Need for Circular Polarizer?
Nov 17, 2012 22:14:57 #
Provided I am using manual focus, is there any reason a conventional, or linear, polarizer will not work just fine on my DSLR ? It's always been my understanding that a conventional polarizer interferes with auto focus systems.
Thanks.
Thanks.
Nov 17, 2012 22:56:51 #
Simply put...linear polarizers play havoc on the internal workings of metering and auto-focus of today's DSLRs. Circular polarizers are the "fix", and are actually composed of 2 layers; a linear polarizer and a wave plate. I better stop now before getting too techie.
Nov 17, 2012 23:28:02 #
_Rex wrote:
Simply put...linear polarizers play havoc on the internal workings of metering and auto-focus of today's DSLRs. Circular polarizers are the "fix", and are actually composed of 2 layers; a linear polarizer and a wave plate. I better stop now before getting too techie.
A Google search will give you more info on this topic than you will want to read. Until a few months ago, I thought a CPF was called circulate because of the shape. :oops:
Nov 17, 2012 23:40:23 #
Thanks Rex and JerryC. I'm going to a used photo equipment show tomorrow and was thinking about picking up a linear polarizer and a graduated ND filter for my film cameras and was wondering if the polarizer would work for the DSLR as well. Will check out Google tonite.
Nov 18, 2012 00:07:33 #
I concur with both above assessments. Read more here:
FAQ: Photographic Filters
http://www.uglyhedgehog.com/t-26502-1.html
FAQ: Photographic Filters
http://www.uglyhedgehog.com/t-26502-1.html
Nov 18, 2012 00:43:08 #
After doing a little Google research, I see that not only is focus altered, so is exposure. So...I will look for a circular polarizer tomorrow at the photo show. Forgot to mention earlier that somehow I lost my Hoya 77mm CPL recently, darned thing cost around $100 as I recall, need to replace it.
Nov 18, 2012 00:55:12 #
Don't waste your $ on a linear...the circular will work fine for both film & digital.
Nov 18, 2012 01:03:28 #
jackm1943 wrote:
A lens alters the direction of light, but a filter changes only the color of light. The proper term is Circular Polarizing Filter, or CPF.I lost my Hoya 77mm CPL recently . . .
Nov 18, 2012 05:28:06 #
Nov 18, 2012 08:34:24 #
Take the time to check out B&H for the lens. You can get a used B&W for a good price and the company is top notch.
Pappy
Pappy
Nov 18, 2012 09:49:13 #
Nov 18, 2012 10:03:06 #
Those replies were extremely helpful. Thanks!!!! Back in the old days of slide film I used to occasionally use a linear polarizer and on a trip to Niagara Falls I cut out the rainbow generated by the falls and when I moved the polarizer in another direction the rainbow came back. It was very helpful in that regard- depending of course upon the type of photo you wanted.
Nov 18, 2012 15:41:16 #
Thnx for the comments. I found a Tiffen CPF today at the camera show. $50 for like new used filter .
Nov 18, 2012 18:04:26 #
jackm1943 wrote:
Excellent! You can also use a CPF with a ND filter to increase ND, for extended time exposures.I found a Tiffen CPF today at the camera show. $50 for like new used filter .
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