Archived posting to the Leica Users Group, 2008/06/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Jun 17, 2008, at 4:04 PM, leo wesson wrote: > 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. that the way I handle the problem too Leo, Steve > > > 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 > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information