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Photo Forum / Film Photography / Darkroom / September 2004Enlarger lens thread size
I need to have a new lens board made for my Kodak Precision enlarger, to take an 80mm Componon-S lens. The board is 3mm thick and there is not enough thread sticking out the back to get a retaining ring on. I'm therefore thinking about getting a local engineering workshop to cut an appropriately sized hole in the board, and thread it. I understand the thread is 39mm diameter, but what about the thread pitch, tpi etc. What do I need to tell them? Thanks Stu > I need to have a new lens board made for my Kodak Precision enlarger, > to take an 80mm Componon-S lens. The board is 3mm thick and there is [quoted text clipped - 3 lines] > understand the thread is 39mm diameter, but what about the thread > pitch, tpi etc. What do I need to tell them? http://www.schneideroptics.com/info/faq/photo_enlarging/#q3 Nick > I need to have a new lens board made for my Kodak Precision enlarger, > to take an 80mm Componon-S lens. The board is 3mm thick and there is [quoted text clipped - 3 lines] > understand the thread is 39mm diameter, but what about the thread > pitch, tpi etc. What do I need to tell them? It uses Leica thread M39 x 26Gg.60degrees http://www.schneideroptics.com/photography/photo_enlarging/componon-s/pdf/compon on-s_40_80.pdf > I need to have a new lens board made for my Kodak Precision enlarger, > to take an 80mm Componon-S lens. The board is 3mm thick and there is [quoted text clipped - 3 lines] > understand the thread is 39mm diameter, but what about the thread > pitch, tpi etc. What do I need to tell them? Assuming this is the same thread used on more recent enlargers, it's also the same as used on Leica Thread Mount (LTM) lenses -- and I'm sure I'll be corrected if this is incorrect, but I believe it's 1 mm thread pitch and a standard metric thread profile (60 degree, flat top and bottom). Take along the lens when you take the board in for machining, and the shop should be able to accurately measure the thread pitch in a minute or two. If they can't, you might consider having the work done somewhere else...  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. On 9/29/2004 5:05 AM Donald Qualls spake thus: >> I need to have a new lens board made for my Kodak Precision enlarger, >> to take an 80mm Componon-S lens. The board is 3mm thick and there is [quoted text clipped - 12 lines] > minute or two. If they can't, you might consider having the work done > somewhere else... Or alternatively, if the lens mount is LTM (Leica thread mount) as described above, then you can do as I did and use the lens mount from a SovCam--any of the Soviet Leica copies (Zorki & FED). Since I work on these old cameras, I happened to have a spare lens mount, which has 4 mounting holes to easily attach to a flat lensboard. You can probably obtain one of these from other SovCam tinkerers or from one of the folks who repair them. SignatureEverybody's worried about stopping terrorism. Well, there's a really easy way: stop participating in it. - Noam Chomsky > I need to have a new lens board made for my Kodak Precision enlarger, > to take an 80mm Componon-S lens. The board is 3mm thick and there is > not enough thread sticking out the back to get a retaining ring on. The normal solution is to countersink the area around the hole so that the retaining ring can retain. This will be cheaper and more reliable than threading. Most enlarging lenses use the Leica Screw Mount thread: 39mm by 26 threads/inch - not one of your common sizes. SignatureNicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/ >I need to have a new lens board made for my Kodak Precision enlarger, > to take an 80mm Componon-S lens. Nicholas' suggestion to have the board counter-sunk is the way to go (IMHO), if you have a machinist do the work. If you are determined to have the board threaded for the lens, bring the lens with you to the shop. What I fear is that they will compromise and use an existing thread set-up that's "really close" and mess you up. "> > Nicholas' suggestion to have the board counter-sunk is the way to go (IMHO), > if you have a machinist do the work. If you are determined to have the board > threaded for the lens, bring the lens with you to the shop. What I fear is > that they will compromise and use an existing thread set-up that's "really > close" and mess you up. Thanks for all your replies. I think I'll go the counter-sink way. It should be cheaper too! Stu |
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