Noise with a plolarizer?

Discussion in 'Beyond the Basics' started by nakedyak, Jan 8, 2007.

  1. nakedyak

    nakedyak TPF Noob!

    Joined:
    Sep 6, 2005
    Messages:
    451
    Likes Received:
    1
    Location:
    Columbus, OH
    Can others edit my Photos:
    Photos NOT OK to edit
    Ive noticed that when using my polarizing filter, there seems to be a lot of noise in the darker areas. Here are some examples

    20D, 17-40, F8, iso 100...so there shouldnt be any noise. this sample was a jpg, but i also shot it in raw, and the noise was still there. thanks

    [​IMG]

    here's a closeup of what im talking about

    [​IMG]
     
  2. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

    Joined:
    Dec 16, 2003
    Messages:
    33,821
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    Doesn't look very noisy at all, to me. You can see a bit of something...but it's not anything I wouldn't expect from any digital camera.

    Also, noise seems to come out in dark/under exposed areas (which this is)...and noise seems to be more noticeable in solid color areas (which this is)...I think Red is the worst but blue isn't the best color to hide the noise.
     
  3. Alex_B

    Alex_B No longer a newbie, moving up!

    Joined:
    Aug 30, 2006
    Messages:
    14,491
    Likes Received:
    206
    Location:
    Europe 67.51°N
    Can others edit my Photos:
    Photos NOT OK to edit
    it is an ultrawide angle so you underexposed some part of the sky considerably due to the polariser. i remember we discussed this a bit very recently somewhere on the forum *tries to remember*

    anyway, underexposed areas of an image are always more prone to noise, even if you don't pull them brighter. it is not really bad for a digital camera.
    was it a hot day? that might be able to raise nose levels as well a bit if the senor got really hot.
     
  4. nakedyak

    nakedyak TPF Noob!

    Joined:
    Sep 6, 2005
    Messages:
    451
    Likes Received:
    1
    Location:
    Columbus, OH
    Can others edit my Photos:
    Photos NOT OK to edit
    I don't think that area is necessarily underexposed, just darker due to the polarizer. Not a hot day, maybe 50s.

    Just seems to be a little bit of more noise than I'd like...just wondering if its normal.

    I was also using a UV filter with this shot
     
  5. Alex_B

    Alex_B No longer a newbie, moving up!

    Joined:
    Aug 30, 2006
    Messages:
    14,491
    Likes Received:
    206
    Location:
    Europe 67.51°N
    Can others edit my Photos:
    Photos NOT OK to edit
    the filter should not make a difference.

    ok, so that was not a hot day.

    sharpening pronounces noise as well, but those don't seem to be oversharpened in camera. hmmm, not sure how much noise is normal on a 20D.
     
  6. Don Simon

    Don Simon TPF Noob!

    Joined:
    Jul 4, 2005
    Messages:
    2,484
    Likes Received:
    0
    A UV filter and a polarising filter? I don't know if that would increase noise specifically but it certainly won't do you any favours. It's best not to stack filters unless it's necessary... and in this case it isn't, just stick with the polariser.
     
  7. nakedyak

    nakedyak TPF Noob!

    Joined:
    Sep 6, 2005
    Messages:
    451
    Likes Received:
    1
    Location:
    Columbus, OH
    Can others edit my Photos:
    Photos NOT OK to edit
    sharpening is set at 0...

    i did just increase in camera saturation however, kind of ala Ken Rockwell...

    I was under the impression that the 20d handled noise expertly. It's been my experience that it does anyway
     
  8. Alex_B

    Alex_B No longer a newbie, moving up!

    Joined:
    Aug 30, 2006
    Messages:
    14,491
    Likes Received:
    206
    Location:
    Europe 67.51°N
    Can others edit my Photos:
    Photos NOT OK to edit
    ahhh.. that might be part of the clue then! that can increase noise!

    maybe try setting that back to normal, do some noise reduction on your raw image and then increase saturation .. just an idea




    infamous ken rockwell again ...:meh:
     
  9. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

    Joined:
    Dec 16, 2003
    Messages:
    33,821
    Likes Received:
    1,811
    Location:
    Edmonton
    Can others edit my Photos:
    Photos NOT OK to edit
    Yes, increasing the saturation can add a bit of noise.

    That doesn't matter to the camera...the area in question is dark...which can tend to show the noise.

    Again, I don't think it's very bad at all...and maybe you are expecting too much, or being too picky. Viewing a shot at 100% on the screen is almost the same as making a large print and viewing it with your nose up to the paper. Of course you are going to see some imperfections...if it was shot on 35mm film...you would probably see the film grain.

    If it does bother you, you can always increase the noise suppression or run it though a noise program like Neat Image.
     
  10. Alex_B

    Alex_B No longer a newbie, moving up!

    Joined:
    Aug 30, 2006
    Messages:
    14,491
    Likes Received:
    206
    Location:
    Europe 67.51°N
    Can others edit my Photos:
    Photos NOT OK to edit
    yes, een if i shoot on fine grain velvia, the grain would be at least what we see here... and then i use neatimage to get rid of it if it bothers me.
     
  11. nakedyak

    nakedyak TPF Noob!

    Joined:
    Sep 6, 2005
    Messages:
    451
    Likes Received:
    1
    Location:
    Columbus, OH
    Can others edit my Photos:
    Photos NOT OK to edit
    i will try a few things tomorrow like over exposing a little bit, reducing saturation in camera,, taking the uv filter off, etc
     

Share This Page