CP rotation
Feb 7, 2012 20:53:43 #
How does rotating the lense work? Don't want to sound innerent,but I know nothing about this filter.
Thanks
Thanks
Feb 7, 2012 21:49:24 #
FAQ: Photographic Filters
http://www.uglyhedgehog.com/user_page.jsp?upnum=235
A Circular Polarizing Filter (CPF), used for both color and black-and-white photography, is colorless and does not affect color balance, but filters out light with a particular direction of polarization. This reduces oblique reflections from non-metallic surfaces, can darken the sky in color photography (in monochrome photography colour filters are more effective), and can saturate the image more by eliminating unwanted reflections.
Linear polarizing filters, while effective, can interfere with metering and auto-focus mechanisms in DSLRs; circular polarizing filters are also effective, but do not upset metering or auto-focus.
Read about Circular Polarizing Filters here:
http://en.wikipedia.org/wiki/Polarizing_filter_%28photography%29
http://www.uglyhedgehog.com/user_page.jsp?upnum=235
A Circular Polarizing Filter (CPF), used for both color and black-and-white photography, is colorless and does not affect color balance, but filters out light with a particular direction of polarization. This reduces oblique reflections from non-metallic surfaces, can darken the sky in color photography (in monochrome photography colour filters are more effective), and can saturate the image more by eliminating unwanted reflections.
Linear polarizing filters, while effective, can interfere with metering and auto-focus mechanisms in DSLRs; circular polarizing filters are also effective, but do not upset metering or auto-focus.
Read about Circular Polarizing Filters here:
http://en.wikipedia.org/wiki/Polarizing_filter_%28photography%29
Feb 7, 2012 23:08:16 #
Nikonian72 wrote:
reduces oblique reflections from non-metallic surfaces
While investigating why only non-metallic surfaces are affected, I came across this interesting tutorial. It discusses the nature of light with respect to reflections and polarization without getting overly technical. (No math skills needed :D )
http://www.physicsclassroom.com/class/light/u12l1e.cfm
Feb 7, 2012 23:34:38 #
Go outside in the daytime with a lens and the filter installed on the camera. Face the north. Frame a shot that includes the blue sky. Look through the viewfinder and rotate the filter installed on the lens. You should see the north sky go from light/normal blue to dark almost black as you turn the filter.
You will not see this when pointing the lens to the south.
Look at reflections on car windows and not you can control that reflection most of the time but you can't affect reflections on chrome or painted surfaces to the same degree.
The filter will have almost no affect on subjects in shade or with indirect light falling on them.
Also note that you will need to increase your exposure by 1 ~ 2 stops to compensate for the darkness of the filter.
You will not see this when pointing the lens to the south.
Look at reflections on car windows and not you can control that reflection most of the time but you can't affect reflections on chrome or painted surfaces to the same degree.
The filter will have almost no affect on subjects in shade or with indirect light falling on them.
Also note that you will need to increase your exposure by 1 ~ 2 stops to compensate for the darkness of the filter.
Feb 14, 2012 16:02:00 #
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