Archived posting to the Leica Users Group, 2007/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Philippe, funky indeed sadly I have built in IR-cut filters in my eyes... LOL makes you think of all the funky colors we're loosing outside our usual spectrum... Ed El 13/12/2007, a las 15:18, Philippe Orlent escribi?: > Hi Ed, > And there I was thinking: those are damn funky bags... > Philippe > > > > Op 13-dec-07, om 15:38 heeft Eduardo Albesi het volgende geschreven: > >> Vick, >> >> There are noticeable color differences between using and not using >> the IR cut filters. The degree of how much noticeable this effect >> is depends on the particular lighting conditions of each scene. >> There are light sources that are more IR rich than others, as >> tungsten and halogen lamps. The sun is another high power IR >> emitter, but the high emissions in the rest of the visible >> spectrum tend to mask the IR artifacts of the M8. >> Fluorescent light lacks typically IR emission in the M8 critical >> band, so there's no problem under them. >> >> The following samples are under halogen light, with and without >> filter, I think it cannot get worse than this: >> http://gallery.leica-users.org/v/Fuchs/tech_001/IRNightmare1.jpg.html >> >> But it is effectively solved by the use of filters: >> http://gallery.leica-users.org/v/Fuchs/tech_001/IRNightmare2.jpg.html >> >> Filter used is a B&W 486 UV/IR Cut filter. The lens is an Elmarit- >> M 28/2.8 asph. >> Both files shot in DNG, converted to JPG in Adobe Camera Raw (PS >> CS3). >> >> There is another IR contamination effect that affects the M8: a >> soft focus 'glow' under certain circumstances. This latter effect >> is caused by the superposition of a focused visible-spectrum image >> and an out of focus IR image (remember that the IR plane of focus >> is slightly offset from the visible plane of focus, hence the >> different focusing IR mark on older lenses). This has been >> extensively exposed on other fora, especially the LUF. >> >> So, just color correcting the files does not solve the IR issue. >> But with high quality IR filters (B&W, Heliopan or Leica) you >> don't have any side effects, and the increased color and focus >> precision you get are worth their use. BTW, I have never noticed >> any image quality degradation using either brand. >> >> So, just mount them on every one of your lenses, forget about them >> and enjoy the camera, one of the very best out there. >> >> Ed >> >> >> >> >> El 13/12/2007, a las 08:32, Vick Ko escribi?: >> >>> So, is there consensus on using IR filters on the M8, on lenses >>> without >>> coding? >>> >>> I've searched the archives a bit, and get the perception: >>> * using the filter does degrade the image slightly >>> * it does work, but the magenta flaw happens only under pretty >>> severe >>> conditions anyway >>> * for the majority of photo conditions, the filter isn't necessary >>> >>> I've been tempted with an M8, from a very reliable source and >>> very tempting >>> conditions. >>> >>> >>> ....Vick >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >