Wolfgang Esslinger Posted November 22, 2011 Share #1 Posted November 22, 2011 Advertisement (gone after registration) Sorry to bother with an old problem but I am apparently too stupid for the forum's search function. The photo was shot with an M8 and 24 lux with IR/UV filter at 320 ISO. On this and several similar photos I have this blue reflection. Any idea - how I can avoid it in future - how I can get rid of it? Does the M9 have the same problem? Thank you for your help. Link to post Share on other sites More sharing options...
Advertisement Posted November 22, 2011 Posted November 22, 2011 Hi Wolfgang Esslinger, Take a look here unwanted reflection. I'm sure you'll find what you were looking for!
Erik Gunst Lund Posted November 22, 2011 Share #2 Posted November 22, 2011 looks like a reflection from the lamp, of the shiny surface of the sensor onto the inside of the filter. reposition yourself according to the lamp, use a longer lens hood or remove the filter... Link to post Share on other sites More sharing options...
jaapv Posted November 23, 2011 Share #3 Posted November 23, 2011 This is a normal green reflection of the IR filter. Specular highlights have a habit of doing that. To correct this one in postprocesing is extraordinary simple. In CS5 one swipe with the healing tool, in CS4 or lower ten seconds with the cloning stamp. Link to post Share on other sites More sharing options...
lct Posted November 23, 2011 Share #4 Posted November 23, 2011 Ghost image caused by the filter. You won't have this problem with the M9, if you don't use a filter of course. Link to post Share on other sites More sharing options...
brill64 Posted November 23, 2011 Share #5 Posted November 23, 2011 with lots of indoor artificial lighting like this that does cause internal reflections with the filter on, i often just took the uv/ir off with negligible effect to the colour balance that could be corrected later. only in certain lighting conditions outdoors and with some subjects wearing certain artificial fabrics, things were sometimes affected. since you can roughly check on the monitor, i found it worked okie. i'll probably get caned for saying that Link to post Share on other sites More sharing options...
jaapv Posted November 23, 2011 Share #6 Posted November 23, 2011 No you won't:p It all depends on the amount of IR in the ambient light. Fluorescents like these are not too bad without filter ( but can be difficult because they have a discontinuous spectrum) but flash or tungsten light, or an open fire will produce casts that are impossible to correct - well, maybe one can try to correct by shifting colors in LAB but don't count on it. For instance Caucasian skin will turn horribly splotchy and veined under IR-rich light. Link to post Share on other sites More sharing options...
brill64 Posted November 23, 2011 Share #7 Posted November 23, 2011 Advertisement (gone after registration) whoops! ignore everything i just said:p Link to post Share on other sites More sharing options...
Shade Posted November 24, 2011 Share #8 Posted November 24, 2011 Normal green reflection with an IR absorbing filter. Remove the filter during night time and you'll be just fine. Link to post Share on other sites More sharing options...
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