Archived posting to the Leica Users Group, 2007/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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