> Since the angle from the sun determines the amount of > polarization, you will have uneven polarization of the sky using a > super wide lens, not to mention vignetting with even the thinnest > of filters.
Good point, Bill. Using a polarizing filter on the A 20/2.8 doesn't cause vignetting (due to the clever flaring out of the filter mounting flange in front), but sometimes (depending on the angle of the sun and of the lens) there is indeed a problem in trying to end up with polarization of the sky that doesn't look too uneven. And that's only at 20mm... Fred - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
