Circular Polarizer on Wide Angle
Feb 22, 2013 13:17:05 #
BlokeOzz wrote:
Greg, aim your camera at your computer monitor, Rotate the polarizer until the view through your viewfinder turns Black mark the position on the filter, this is full polarization 90 degrees back from that is normal and of course rotating between these 2 settings is either more or less polarization
Ok, I did that and you are correct. Now how does that translate to how to turn it relative to the sun. For example:
A mark on my CP is at the 3 o'clock position and when pointed at the computer, the screen is black.
I go outside to shoot a landscape. The sun is to my left, low in the sky, let's say at the 10 o'clock position (figuring the horizon on my left is at 9 o'clock.) Where do I put that mark on my lens relative to the sun (assuming I want the maximum polarization.)
Thanks in advance,
Greg
Feb 22, 2013 18:31:39 #
wizbird
Loc: Burnt Store Marina, Punta Gorda, Fl
While the picture looks good it is not natural. Looking at it you can tell a CP was used. That is not a desirable result. I have a CP with my Sigma 10-20 3.5. What I do is take 2 photos. One with and one without the CP. That way I have a choice. Shooting in RAW gives more options when using editing software.
Feb 22, 2013 20:27:36 #
GregWCIL wrote:
Karl, you reminded me of another question I have about circular polarizers:
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
That's really the only way TO tell. :thumbup:
Feb 22, 2013 23:43:56 #
Greg, if you marked the top of your filter when your screen was black, this is full polarization if you rotate to 3 o'clock then you will be in normal position, no polarization and anywhere between those 2 settings is either more or less polarization it can be damned annoying with a lot of filters, there is no mark on them to show you where polarization is, one of mine has a white mark, and when this is at the top, there is no polarization, and when I rotate to 3 o'clock I have full polarization. hope this helps.
Ian
Ian
Mar 1, 2013 13:17:07 #
GregWCIL wrote:
Karl, you reminded me of another question I have about circular polarizers:
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
If you shoot at 90 degrees relative to the sun, you'll get the greatest effect. The farther you get from that angle, the less the effect. Looking through the viewfinder and turning the polarizer is the only way to judge the effect.
Mar 1, 2013 13:32:37 #
jerryc41 wrote:
If you shoot at 90 degrees relative to the sun, you'll get the greatest effect. The farther you get from that angle, the less the effect. Looking through the viewfinder and turning the polarizer is the only way to judge the effect.
GregWCIL wrote:
Karl, you reminded me of another question I have about circular polarizers:
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
If you shoot at 90 degrees relative to the sun, you'll get the greatest effect. The farther you get from that angle, the less the effect. Looking through the viewfinder and turning the polarizer is the only way to judge the effect.
Jerry that's basically what I stated. The suggestion for marking the filter may work but there's nothing like seeing the effect through the viewfinder. With a rangefinder type camera that's not an option though. The angle of light is very important as you mentioned. :thumbup:
Mar 2, 2013 12:33:09 #
GregWCIL wrote:
Karl, you reminded me of another question I have about circular polarizers:
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Most polarizers have a dot or arrow on the edge, when this indicator is pointed in the sun's direction, you get the most effect.
Mar 2, 2013 12:34:04 #
wlgoode wrote:
Most polarizers have a dot or arrow on the edge, when this indicator is pointed in the sun's direction, you get the most effect.
GregWCIL wrote:
Karl, you reminded me of another question I have about circular polarizers:
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Most polarizers have a dot or arrow on the edge, when this indicator is pointed in the sun's direction, you get the most effect.
Now that's good to know. :thumbup:
Mar 2, 2013 14:57:48 #
wlgoode wrote:
Most polarizers have a dot or arrow on the edge, when this indicator is pointed in the sun's direction, you get the most effect.
GregWCIL wrote:
Karl, you reminded me of another question I have about circular polarizers:
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Is there a trick to tell how to turn one to get the most affect? I find it hard to tell through the viewfinder.
Most polarizers have a dot or arrow on the edge, when this indicator is pointed in the sun's direction, you get the most effect.
I had never noticed that. Today in my area it's solid overcast so hard to check but the info is useful. Thanks for pointing that out. :thumbup:
Mar 10, 2013 13:37:37 #
RichieC
Loc: Adirondacks
The polarizer cuts out haze, it allows the color to come through... "cleaner", with more detail. You can take the enhanced effect back out with post processing much more easily then you can add it in. . This is the direction I would prefer to approach this "problem" in.
Mar 13, 2013 20:50:57 #
GregWCIL wrote:
Since circular polarizers affect color depending on the angle relative to the sun, usually you read they shouldn't be used with a super wide angle lens. Is there something I can do in post processing if I want the sky to be more uniform?
The Photoshop Guys just did a little demo on how to avoid this effect on the sky but keep the CP benefit on the landscape.
http://kelbytv.com/photoshopusertv/2013/03/06/episode-337/
Mar 14, 2013 10:37:53 #
I have noticed that photographers, new to the sport, get bombarded with "the rules" and some more experienced photographers can get a bit dogmatic about them. In this case, that polarizers work best at 90 degrees to the sun. That is true for sky darkening due to the polarization of reradiated light. But is not so for reducing reflections from water or glass. This article does a good job explaining it if you are interested:
http://www.cameratechnica.com/2011/04/10/the-science-of-polarizing-filters/
http://www.cameratechnica.com/2011/04/10/the-science-of-polarizing-filters/
Mar 17, 2013 00:44:56 #
If you have photoshop you can apply a graduated filter in camera raw or in regular Photoshop. In camera raw it is real easy to adjust the filter exactly how you want it.
Mar 25, 2013 08:13:32 #
wizbird
Loc: Burnt Store Marina, Punta Gorda, Fl
I use one on my Sigma 10-20 F3.5. You are right the sky is not uniform. Can be a problem. But it does so much more that it is still a needed addition. ND filters also good addition to wide angle kit.
Mar 26, 2013 01:13:50 #
wizbird wrote:
I use one on my Sigma 10-20 F3.5. You are right the sky is not uniform. Can be a problem. But it does so much more that it is still a needed addition. ND filters also good addition to wide angle kit.
Very wide angle lenses will show a wide variance in sky polarization. The angle of view is so wide that the dark sky is near 90 degrees and the edges are far from 90 degrees
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