Philippe Lignieres Posted September 23, 2011 Share Posted September 23, 2011 Hi everybody, Just as said in the tittle, i was wondering if loading 50' B&H magazines under infrared camera is possible without causing damage to the film ? B&H magazines are very special and very difficult to load it without looking just a bit... I poligise for my poor english. Philippe Link to comment Share on other sites More sharing options...
John Salim Posted September 23, 2011 Share Posted September 23, 2011 Absolutely no problem using infra-red monitoring Philippe. You can use it with any speed panchromatic B&W or colour film...... but not with infra-red film of course ! John S :) Link to comment Share on other sites More sharing options...
Brian Pritchard Posted September 24, 2011 Share Posted September 24, 2011 You do need to be a bit careful in case the IR lamps are giving off any visible light. You could test a short length of a fast B/W stills neg by leaving it under the lamp for a few minutes with a coin placed over the middle of the film and then developing it to see if there is an image of the coin. This is the standard way to test a safelamp in a photographic darkroom. Brian Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted September 24, 2011 Premium Member Share Posted September 24, 2011 I'd have thought the issue would be light from the video monitor. What's the plan, do it inside a changing bag with a cable run to the outside world? Most IR illuminators will be LEDs which very definitely can emit some very deep visible red light. P Link to comment Share on other sites More sharing options...
John Salim Posted September 24, 2011 Share Posted September 24, 2011 I'd have thought the issue would be light from the video monitor. What's the plan, do it inside a changing bag with a cable run to the outside world? Most IR illuminators will be LEDs which very definitely can emit some very deep visible red light. P Probably a bit difficult to set up an IR camera inside a changing bag, but you could adapt a 'dark box' ( as used by high street minilabs ), or make one large enough to take a camera or magazine ( you could even use a wireless CCTV camera nowadays ). IR LED's are very suitable as IR illuminators as they have a narrow peak in the IR region, are quite bright and will never emit visible light. Personally I use IR goggles in the darkroom :ph34r: John S Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted September 24, 2011 Premium Member Share Posted September 24, 2011 will never emit visible light. This is definitely not true for all types of IR LED. I've seen infra-red emitters for things like auditorium sound systems (for people with hearing problems) in cinemas and theatres emit really quite a lot of very deep red visible light. So, this could be a dangerous assumption. There are, I believe, near IR and deep IR types, and the choice is clear. P Link to comment Share on other sites More sharing options...
John Salim Posted September 24, 2011 Share Posted September 24, 2011 This is definitely not true for all types of IR LED. I've seen infra-red emitters for things like auditorium sound systems (for people with hearing problems) in cinemas and theatres emit really quite a lot of very deep red visible light. So, this could be a dangerous assumption. There are, I believe, near IR and deep IR types, and the choice is clear. P As it happens I've seen cinema 'IR' emitters with a deep, dark red light too Phil, so maybe they use different types of LED's ( with a wider bandwidth ) for maximum coverage ? 'Proper' IR LED's start to radiate from 880nm peaking at around 940nm whereas most colour and B&W film will be sensitive up to around 700nm - 750nm. John S Link to comment Share on other sites More sharing options...
Jock Blakley Posted September 24, 2011 Share Posted September 24, 2011 One set-up I once saw used IR-pass filters from still photographic suppliers (may have been Hoya, but a few years have passed now) over the emitters... seemed to work fine. Link to comment Share on other sites More sharing options...
John Salim Posted September 24, 2011 Share Posted September 24, 2011 One set-up I once saw used IR-pass filters from still photographic suppliers (may have been Hoya, but a few years have passed now) over the emitters... seemed to work fine. Actually you can use several layers of unexposed and processed reversal film over a lamp to use as an IR light source. John S Link to comment Share on other sites More sharing options...
Ron Varga Posted September 24, 2011 Share Posted September 24, 2011 (edited) Hi everybody, Just as said in the tittle, i was wondering if loading 50' B&H magazines under infrared camera is possible without causing damage to the film ? B&H magazines are very special and very difficult to load it without looking just a bit... I poligise for my poor english. Philippe It's alway's best to put into practice loading a mag without using any special lighting equipment. Just practice it till you know it like your toothbrush. Also, you have to ask yourself; "What if I don't have any special light to aid me in loading the magazine?" You have to know your tools. Edited September 24, 2011 by vargavision Link to comment Share on other sites More sharing options...
Philippe Lignieres Posted September 25, 2011 Author Share Posted September 25, 2011 Thanks everybody for so many answers. I will try ASAP. Of course it is better to know how to load a magazine, BUT B&H 50' magazine are VERY special ones, very little and quite uncomfortable to load. In fact, i have seen a big black charging box with a IR camera in it at a military base where missiles were filmed by high speed cameras. And, of course, somme problems of jamming, I suppose... But I was wondering if it would be very special military camera, or standard. So, I will buy a cheap IR led camera, and see what happen... In case it's easy to do, B&H 50' magazine cameras could be a poor man Ikonoscop...! Link to comment Share on other sites More sharing options...
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