Archived posting to the Leica Users Group, 2010/09/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]What I don't really understand is why does anyone need to justify either decision to someone else and how someone's opinion or "100% of PROs" opinions should have any weight on anyone else. I am just glad that we still live in a (mostly) a free country :-) On Fri, Sep 3, 2010 at 11:52 PM, Henning Wulff <henningw at archiphoto.com>wrote: > > > At present only polarizers are still sometimes laminated; most others are > dyed in the mass. The latter would shatter. > > In earlier times coloured filters were laminated because the dyes could be > controlled better in gel form than as dyes added to molten glass. They were > abandoned when dyed in the mass became possible because the gels tended to > fade relatively quickly, and they necessitated thicker filters which caused > a lot of plano-parallelism problems. I once (in the 70's) checked about 50 > filters; over 75% of the laminated gel types had surfaces that weren't > perfectly parallel which would cause serious problems with some lenses. The > gels also didn't really provide any structural strength; not like the vinyl > in laminated safety glass. > > As far as the UV filter argument goes, the filter ring ding vs. lens rim > ding I can understand, but my lens shades do an even better job and they > shade besides. Also, if you shatter the filter after whacking the lens > against something, it does not necessarily follow that the front element > would have been damaged if the filter had not been there. Maybe yes, maybe > no. > > As you might guess from the above, I use filters when there is a good > reason, but leave it off otherwise. I did some tests once which showed that > under some circumstances the images gets slightly degraded when a filter is > used. Not often, but still... > > If you use a filter, make sure the coatings are good. It doesn't have to be > the most expensive one. > > -- > > * Henning J. Wulff > /|\ Wulff Photography & Design > /###\ mailto:henningw at archiphoto.com > |[ ]| http://www.archiphoto.com > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- // richard <http://www.imagecraft.com/> // icc blog: <http://imagecraft.wordpress.com> // photo blog: <http://www.5pmlight.com> [ For technical support on ImageCraft products, please include all previous replies in your msgs. ]