On Oct 9, 2010, at 1:53 PM, Brian Walters wrote: > On Sat, 09 Oct 2010 16:21 -0400, "Eric Weir" <[email protected]> > wrote: >> >> On Oct 9, 2010, at 3:31 PM, Larry Colen wrote: >> >>> If you're shooting outdoors, it can be very handy to have a polarizer. Not >>> that the polarizer won't work as well to bring out the clouds shooting >>> either directly into, or directly away from the sun as it will shooting at >>> 90 degrees. I.e. late afternoon, west and east wont work as well as north >>> and south. >>> I'd recommend getting one and playing with it. Here are some shots from my >>> doing just that: >>> http://www.flickriver.com/photos/ellarsee/sets/72157603433853310/ >> >> Quite a difference in the shots of the tree especially. >> >> I just bought a p3n that came with an a 50/2 lens with a Skylight 1A >> filter on it. Is that a polarizer? >> >> I already had a UV[O] and PL filter. In the now distant past I knew what >> they were for. Are they both polarizers? > > > The PL probably is. The others aren't. > > Polarizing filters are dark - like a neutral density filter. There are > two types - linear and circular (those names have nothing to do with the > shape of the filter as both types are usually circular in shape). >
UV, and skylight filters are clear. They nominally block out UV light that would focus differently than visible light, and expose film our of focus, causing a slight blurriness. These days they mostly serve two purposes: 1) Protect the surface of the lens, being cheaper and easier to replace. 2) Cause weird reflections when shooting very bright objects against dark backgrounds as the light bounces off the surface of the lens, then back off the UV filter and into the lens at some other random place. -- Larry Colen [email protected] sent from i4est -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
