Archived posting to the Leica Users Group, 2008/11/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Yes, Of course Jean, I was thinking of the lens coding with regards to vignetting with lenses of 35mm and wider. The UV/IR filters are required for all lenses for correct colour rendition. Eric On 08/11/2008 20:40, "Jean Louchet" <jean.louchet@gmail.com> wrote: > Hi Eric, > >> Date: Fri, 07 Nov 2008 20:58:03 +0000 >> From: Eric Calderwood <eric.calderwood@btinternet.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 . > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information