Archived posting to the Leica Users Group, 2008/06/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I have to pipe in here with a comment about IR filters. They solve certain problems but I find that they degrade the image quality significantly if there is a window or light source due to that good old problem, flare, which isn't a problem with leica/cv glass if you aren't using filters. I also find them to be way too fragile for my liking, I'm noticing haze and scratches after only about 3 or 4 months. I find myself not using them at all these days and consequently not using my m8 if there is a situation where I would get that unpleasant purple black nonsense. leo On Tue, Jun 17, 2008 at 5:57 PM, Lottermoser George <imagist3@mac.com> wrote: > thanks for the clarifying metaphor. > when filters are used in front of the sensor/lens the buckets will hold > different data than unfiltered data. > got it makes sense. > quite the same as film. > if the data isn't there you can't put it there later. > > Fond regards, > George > george@imagist.com > www.imagist.com > http://www.imagist.com/blog > Picture A Week - www.imagist.com/paw_07 > > > > On Jun 17, 2008, at 5:44 PM, Henning Wulff wrote: > > The basic point is that the spectral information is divided into three >> classes, R, G and B and collected in buckets. After that there are only >> limited means of separating the photons (and translated charge values) and >> their qualities into their smaller divisions, and that only by comparing >> what's in one bucket to what's in the adjacent buckets. Software/firmware >> can do no more. Putting filters in front of the lens whether IR cut or red >> makes the sorting of information by software a lot easier, as certain >> variables get reduced in value. >> >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- Leo Wesson Photographer/Videographer 817.733.9157