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  1. #1
    Join Date
    Aug 2005
    Posts
    6,931

    Experiments in filtration

    Here is the story.

    D300, 50mm f1.8 lens, f8. Camera on tripod. Sun high overhead above my right shoulder and slightly behind the camera.
    Shot in RAW imported into LR3.3, camera landscape and lens correction setting applied (sync'd to all photos). No other pp.

    No filter 1/800 sec


    CP Filter 1/125 sec


    ND2 Filter 1/400 sec


    ND4 Filter 1/250 sec


    ND6 Filter (2+4) 1/100 sec


    ND8 Filter 1/100 sec


    ND10 Filter (2+8) 1/40 sec


    ND12 Filter (4+8) 1/25 sec


    ND14 Filter (2+4+8) 1/13 sec


    Edited to add shutter speeds.
    Last edited by K1W1; 12-24-2010 at 04:28 AM.

  2. #2
    Join Date
    Nov 2005
    Location
    Canada
    Posts
    667
    Does a circular polarizer alter the white balance? I see a bit more of a yellow tint to the trees in the circular polarizer picture.

    The only other thing I can think of is that the sun in that picture went behind a small cloud.
    Nikon D40|Nikon D5100|AF-S 50mm f/1.4|AF-S 18-105mm DX|SB 900|SB 400|AF-S 35mm f/1.8 DX|AF-S 10-24mm DX

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  3. #3
    Join Date
    Aug 2005
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    6,931
    It may be the angle of the sun it wasn't really ideal for either the shots overall or the CP Filter. The main thing I was interested in was the effects of the various filters on the surface of the water.

  4. #4
    Join Date
    Dec 2005
    Location
    Maryland's Eastern Shore
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    2,143
    Great comparison, always wanted to see real world differences.
    I see alot of Lukas's photos with various filters but would not know
    where to begin on which to use. The softening of the water really
    changes the image. What were the ss on first and last?
    - Rich

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  5. #5
    Join Date
    Aug 2005
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    6,931
    Quote Originally Posted by rawpaw18 View Post
    What were the ss on first and last?
    I have added them.

  6. #6
    Join Date
    Aug 2007
    Location
    Brisbane, CA
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    3,591
    Rawpaw, I don't really used solid NDs yet, but I am looking to add something to my filter collection. Has anyone tried to make a variable ND filter with linear and circular polarizer? I think they might be called faders as well. I'm curious how well they work.
    Lukas

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    I could tell you but I wouldn't want you to get all pissy if it's the wrong brand

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  7. #7
    Join Date
    Oct 2006
    Location
    San Francisco
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    2,251
    Quote Originally Posted by TheWengler View Post
    Has anyone tried to make a variable ND filter with linear and circular polarizer? I think they might be called faders as well. I'm curious how well they work.
    That sounds interesting. I'm curious too.
    Adam
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  8. #8
    Join Date
    Jan 2008
    Location
    Terra Australis Incognita
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    3,877
    I read something negative about them on the net Lukas but no personal experience.

    I'm guessing auto white balance which affected the colour due to more sand in the shot as the CP is blocking blue in the foreground by allowing you to see through the reflection to the sand.
    D800, D300, D90, 24-70 f2.8, 70-200VR f2.8, 300 F4, 105 micro, 16-85VR, 50mm 1.8, Tammy 90 macro, 70-300VR, SB900, 2xSB600, MB-D10, 055XPROB 322RC2. New computers to run photoshop faster. C&C always appreciated. PhotoGallery
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  9. #9
    Join Date
    Aug 2007
    Location
    Brisbane, CA
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    3,591
    Yeah I did a bit of research on them yesterday. Sounds like they have issues when they're dialed up to block more light at a wide angle. I think I'll look for a couple 4x4" filters that will fit into my filter holder.
    Lukas

    Camera: Anonymous
    I could tell you but I wouldn't want you to get all pissy if it's the wrong brand

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  10. #10
    Join Date
    Sep 2007
    Location
    Kanagawa, Japan
    Posts
    267
    The CP pic is interesting. Not only are some reflected light waves blocked, but looks to me that most of those blocked are on the blue or high end of the visible light spectrum. I didn't know that CPs were selective in terms of the wavelengths (= color) of light blocked. Or maybe it's just that a lot of the light coming in at that angle happens to be quite blue, given that the sky is quite blue. (The shutter speed is also slower - perhaps giving the lower energy wavelengths on the red and orange end more time to reach the sensor?)

    The reason I mention this is that when you take underwater photos, you lose reds, yellows first with depth - those lower energy colors are filtered out first. Using a strobe (or some creative post processing) can bring back those colors to your shot. Your CP shot looks like one of my post processing tricks for those.
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