Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
04-19-2011, 08:28 AM   #1
Forum Member
dwhopson's Avatar

Join Date: Jan 2008
Location: Greensboro, NC
Posts: 76
filter factor for circular polarizer

I can't seem to find an answer to this through search functions....

Is there a "general" filter factor for circular polarizers?

The reason I ask, is that I mounted one on my FA 50/1.4 with my new Kx and was sort of shocked at how the camera reacted when aimed at a brightly lit window. Auto ISO went to 800 and aperture set to 1.4. I know I was inside...or am I just being naive about this particular situation.

I know generally you wouldn't use a polarizer inside...unless you had a really, really bad surface glare problem and lots of light.


04-19-2011, 09:08 AM   #2
Site Supporter
SpecialK's Avatar

Join Date: Dec 2006
Location: So California
Photos: Gallery
Posts: 14,849
Generally, 1 to 2 stops.
04-19-2011, 04:18 PM   #3
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
The amount of light reduced by the filter changes with its orientation. If the image is too dark or light, give the filter a twist.
04-19-2011, 04:25 PM   #4
Site Supporter

Join Date: Sep 2006
Location: WV
Posts: 1,493
Shoot in manual mode. That way, you control the camera rather than allowing the camera to control you.


  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
factor, filter, k-mount, pentax lens, polarizer, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale - Sold: B+W 52mm Circular Polarizer F-Pro Filter (US/CAN) suzuki-j Sold Items 2 05-10-2010 12:10 AM
Circular Polarizer Glass Filter 77S PL-CIR robma47 Troubleshooting and Beginner Help 2 04-05-2010 03:44 AM
For Sale - Sold: Tiffen 82 mm circular polarizer filter TaiChiTom Sold Items 2 07-14-2009 08:58 PM
For Sale - Sold: FS: SunPak 49mm Circular Polarizer Filter Ralph Wagner Sold Items 2 05-25-2007 04:51 PM

All times are GMT -7. The time now is 08:16 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]