Archived posting to the Leica Users Group, 2008/11/08[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]
Hi Eric, > Date: Fri, 07 Nov 2008 20:58:03 +0000 > From: Eric Calderwood <email@example.com> [snip] > Yes, both B+W and Heliopan, as well as Leica of course, both make UV/IR Cut > Filters. > Leica recommend their use on lenses 35mm and wider. No, it's a bit more complicated. First, using or not an IR blocking filter, does not depend on focal length but on the scene. It will usually make a difference in interiors (incandescent light) where dark synthetic clothes would appear reddish without the filter. Second, using an IR blocking filter tends to give a different colour balance between the centre and the periphery of the picture, which is only noticeable when using a lens 35mm or wider. Therefore, if using a lens 35mm or less AND an IR blocking filter, it is necessary to use the 6-bit code which allows the M8 firmware to make the colour balance correction corresponding to the lens used, and adjust the menu settings accordingly. In other words, when I shoot outside (natural light), I never use any IR blocking filter even with the 21mm or the CV 15mm. Inside, e.g. taking pictures at theatre stages, I use an IR blocking filter even with the 50mm. Jean .