Depth of Field (DOF) demo

Discussion in 'Photography Beginners' Forum' started by Ron Evers, Aug 28, 2010.

  1. Ron Evers

    Ron Evers Been spending a lot of time on here!

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    I thought this might be helpful for the new-to-photography folks.

    I am presenting the same shot @ three different apertures to show how that relates to the DOF.


    1. f2.0

    [​IMG]


    2. f4.5

    [​IMG]


    3. f11

    [​IMG]


    You can see that as we use a higher f# we get less separation of the subject from the background. In this case @ f11 the dragonfly blends into the background but@ f2 it is separated from it.

    Taken with a Helios 58mm f2 manual lens on a Panasonic G1 mounted on a tripod. Pics are not cropped.
     
  2. crimbfighter

    crimbfighter No longer a newbie, moving up!

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    I noticed the color and sharpness in the third one are much better on the dragonfly. Is that mainly a function of the smaller aperture? Or were there any other factors that changed from picture to picture? I keep hearing the smaller apertures tend to be bet the sharpest on any lens.
     
  3. echoyjeff222

    echoyjeff222 No longer a newbie, moving up!

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    great post for all the beginners learning aperture :)
     
  4. BuS_RiDeR

    BuS_RiDeR No longer a newbie, moving up!

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    Good post...

    What lens did you use?

    My Canon 17-85 IS USM does not offer this DoF quality... Goes to show the importance of investing in good glass... Ah someday...
     
  5. Ron Evers

    Ron Evers Been spending a lot of time on here!

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    The only thing I changed between shots was the aperture of the lens. However the camera automatically changed the shutter speed.

    Yes, in general the smaller the aperture (larger f#) the sharper the image.
     
  6. Negative ISO

    Negative ISO TPF Noob!

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    Thanks for posting this, it is a nice example. The white balance appears to have changed between shots, and this confuses me. Is this a normal side effect of changing F-stop?

    Out of curiosity I dropped these JPGs into GIMP and tweaked the RED/GREEN levels of images 1 and 3 to match the white balance with the middle shot. In my results 1 & 2 look very similar, with subtle DOF changes. Image 3 still stands out with it's very different DOF.

    Thoughts?
     
  7. SageMark

    SageMark TPF Noob!

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    Great post.
     
  8. LuckySe7en

    LuckySe7en TPF Noob!

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    thanks a lot for this. although my kit lense only drops to f4, I can still get a little blur.
     
  9. Ron Evers

    Ron Evers Been spending a lot of time on here!

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    I noticed that too. The camera was on auto WB. I concluded, maybe wrongfully, that as the background had more influence it shifted the WB.
     
  10. kundalini

    kundalini Been spending a lot of time on here!

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    Nice examples Ron, but I would think that turning anything Auto to the OFF position would be the best for consistant and definitive results.

    Just my 2ยข.
     
  11. Ron Evers

    Ron Evers Been spending a lot of time on here!

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    If you read the footnote in the original post you would know the answer Mark. ;)

    This Russian lens is very nice glass & I got it shipped all in for under $30. A lot of old 35mm film camera lenses are excellent & can be bought cheap on eBay particularly the ones made in the former Soviet Union. I have another 55mm 49mm Leica mount coming from Moscow that is highly prized & is reportedly sharper & more contrasty than the one used here. Supposed to be very sharp wide open @ f2.8, a little slower than the Helios 58/2.0. Should get it next week. :D
     
  12. eccs19

    eccs19 TPF Noob!

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    Shame I can't try it out on my camera when it shows up. I'd keep it for a few days before delivering it to you. :lol:
     

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