Archived posting to the Leica Users Group, 2010/09/04
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Rei I recall the last filter kerfuffle as well. I have lens hoods fitted routinely also, partly for their original purpose and partly for the mechanical protection that they offer too. On the Summilux 50 ASPH that I use a lot, there is a small collapsible hood permanently attached. Mine sometimes unlocks in handling. I won't repeat the rest ;-) I'm actually looking for a couple of those heliopan UV-MRC slim filters, if you wanted to talk to me off list on that. Cheers Geoff http://www.pbase.com/hoppyman On 5 September 2010 01:24, Rei Shinozuka <shino at panix.com> wrote: > it feels like years since the last filter kerfuffle. > > as for myself, in 2007 i swapped heliopan UV-MRC Slims for leica UV-IRs and > in 2009 i switched back. > > -rei > > > > On 09/04/2010 02:52 AM, Henning Wulff wrote: > >> At 9:45 AM +1000 9/4/10, Geoff Hopkinson wrote: >> >> Why do you think that the filters would likely shatter into a million >>> ultra >>> sharp pieces? Good ones at least are laminated materials. >>> >>> >> 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. >> >> > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >