tgray Posted March 27, 2008 Share #1 Posted March 27, 2008 Advertisement (gone after registration) I'm thinking of trading in my M6 for and M7. I was curious to know if the optical DX reader on the M7 fogs/exposes infrared film. Anybody know? I know a lot of you with M7's probably never upgraded to the optical reader, but maybe someone knows the answer. With HIE off the market, maybe it's a silly question... Link to post Share on other sites More sharing options...
Advertisement Posted March 27, 2008 Posted March 27, 2008 Hi tgray, Take a look here M7 and infrared. I'm sure you'll find what you were looking for!
usefeet Posted March 27, 2008 Share #2 Posted March 27, 2008 I'm thinking of trading in my M6 for and M7. I was curious to know if the optical DX reader on the M7 fogs/exposes infrared film. Anybody know? I know a lot of you with M7's probably never upgraded to the optical reader, but maybe someone knows the answer. With HIE off the market, maybe it's a silly question... These are my thoughts. I doubt very much the optical DX reader will have any effect on your film. -The reasons are: [1] To a large extent, the optical array is contained within it's own cavity. [2] The optical light should only activate very briefly on camera switch-on , and then turn-off (there is no logical reason to continuously power up and waste energy). Link to post Share on other sites More sharing options...
fotohuis Posted March 27, 2008 Share #3 Posted March 27, 2008 Normally IR light diodes will fog sensitive films like HIE. One of the reasons you can only use this film in manual, mechanical camera's. The IR transport diodes in a SLR's will also fog a part of the film. However my M7 has not the DX reader so it has no problem with any IR film I am using. Not an answer your question, because you want to know if an M7 with optical reader will fog an IR film. Best regards, Robert Link to post Share on other sites More sharing options...
tgray Posted March 28, 2008 Author Share #4 Posted March 28, 2008 Yeah, but everytime you turn the camera on and off, it rereads the DX code, correct? Anyway, here's what Leica had to say: "The DX code pattern that is applied to the outside of the film canister is almost on the opposite side of where the film comes out so there is no danger of the camera's sensor strip fogging the film." Maybe I'll be lucky enough to confirm this in practice Link to post Share on other sites More sharing options...
usefeet Posted March 28, 2008 Share #5 Posted March 28, 2008 Yeah, but everytime you turn the camera on and off, it rereads the DX code, correct? Yes, true, but to read DX should take microseconds, so should not be a problem because film exposure needs much longer, ...in any case, Leica confirmed that the LED-array is contained in it's own space. BTW, does this mean you have lots of Kodak HIE? I believe this film is hard to get now that Kodak has ceased production. As far as I am aware, other brands are not as sensitive to light as HIE. Cheers Link to post Share on other sites More sharing options...
tgray Posted March 28, 2008 Author Share #6 Posted March 28, 2008 Not lots, but 20 rolls bought the day HIE was discontinued. Link to post Share on other sites More sharing options...
usefeet Posted March 28, 2008 Share #7 Posted March 28, 2008 Advertisement (gone after registration) Not lots, but 20 rolls bought the day HIE was discontinued. That was well done, it's the best of them all (I have some too!). Link to post Share on other sites More sharing options...
tgray Posted March 28, 2008 Author Share #8 Posted March 28, 2008 It was actually very frustrating. It was about 2 months before I graduated from graduate school, so I was at my poorest. And about 3 weeks before that, I stumbled on a cache of Kodachrome (about 20-30 rolls of 64 and about 20 of 25) so I bought that, making my financial situation even worse. Then came the HIE announcement. It really stretched the budget. Had it happened a couple months later, I would have purchased a larger stock of 60-80 rolls. So it goes. At least I got my 20 in. I knew it remaining stock would go fast. Link to post Share on other sites More sharing options...
fotohuis Posted March 28, 2008 Share #9 Posted March 28, 2008 Well, your alternative is the Rollei IR 820/400, a 820nm in sensitivity IR film, available in 35mm, 120 rol film and 4x5". It's produced by Gevaert in Belgium, for the Rollei/Maco company. The characteristics shows that the sensitivity is going down fast over 750nm but normally therefore no problem with some IR light diode inteference. HIE is going over 900nm and therefore you can use this film with a red filter to get the 'wood' effect. Further HIE has no A.H. layer. For the Rollei film you will need a 89B or even better a 88A filter (so 695nm or 715nm) to get the 'wood' effect. Under the right IR circumstances in the atmosphere you will have iso 12-25 with this film then. RG695 or RG715 is a "black" IR filter: No problem for working with a R.F. but no way with a SLR camera. You can load and unload this Rollei IR filter in very subdue light in the camera. Here are the specs and some examples: http://www.fotohuisrovo.nl/documentatie/RolleiIR-400.pdf Fotohuis RoVo's Gallery - Rollei Infra Red Roll film Fotohuis RoVo's Gallery - Rollei Infra Red 35mm The slow speed alternative is Efke IR820 (iso 100), but with the same filter setting you're working in the iso 1-3 range then. The last Near I.R. production film is the SFX 200 from Ilford. Link to post Share on other sites More sharing options...
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