Distortion Issues

Discussion in 'Beyond the Basics' started by ORourkeK, Apr 12, 2019.

  1. ORourkeK

    ORourkeK No longer a newbie, moving up!

    Joined:
    Dec 30, 2013
    Messages:
    292
    Likes Received:
    96
    Location:
    Philadelphia, PA
    Can others edit my Photos:
    Photos OK to edit
    I LOVE my Nikkor 105mm 1.4. With that said, I am TERRIBLE at controlling the amount of lens distortion I am getting. I have read a ton of information but I do not retain the knowledge very well when it comes to this topic. Any suggestions? The first image is an example of the distortion I would like to avoid. The second two were shot with the same aperture (f/2.0) and shutter speed (1/500th).

    PS: My boys are IMPOSSIBLE to take pictures of. My 5 y/o told me "I don't know where the camera is" when I asked him repeatedly to look at the camera. ;(

    1.
    [​IMG]

    2.
    [​IMG]

    3.
    [​IMG]


     
  2. goooner

    goooner Been spending a lot of time on here!

    Joined:
    Oct 4, 2014
    Messages:
    2,323
    Likes Received:
    1,030
    Location:
    Germany
    Can others edit my Photos:
    Photos OK to edit
    What kind of distortion do you mean? Most software automatically correct lens distortion. These look good, with that 3d look you get with great subject seperation.
     
    • Agree Agree x 1
  3. dennybeall

    dennybeall No longer a newbie, moving up!

    Joined:
    May 13, 2014
    Messages:
    2,252
    Likes Received:
    414
    Location:
    Crystal River, Florida
    Can others edit my Photos:
    Photos OK to edit
    I like all three and frankly don't see any distortion. The depth of field is kind of shallow in the first one but that makes the shot great in my mind.
     
  4. ORourkeK

    ORourkeK No longer a newbie, moving up!

    Joined:
    Dec 30, 2013
    Messages:
    292
    Likes Received:
    96
    Location:
    Philadelphia, PA
    Can others edit my Photos:
    Photos OK to edit
    In the first one, I feel like the trees look like they are starting to spin. Particularly in the top left of the image.
     
  5. tirediron

    tirediron Watch the Birdy! Staff Member Supporting Member

    Joined:
    Jul 8, 2005
    Messages:
    43,509
    Likes Received:
    13,566
    Location:
    Victoria, BC
    Can others edit my Photos:
    Photos OK to edit
    What you are referring to is what's commonly called "Bokeh" a Japanese term which has come to mean the way in which a particular lens renders the unfocused portions of an image. This particular lens has less than ideal bokeh in my opinion. Unfortunately, there's little you can do; it's a factor almost exclusively determined by the physical design characteristics of the lens. You may be able to change it somewhat by varying the aperture or your lens to background distance, but that's about it.

    The size, shape and number of blades in the aperture, along with the focal length of the lens are the main components which determine the appearance of bokeh. Some lenses, such as the Nikkor 85mm 1.4 AF-D are noted for their wonderful bokeh rendering, often referred to as "creamy" for the way in which things seem to melt together. This lens has what I would call "nervous" or "jittery" bokeh. Sounds like you just found that excuse you were looking for to buy new glass!
     
  6. ORourkeK

    ORourkeK No longer a newbie, moving up!

    Joined:
    Dec 30, 2013
    Messages:
    292
    Likes Received:
    96
    Location:
    Philadelphia, PA
    Can others edit my Photos:
    Photos OK to edit
    I always see people talk about the different characteristics of a lens's bokeh but never really understood it. I love most of the shots I get with the 105mm, however, some are just absolutely ridiculous. I guess I just have to do a better job at adjusting the aperture. Is it the focal distance of the 105mm that does this? I remember shooting with a 70-200m and the amount of blur I could get at 200mm was absurd. But if that is the case, why are most of the images smooth and soft, while others look like I moved the picture before the paint dried? Is it the DOF? The further my subject is from the background the more likely this is to happen? Although, now that I write this, I remember I took pictures where the subject was a football field away from the background and this didn't happen... I assume the only thing I can do it check after the shot to make sure it is ok. The only issue here is that I have a hard time noticing this on camera. Especially when trying to chase these two around without missing an opportunity.
     
  7. Strodav

    Strodav TPF Supporters Supporting Member

    Joined:
    Nov 25, 2018
    Messages:
    114
    Likes Received:
    48
    Location:
    Houston, Tx
    Can others edit my Photos:
    Photos OK to edit
    I agree with the other comments on bokeh, DOF and perspective, but want to add your camera might be able to help a little. My cameras have a Pv button or Preview button. It closes down the aperture while you are looking through the viewfinder so you can see what's in focus and how the background looks. It is of limited use because what you see gets darker depending on how bright it is and your aperture setting. Another thing to look at is Live View, which allows you see what your adjustments look like before you take the shot.
     
  8. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

    Joined:
    Mar 8, 2011
    Messages:
    23,518
    Likes Received:
    8,416
    Location:
    Iowa
    Can others edit my Photos:
    Photos NOT OK to edit
    I'm lost. Are we discussing distortion, DOF or bokeh?
     
  9. Derrel

    Derrel Mr. Rain Cloud

    Joined:
    Jul 23, 2009
    Messages:
    42,851
    Likes Received:
    16,329
    Location:
    USA
    Can others edit my Photos:
    Photos OK to edit
    offer: I will PM you my shipping address and will PayPal you $50. You can send me that awful, distortion-prone 1051.4, and I will send you my 1983 105mm/2.5 Ai-S. Deal or no deal?
     
  10. 480sparky

    480sparky Chief Free Electron Relocator Supporting Member

    Joined:
    Mar 8, 2011
    Messages:
    23,518
    Likes Received:
    8,416
    Location:
    Iowa
    Can others edit my Photos:
    Photos NOT OK to edit
    Deal.

    In fact, I'll sweeten the deal for you. I will send you ALL my 105/1.4's for ALL of your 105/2.8's.
     
  11. Strodav

    Strodav TPF Supporters Supporting Member

    Joined:
    Nov 25, 2018
    Messages:
    114
    Likes Received:
    48
    Location:
    Houston, Tx
    Can others edit my Photos:
    Photos OK to edit
    I think we agreed what the op is seeing is not distortion, but bokeh. Bokeh is a characteristic of the lens. Lens designers are lauded for their lens ability to provide a pleasing bokeh, especially for portraits lenses. Bokeh is the effect seen when the lens "blurs" the background. If DOF is deep (small aperture, longer focal length or short distance from the background) the background may not be blurred or slightly blurred and bokeh will not be evident. If the DOF is shallow (wide open aperture, short focal length, camera close to subject, background a little further back) then the background will be blurred and bokeh may be evident. So, DOF, focal length, distance to subject and background, aperture, and the lens itself are all factors in bokeh. Distortion, which usually means geometric distortion is not.
     
    • Agree Agree x 1
  12. Derrel

    Derrel Mr. Rain Cloud

    Joined:
    Jul 23, 2009
    Messages:
    42,851
    Likes Received:
    16,329
    Location:
    USA
    Can others edit my Photos:
    Photos OK to edit


    Shallow depth of field, selective focus, and bokeh...three sides of a triangle...distortion usually refers to, as Strodav mentioned, geometric distortion of lines or shapes. An added category, background blur, could be added to the triangle above, creating a square, or four-part lenswork equation.
     

Share This Page