intended to use these filters for VC >>contrast control, > > This is what I plan to do with mine, too. But I haven´t made it to > calibrate my workflow on that... There's lots of information various places on using CC filters for VC -- since the CC filter set is calibrated and all the same, 50 CC yellow should be the same with any CC setup. >>just like using a color head, at least when enlarging >>my 6x9 negatives (I'll find another way for 35 mm, since the El-Omegar [quoted text clipped - 7 lines] > > Do you want me to send you a link to an example auction? Cool! I hadn't even thought to look; I've seen only gelatin filters here. All I really need is a 140 CC magenta, but for a euro or two plus shipping, I might just get a whole pack. I'll check if such are available from US sellers (I got this lens from New York). SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. Donald Qualls <silent1@ix.netcom.com> schrieb: > Lettering, as best I can convert >from what looks like an industrial Cyrillic font, is BETA-22YU 5.6/103 >872380 (the last, I presume, is a serial number), It´s a Vega-22U (Y/U denouncing an enlarger lens) and the serial number indicates a production in 1987. >then a symbol that >looks like a cross secion of a cemented achromat. That´s the producers logo. Compare it with the logo collection at Nathan Dayton´s www.commiecameras.com and with http://cameras.alfredklomp.com/, the nice site maintained by Alfred Klomp. > This might be a >Soviet/Russian copy of the Janpol design, I suppose... Correct. Now, this is really odd. I have never heard of that lens. Any chance you could send me some close-up images of the lens or post it at the gallery located at http://beststuff.com/forums/list.php?f=21 (thats the discussion forum... "Up one Level" will bring you to the Gallery)? Thanks. >> Somewhere I have a diagram (vertical cut drawing) of the 50mm version. >> Do you need it? > >Surely wouldn't hurt, especially if it's labeled in English. It´s not labeled at all and buried in an old GDR darkroom book. I´ll look it up. >There's lots of information various places on using CC filters for VC -- >since the CC filter set is calibrated and all the same, 50 CC yellow >should be the same with any CC setup. True. I just lack the time and motivation. ;-) >Cool! I hadn't even thought to look; I've seen only gelatin filters >here. And even those can be put on a piece of glass and inserted in the lens. If it degrades - replace it throw it away. These are small and light enough to be sent at the rate of a large letter instead of a parcel. The Janpol lenses have glass filters with supposed to be non-fading dyes. I don´t get it why the soviet kind would degenerate like this. A cheap source of quality glass should be the glass used for microscopes. And they might fit without cutting them. Odd thing, I can´t find any at the moment. #-) I´ll send you the link if I stumble across an auction. > All I really need is a 140 CC magenta, but for a euro or two plus >shipping, I might just get a whole pack. Overall that will end up to be cheaper than buying a single filter for 25Dollar. > I'll check if such are >available from US sellers (I got this lens from New York). Good luck with that. Gruss, Roman Signature"A man should always keep two things in mind: one is that he is a fool; the other is that he is going to die." (Gurdijew) > Donald Qualls <silent1@ix.netcom.com> schrieb: > [quoted text clipped - 3 lines] > >>872380 (the last, I presume, is a serial number), <snip> >>This might be a >>Soviet/Russian copy of the Janpol design, I suppose... [quoted text clipped - 5 lines] > http://beststuff.com/forums/list.php?f=21 (thats the discussion > forum... "Up one Level" will bring you to the Gallery)? Thanks. Not today, but I might be able to manage it over this weekend. >>>Somewhere I have a diagram (vertical cut drawing) of the 50mm version. >>>Do you need it? [quoted text clipped - 3 lines] > It´s not labeled at all and buried in an old GDR darkroom book. I´ll > look it up. Cool! This is my real e-mail address. :) >>Cool! I hadn't even thought to look; I've seen only gelatin filters >>here. [quoted text clipped - 12 lines] > Odd thing, I can´t find any at the moment. #-) I´ll send you the link > if I stumble across an auction. Cool! >>All I really need is a 140 CC magenta, but for a euro or two plus >>shipping, I might just get a whole pack. > > Overall that will end up to be cheaper than buying a single filter for > 25Dollar. Depends on the cost of shipping from Europe to the US. I've paid more for shipping than the bid even for domestic purchases, though I generally just figure in the shipping when I decide how much to bid. Problem is, I don't know for certain what it costs to ship from Europe. >>I'll check if such are >>available from US sellers (I got this lens from New York). > > Good luck with that. Thanks! SignatureI may be a scwewy wabbit, but I'm not going to Alcatwaz! -- E. J. Fudd, 1954 Donald Qualls, aka The Silent Observer Lathe Building Pages http://silent1.home.netcom.com/HomebuiltLathe.htm Speedway 7x12 Lathe Pages http://silent1.home.netcom.com/my7x12.htm Opinions expressed are my own -- take them for what they're worth and don't expect them to be perfect. Donald Qualls <silent1@ix.netcom.com> schrieb: >Well, in fact I'm not certain it's a Janpol. The layout of filter >controls is slightly different from the 50 mm and 80 mm version, with >both knobs on front, but it does have the illuminating cover for the >adjusting mark, etc.pp. I just realized what may be a big setback for you if the Vega is based upon the same construction principle as the Janpol. The Janpol relies on two strips of glas, dyed in three colors (two each piece) and clear in the middle. If you watch from the side: Magenta Clear Yellow XXXXXX_______OOOOOO So, to replace it, you´ll need to find a piece of glass with the same specs. That might turn out to be impossible. So, try to get a set of gelatin filter for both the faded color and yellow and place them on a piece of glass. I´ll send you the sketch within the week, then you´ll see what I mean. Gruss, Roman Signature"A man should always keep two things in mind: one is that he is a fool; the other is that he is going to die." (Gurdijew) |
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