johnloumiles Posted July 25, 2011 Share #1 Posted July 25, 2011 Advertisement (gone after registration) I was going through some images that I took before I received IR/UV filters and I have never seen a case of magenta in any of my pictures. I've never had a filter for my Elmarit and that has not produced it either. I just took a picture in artificial light only,no filter with and a black t shirt on with no magenta cast. I switch the UV/IR on lens settings dependent on if I'm using a filter. Is there any reason for this? Link to post Share on other sites More sharing options...
Advertisement Posted July 25, 2011 Posted July 25, 2011 Hi johnloumiles, Take a look here No Magenta Cast w/o Filter. I'm sure you'll find what you were looking for!
johnloumiles Posted July 25, 2011 Author Share #2 Posted July 25, 2011 I was going through some images that I took before I received IR/UV filters and I have never seen a case of magenta in any of my pictures. I've never had a filter for my Elmarit and that has not produced it either. I just took a picture in artificial light only,no filter with and a black t shirt on with no magenta cast. I switch the UV/IR on lens settings dependent on if I'm using a filter. Is there any reason for this? Link to post Share on other sites More sharing options...
jaapv Posted July 25, 2011 Share #3 Posted July 25, 2011 Yes - the fabrics you photographed were not IR reflective. Not all black turns magenta. Link to post Share on other sites More sharing options...
jaapv Posted July 25, 2011 Share #4 Posted July 25, 2011 Yes - the fabrics you photographed were not IR reflective. Not all black turns magenta. Link to post Share on other sites More sharing options...
johnloumiles Posted July 25, 2011 Author Share #5 Posted July 25, 2011 And I understand that, I tried to find a artificial shirt as possible, half poly blend. I have seen shots where the magenta was cast over the entire image as well though. WHy does that happen? Link to post Share on other sites More sharing options...
johnloumiles Posted July 25, 2011 Author Share #6 Posted July 25, 2011 And I understand that, I tried to find a artificial shirt as possible, half poly blend. I have seen shots where the magenta was cast over the entire image as well though. WHy does that happen? Link to post Share on other sites More sharing options...
richam Posted July 25, 2011 Share #7 Posted July 25, 2011 Advertisement (gone after registration) The magenta cast occurs when you have IR in your light source, and a subject that reflects it. Try a polyester garment in sunlight with and without the IR filter and you may notice a differnece. Link to post Share on other sites More sharing options...
richam Posted July 25, 2011 Share #8 Posted July 25, 2011 The magenta cast occurs when you have IR in your light source, and a subject that reflects it. Try a polyester garment in sunlight with and without the IR filter and you may notice a differnece. Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted July 25, 2011 Share #9 Posted July 25, 2011 ... I have seen shots where the magenta was cast over the entire image as well though. WHy does that happen? Post a sample that show what you are asking about, would help a lot trying to give a cause... Thanks! Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted July 25, 2011 Share #10 Posted July 25, 2011 ... I have seen shots where the magenta was cast over the entire image as well though. WHy does that happen? Post a sample that show what you are asking about, would help a lot trying to give a cause... Thanks! Link to post Share on other sites More sharing options...
john_newell Posted July 25, 2011 Share #11 Posted July 25, 2011 Unscientific response here. I went for quite a while not having any IR issues. Over time, I began to find them cropping up. Since I had the filters, I installed them and leave them on - I don't have an M9 so there's no feeling that I need to mount/unmount the filters. I would guess that after a while you'll find the same, but if not, be thankful. I prefer not to have anything in front of the front element and the subject. Link to post Share on other sites More sharing options...
pklein Posted July 26, 2011 Share #12 Posted July 26, 2011 You can't see IR light, nor can you see what reflects it. So there are often surprises without the filters. Bright sunlight has a higher propoertion of IR in it than a cloudy sky, and incandescent bulbs have even more. So we can guess that it might be safe to shoot without a filter on a cloudy day. We' often be right, but every so often the camera is going to see something we don't. Leica talks about black synthetics, but that is a reasonable generalization with marketing overtones. It isn't just black synthetics. Take two different black T-shirts, and one may photograph black or only slightly brownish, the other might be very purple. Also, magenta is not the only reason for the IR filters. Green grass and foliage reflects a lot of IR, and that can shift it toward yellowish. Skin can turn whiter or reddish without the filter, and you see blood vessels more prominently. Link to post Share on other sites More sharing options...
johnloumiles Posted July 27, 2011 Author Share #13 Posted July 27, 2011 Thank pklien, Your answer was the one I was looking for. I knew I had seen a photo in a dense jungle where the whole image was off. Being from California I don't see a lot of cloudy days so that must be the reason I've been lucky so far. Thanks! Link to post Share on other sites More sharing options...
Xmas Posted August 1, 2011 Share #14 Posted August 1, 2011 Hi There should be more IR, with clear sky than with clouds, the clouds block the IR. The IR filters dont work really well with wide angle lenses, or with sun (or light source) close to frame edge. You may get magenta without filter or bad flare with filter. Noel Link to post Share on other sites More sharing options...
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