Talk to me about this bokeh...

Discussion in 'Beyond the Basics' started by CThomas817, Sep 27, 2018.

  1. CThomas817

    CThomas817 TPF Noob!

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    Having zero information on the lens, distance to the subject, etc... do you think bokeh in the attached photos is real? Or enhanced in post? (These are not mine, found them on Google).

    Edited: Please do not post images that are not yours or for which you do not have permission. You may post a link.

    Even shooting wide open (f/1.8) with my 85mm (Nikon) and my background plenty far away from my subject, my bokeh is not even close to this creamy. Would a 135 f/1.4 or a 200 f/2 produce these results? I am trying to eliminate my time in post and get closer results SOOC.


     
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  2. RyanLilly

    RyanLilly No longer a newbie, moving up!

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    The size of the bokeh is all wrong in these. The flowers in the background, for example, would be very oof but they would also be much larger if it were just the effect of the lens. The first one is not at all the same lighting from the subject to the background, the foreground flowers look like some kid vomited cotton candy onto the bottom of the frame. I don't think that is just the lens doing that.
     
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  3. markjwyatt

    markjwyatt No longer a newbie, moving up!

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    I see a lot of photographers using full frame digital with very long lenses from a distance to shoot portraits. I wonder if that could do this. Also medium or large format might give this effect (but these look digital).

    [​IMG]
    pspsp'd
    by Mark Wyatt, on Flickr
     
  4. zulu42

    zulu42 Been spending a lot of time on here!

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    First one looks to me like a studio shot with a "OOF" backdrop, and maybe the third as well. The BG in the second at least looks like bokeh. I don't know, seems attainable...

    Don't know what body you use but the 85mm 1.8 ought to blow out the background nicely with adequate subject to background separation and, just as important, getting the camera as close to the subject as possible.
     
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  5. markjwyatt

    markjwyatt No longer a newbie, moving up!

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    Agree, the middle one looks the most plausible.
     
  6. Derrel

    Derrel Mr. Rain Cloud

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    200mm f/2 and 105mm f/1.4 lenses can produce this type of bokeh. The 200mm f/2 lenses (Canon and Nikon) give this type of look pretty easily. As you mentioned, the 135mm f/2 is another lens that can produce some of this type of dreamy background out of focus rendering. Similarly, a 300/2.8 can also do this type of stuff.

    85mm is too short to magnify the background as much as does the 200/2. The last shot, the Lisa Holloway shot...she's famous for using the 200mm f/2 lens for this type of background rendering.
     
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  7. CThomas817

    CThomas817 TPF Noob!

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    Hi - I'm on a D800. Close range to my subject (ie. Head and shoulders) the bokeh is what I want, its full body shots that leaves something to be desired. I was thinking about investing in a 135mm or 200mm prime.

    Thanks for your insight!
     
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  8. CThomas817

    CThomas817 TPF Noob!

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    Thanks so much, I figured these (or at least some) were longer lenses whether or not enhancements were done in post. Now I just have to sell a kidney.
     
  9. Designer

    Designer Been spending a lot of time on here!

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    Make sure you're figuring ALL the parameters correctly. This is all a proportional relationship, so the BG will have to be somewhat farther behind your subject in order to maximize the blur.

    If you use a DOF calculator (and you should) plug in all the variables to see how the blur will change when you change/adjust only one of the variables. By doing this consistently, you will get a feel for the various ranges even before you open the DOF calculator.

    My guess is that you're not allowing enough space behind your subjects when you want a full-body portrait.
     
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  10. Derrel

    Derrel Mr. Rain Cloud

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    And that is the problem, when you have to back up far enough to get a full body shot on the full frame camera you have a lot more depth of field and that is why the 85 mm does not blow out the background nearly as much when using a longer lens--which has a physically wider aperture at each F value. Physical aperture width, not the F value per se,is what determines background blur. Background blur and depth of field are two subtly different things. If you want more background blur,you need to go to a longer lens,which has a physically wider opening at each F value. This is why the 200mm f/2 lens is so good at totally blurring out backgrounds. just as a difraction is affected by true aperture width, and not F value, so is background blur!
     
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  11. CThomas817

    CThomas817 TPF Noob!

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    Thank you!
     
  12. zulu42

    zulu42 Been spending a lot of time on here!

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    Interesting because I was wondering about the longer focal lengths and how it would require increased camera to subject distance - thereby increasing DOF. But, if I understand correctly, the larger physical aperture size will more than make up for the increased distance to subject - as far as DOF is concerned. edit- as far as background blur is concerned
     
    Last edited: Sep 29, 2018
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