leicajh Posted May 31, 2008 Share #21 Posted May 31, 2008 Advertisement (gone after registration) Im sorry, but even after reading these threads, I dont know how to shoot i/r. I have an ir/uv cut filter, Is there after shooting processing? Thank you. jh Link to post Share on other sites More sharing options...
Advertisement Posted May 31, 2008 Posted May 31, 2008 Hi leicajh, Take a look here Can the M8 do infra red photography?. I'm sure you'll find what you were looking for!
fefe Posted May 31, 2008 Share #22 Posted May 31, 2008 You need an IR pass filter like those and remove your current IR block filter: filter IR 093 | B&H Photo Video or these B+W IR filter | B&H Photo Video You also need to focus differently, using the f5.6 mark on your lense as the distance reference usually gives good results (the right one). The way I do it is focus with the rangefinder, and then look at the focusing scale and move the current selected point of focus in front of the f5.6 mark in the DOF scale. Many lenses have a hot-spot in IR which means the center of the picture will gather a lot more IR left than the corners. Here is a result I got last week with a 35 cron asph (handheld): Link to post Share on other sites More sharing options...
leicajh Posted May 31, 2008 Share #23 Posted May 31, 2008 Thank you so much. jh Link to post Share on other sites More sharing options...
rwfreund Posted May 31, 2008 Share #24 Posted May 31, 2008 Exposure compensation seems to depend on the amount of light at varying parts of the spectrum. I have found that I need to set exposure comp to about -2ev when I shoot before dawn and -0 to +0.5 when shooting with daylight while using the 093 filter. I am guessing that the photo diode used for exposure evaluation is somewhat more sensitive to ir than the sensor. When there is a smidgen of non-ir as is passed by the 093, the camera exposes more right than wrong, but when it is dark except for residual, probably longer wave ir, then it tends to over-expose. -bob Link to post Share on other sites More sharing options...
rwfreund Posted May 31, 2008 Share #25 Posted May 31, 2008 If you do see a hot spot, it will mostly be in the blue channel. For monochrome ir, in PS, convert to monochrome using only the red channel and then most of the hot spot will go away. -bob Link to post Share on other sites More sharing options...
rwfreund Posted May 31, 2008 Share #26 Posted May 31, 2008 This is an example of a pre-dawn ir shot used for luminance and blended with a visitble light image for color in ps Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! -bob Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! -bob ' data-webShareUrl='https://www.l-camera-forum.com/topic/23834-can-the-m8-do-infra-red-photography/?do=findComment&comment=571786'>More sharing options...
gravastar Posted May 31, 2008 Share #27 Posted May 31, 2008 Advertisement (gone after registration) If you do see a hot spot, it will mostly be in the blue channel.For monochrome ir, in PS, convert to monochrome using only the red channel and then most of the hot spot will go away. -bob This link will give you a list of which lenses do and don't show hot spots. In many cases the hot spot is most noticeable if the lens is stopped down. Bob. Link to post Share on other sites More sharing options...
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