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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    Right... your lens just has to have it!


     
  2. CThomas817

    CThomas817 TPF Noob!

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    Thank you for understanding my question!!
     
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  3. JBPhotog

    JBPhotog No longer a newbie, moving up!

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    At 15 feet an 85mm at f2 has enough DOF to capture all you need to get a face in focus and then some. The field of view will of course be different than a 200 at 30 feet.

    Remember, DOF is calculated as the zone of acceptable sharpness based on the circle of confusion for your sensor.

    FYI:
    DC220EFE-C240-411B-B34F-EA7C27EFE34E.jpeg 3CC2B002-E884-49B5-B29C-2759E006E5E6.jpeg 2FCDA899-914F-48F6-8344-5881F64C3097.jpeg
     
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  4. Designer

    Designer Been spending a lot of time on here!

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    Here is a screen shot when I plugged in the values you gave me. As you see, the total DOF is only .54 feet, so your subject's thickness should be only about 6 inches. (joke) Obviously nobody is that thin, so you'll get some blur at the back of her head.
     
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  5. Designer

    Designer Been spending a lot of time on here!

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    (attached)

    Screen Shot 2018-10-03 at 9.55.33 AM.png
     
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  6. Braineack

    Braineack Been spending a lot of time on here!

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    It's been a while, but I thought I had read it had better sharp to soft transition, a bit mushier blur, and a little sharper where in focus. But yeah, marginally at best probably not the best example to pick. But comparing the 50mm 1.8g and a 58mm 1.4g...
     
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  7. JBPhotog

    JBPhotog No longer a newbie, moving up!

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    These are for a DX sensor, the OP is using an FX sensor, different CoC calculation.
     
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  8. Designer

    Designer Been spending a lot of time on here!

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    Oh, right you are! My mistake. Anyway, she can run the calculation herself.
     
    Last edited: Oct 5, 2018
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  9. JBPhotog

    JBPhotog No longer a newbie, moving up!

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    I did that for him in post #39.
     
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  10. CThomas817

    CThomas817 TPF Noob!

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    Herself... and thanks so much! The DOF calc was what I needed!
     
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  11. JBPhotog

    JBPhotog No longer a newbie, moving up!

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    Oops! Sorry for the gender error. :)
     
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