jip Posted December 2, 2014 Share #1 Posted December 2, 2014 Advertisement (gone after registration) I have lots of UV/IR filters in all sorts of sizes and have used them digital on the M8 ofcourse and later on the M9 and now M240, without any problems... but is it okay to use these on film as well? Or does the film 'need' the IR light?! Thanks!! Quote Link to post Share on other sites More sharing options...
Advertisement Posted December 2, 2014 Posted December 2, 2014 Hi jip, Take a look here UVir filters on film. I'm sure you'll find what you were looking for!
xalo Posted December 4, 2014 Share #2 Posted December 4, 2014 Hi Jip, back in the forum archives of the M8's heydays you may find a more cogent answer, but I refrain from using UV/Ir fiters (for RD-1) on film. It's not so much that films need Ir; as far as I now, besides true Ir film, only very few b&w emulsions are significantly sensitive to this part of the spectrum. But on colour, I would think that the tint is going to show on slides for sure, probably also on negatives (through colour shifts). For black and white this may not play, but I have the feeling that the filters are more prone than others to flare and ghosting. So while more and more often I take even the UVa off for this reason, the UV/Ir would be the last I'd use to replace it. Since all this is based on intuition and more or less random observation with various lenses, it would require some fact check. I may actually do a test on a few frames of Provia I have in one camera. But that may take a bit of time... Cheers, Alexander Quote Link to post Share on other sites More sharing options...
pico Posted December 4, 2014 Share #3 Posted December 4, 2014 I have lots of UV/IR filters in all sorts of sizes and have used them digital on the M8 ofcourse and later on the M9 and now M240, without any problems... but is it okay to use these on film as well? Or does the film 'need' the IR light?! Thanks!! We have been using color film without the UV/IR filters since it was invented. No need for them. . 1 Quote Link to post Share on other sites More sharing options...
jaapv Posted December 4, 2014 Share #4 Posted December 4, 2014 IR-cut (hot) filters existed long before digital was invented. Normally you would not need them as film in general has a rather low sensitivity to IR light, but in some high-IR lighting conditions they certainly have a use. Quote Link to post Share on other sites More sharing options...
NB23 Posted December 4, 2014 Share #5 Posted December 4, 2014 Are you crazy?? Never use a uv/ir cut with color film! You'll get color casts all over. Quote Link to post Share on other sites More sharing options...
jip Posted December 4, 2014 Author Share #6 Posted December 4, 2014 Color casts? I thought the colour cast they exhibited on the M8 was due to the angle of attack of the light on the sensor, I can't imagine that happening on film really?! Quote Link to post Share on other sites More sharing options...
jaapv Posted December 4, 2014 Share #7 Posted December 4, 2014 Advertisement (gone after registration) They shift the result on film to Green/Cyan which can be nasty. So only use them when you do get a colour shift due to too much IR which exceeds the threshold of the film - which is quite rare. Quote Link to post Share on other sites More sharing options...
xalo Posted December 4, 2014 Share #8 Posted December 4, 2014 Film does not AT ALL work the same way as a sensor. It reacts chemically to (usually mostly visible) parts of the light spectrum. When you filter, i.e. retain, a part of the spectrum this will show on the film. Without going to far into detail now, but on slides you will see a cast (roughly) the colour of the filter; on a negative it's inverted colour, making then the filters colour again visible on colour the print. The UV/Ir filters do have a distinctive tint that will show — and perhaps also be used creatively, but that's another matter. Alexander Quote Link to post Share on other sites More sharing options...
NB23 Posted December 4, 2014 Share #9 Posted December 4, 2014 Color casts? I thought the colour cast they exhibited on the M8 was due to the angle of attack of the light on the sensor, I can't imagine that happening on film really?! That's a myth created by digital folks that actively participate in photo Forums, but don't actually practice photography. Same myth as the "diffraction limit vs megapixels" and "more pixels contribule to show more movement". A ir cut filter will wreck your film color shots Quote Link to post Share on other sites More sharing options...
pico Posted December 5, 2014 Share #10 Posted December 5, 2014 That's a myth created by digital folks . [...] Explain the 'Italian flag' effect. Quote Link to post Share on other sites More sharing options...
NB23 Posted December 11, 2014 Share #11 Posted December 11, 2014 Explain the 'Italian flag' effect. The Italian Flag effect was also present on my old D2H. Quote Link to post Share on other sites More sharing options...
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