Elliott J Posted October 21, 2009 Share #1 Posted October 21, 2009 Advertisement (gone after registration) Hi. I have recently started shooting film again. When switching lenses between my M8 and M6, do I have to concern myself about removing the UV IR filter? If I do not remove it, what is the effect on my film? If anyone has any experience with this could they please share their thoughts? Thanks. Link to post Share on other sites More sharing options...
Advertisement Posted October 21, 2009 Posted October 21, 2009 Hi Elliott J, Take a look here UV IR filter on Film. I'm sure you'll find what you were looking for!
tgray Posted October 21, 2009 Share #2 Posted October 21, 2009 Yes, don't use them on film. Well, color film. You will get the cyan corners on photos taken with wide angle lenses. You might not mind on B&W, but it will show up as vignetting. Link to post Share on other sites More sharing options...
Elliott J Posted October 21, 2009 Author Share #3 Posted October 21, 2009 Hi. Thanks. I guess I will have to do a test. Didn't realize that would have that effect??? Thought the "color shift" was not as a result of the IR on an M8, but rather because of the proximity of the rear element of the lens relative to the sensor? The filter, I thought was being used to correct for problematic color shift in blacks under mixed light sources. If anyone can help clarify it would be greatly appreciated. ej Link to post Share on other sites More sharing options...
tgray Posted October 22, 2009 Share #4 Posted October 22, 2009 It has to do with the angle of light that comes through the front of the filter. These filters are interference filters and work by having a carefully prepped number of coatings that are precisely placed fractions of a wavelength apart from each other (on the order of a couple hundred nanometers). Or something like that Regardless, as the angle of incidence changes from the front of the filter, the wavelengths they filter changes. That's the problem with wide angle lenses; the light is hitting the front of the filter at an angle other than perpendicular, changing the wavelength that is filtered. So, the M8 needs the filters because the chip has a weak IR filter on it, and thus needs a filter on the front of the lens to filter out IR (which causes the magenta color of some black materials), but the cyan corners thing is a purely optical effect, and will affect any capture medium. Actually, if you hold the filter up to your eye and change the angle, I'm sure the color changes. It probably looks reasonably clear perpendicular and reddish at larger angles. Wiki - interference filters Link to post Share on other sites More sharing options...
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