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Here is the exif data of your photo:
Date Time Original: 2014:10:13 08:37:09
Exposure Time: 1/20
F Number: f / 20
Exposure Program: Shutter priority
ISO Speed Ratings: 100
Metering Mode: Pattern
Flash: Flash did not fire, compulsory flash mode
Focal Length: 16mm
White Balance: Manual white balance
Model: Canon EOS 6D
LensInfo: 16/1 35/1 0/0 0/0
LensModel: EF16-35mm f/4L IS USM
Lens: EF16-35mm f/4L IS USM
Color Space: 1
Date Time Digitized: 2014:10:13 08:37:09
Subsec Time Original: 00
Subsec Time Digitized: 00
Shutter Speed Value: 4.32
Aperture Value: 8.64
Max Aperture Value: 4
Focal Plane X Resolution: 3810.58
Focal Plane Y Resolution: 3815.90
Focal Plane Resolution Unit: 2
Custom Rendered: Normal process
Scene Capture Type: Standard
X Resolution: 240
Y Resolution: 240
Resolution Unit: 2
Date Time: 2014:10:13 11:36:16
Software: Adobe Photoshop Lightroom 5.6 (Macintosh)
The CPL is a really great filter and you’ve done well here to try it out. I would like you to take note of a few things though. For one all filters reduce the amount of light that hits your sensor by at least some amount. Some CPL filters can take a stop off the amount of light that you passed through your lens. So often when using a filter like this you’ll need to pay extra careful attention to your exposure. In this case it looks a little underexposed and the CPL could be the culprit but it’s hard to tell.
Another thing to note about CPL filters is that you can rotate them. Ideally you can look through your viewfinder and rotate the CPL on the front of your lens while you look through. Then once you’ve found the desired effect you can shoot your image.
A downside of this is that sometimes the rotation is in the wrong place. This can create dark patches in the sky. I think that’s what happened here with the top right of the frame. Notice how dark and almost black the sky is in that portion of the frame?
CPL filters almost always work best when shooting perpendicular to the sun. A quick way of thinking about it is that if the sun/light source is off either of your shoulders it will work best.
I would recommend you play around with this filter even more. Shoot the same scene with it on, with it off, and a few different rotation positions. Then take note of the differences when you look at your images.
It’s a great filter and a key filter for landscape photography.
Nice work here, keep experimenting and playing around with your filters.