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Thread started 07 Aug 2012 (Tuesday) 00:24
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CPL Question: Far Too Dark In The Outer Area Is 'Natural Look' Or Not?

 
x_tan
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Aug 07, 2012 00:24 |  #1

CPL Question: Far Too Dark In The Outer Area Is 'Natural Look' Or Not?

Hi All,

I notice some of my shoots with CPL, the outer area is much into deep dark blue; which I don't feel natural:

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The Eiger & Kleine Scheidegg, Swiss Alps (external link) by X_Tan (external link), on Flickr
(This shoot I add about 1 to 2 steps more to 'light up' it already)

Personally I rather have more even blue over the whole sky - so I should use Neutral Density or Graduated Neutral Density filter instead?

Many thanks

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Laramie
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Aug 07, 2012 00:29 |  #2

Looking at the shot as whole, and how the shadows are prominent vs. the small amount of direct sunlight, I don't think it's too uneven, but I see what you mean in looking at it.

Did you shoot any without the CPL? I wonder if you could have played with Saturation/Luminance in ACR and gotten a more even look?


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bpalermini
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Aug 07, 2012 00:45 as a reply to  @ Laramie's post |  #3

How wide a lens were you using. Polarizers and medium to super wide lenses don't work well together. I have this problem with a CPL on my 16-35 when it is wider than 22 or so.


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x_tan
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Aug 07, 2012 01:00 |  #4

Laramie wrote in post #14824282 (external link)
Looking at the shot as whole, and how the shadows are prominent vs. the small amount of direct sunlight, I don't think it's too uneven, but I see what you mean in looking at it.

Did you shoot any without the CPL? I wonder if you could have played with Saturation/Luminance in ACR and gotten a more even look?

bpalermini wrote in post #14824323 (external link)
How wide a lens were you using. Polarizers and medium to super wide lenses don't work well together. I have this problem with a CPL on my 16-35 when it is wider than 22 or so.

I used 24L on 550D / T2i for above one.

Then make sense 17-40L on 5D2 is even worse:

IMAGE: http://farm8.staticflickr.com/7026/6730583799_7b2e028b84_b.jpg
IMAGE LINK: http://www.flickr.com/​photos/x_tan/673058379​9/  (external link)
Jungfraujoch, Swiss Alps (external link) by X_Tan (external link), on Flickr

Canon 5D3 + Zoom (EF 17-40L, 24-105L & 28-300L, 100-400L II) & Prime (24L II, 85L II, 100L, 135L & 200 f/2.8L II; Zeiss 1,4/35)
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Whortleberry
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Aug 07, 2012 05:55 |  #5

x_tan wrote in post #14824269 (external link)
CPL Question: Far Too Dark In The Outer Area Is 'Natural Look' Or Not?
I notice some of my shoots with CPL, the outer area is much into deep dark blue; which I don't feel natural:

Personally I rather have more even blue over the whole sky - so I should use Neutral Density or Graduated Neutral Density filter instead?

  1. The effect you see is totally natural and reliant on the way in which polarisation works.
  2. In fact, the total opposite of your title statement is the truth. The 'too dark' appearance is a direct consequence of how you set the CPL. Adjust only the CPL rotation on the lens (ie less polarisation dialled in, same focal length set, same composition) and the effect will reduce.
  3. No, using an ND 'filter' will change the entire scene and you would still have the imbalance between sky brightness value and foreground brightness value. Effectively, you would simply reduce the overall exposure.
  4. Yes, a graduated ND would work - after a fashion. As always, you then have to struggle with the straight demarcation between the ND portion and the clear portion of your 'filter'. There's always something which pops up and disrupts the effect.
Polarisation effect is always most apparent cross sun - with the sun either totally on your right side or totally on your left. As you turn either towards or away from the sun (up-sun or down-sun) the light becomes less polarised.

If you were to take a 180° (horizontal) angle of view image with the camera pointing directly across the fall of sunlight, you would have a sky which was quite pale at each end of the image and quite dark in the centre. Swivel through 90° so the sun is in the centre of the image and you'd have a pale sky in the centre and dark at the edges of the image. Consequently, the wider the angle of view of the lens, the greater the difference visible across the sky. The same would also apply if the sun was just about to set and you pointed the camera straight upwards - darkest at the centre and palest left and right edges, but not at top and bottom edges.

Unfortunately, a polarising filter (linear or circular) is not a universal panacea. Very useful on occasion but with wide angle lenses you are virtually guaranteed to get the effect you show.

PS. This is all theoretical on my part. Living in the north of England, I have very little recent personal experience of sunshine. I vaguely remember it from 60 years ago when I was a little boy. :cry: - I think our Government have banned it now! :lol:

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Aug 07, 2012 06:02 as a reply to  @ Whortleberry's post |  #6

^ Great post.

I shouldn't turn my CPL to max sometime then!


Canon 5D3 + Zoom (EF 17-40L, 24-105L & 28-300L, 100-400L II) & Prime (24L II, 85L II, 100L, 135L & 200 f/2.8L II; Zeiss 1,4/35)
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Whortleberry
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Aug 07, 2012 07:22 |  #7

Whatever setting you find gives the result you want. No rules but sometimes "Less is More".
BTW, loved your image of Jungfraujoch and actually I rather liked the polarisation the way you have it.


Phil ǁ Kershaw Soho Reflex: 4¼" Ross Xpres, 6½" Aldis, Super XX/ABC Pyro in 24 DDS, HP3/Meritol Metol in RFH, Johnson 'Scales' brand flash powder. Kodak Duo Six-20/Verichrome Pan. Other odd bits over the decades, simply to get the job done - not merely to polish and brag about cos I'm too mean to buy the polish!
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neilgcart
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Aug 09, 2012 16:21 |  #8

x_tan wrote in post #14824351 (external link)
I used 24L on 550D / T2i for above one.

Then make sense 17-40L on 5D2 is even worse:
QUOTED IMAGE
IMAGE LINK: http://www.flickr.com/​photos/x_tan/673058379​9/  (external link)
Jungfraujoch, Swiss Alps (external link) by X_Tan (external link), on Flickr

Looks typical for a CPL on a reasonably wide lens.

Neil




  
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x_tan
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Aug 09, 2012 18:04 |  #9

Thanks Guys :)

I'll try CPL with the max and minimum with UWA lens and see what happen.


Canon 5D3 + Zoom (EF 17-40L, 24-105L & 28-300L, 100-400L II) & Prime (24L II, 85L II, 100L, 135L & 200 f/2.8L II; Zeiss 1,4/35)
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CPL Question: Far Too Dark In The Outer Area Is 'Natural Look' Or Not?
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