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DOF (Depth of Field)

Discussion in 'Open Discussion' started by Bullfrog, Jan 19, 2010.

  1. Bullfrog

    Bullfrog Mu-43 Top Veteran

    • Like Like x 3
  2. BBW

    BBW Super Moderator Emeritus

    Thanks Bullfrog. Initially I thought "circle of confusion" was a witty euphemism.:blush: Then I searched it and found this link which helped me understand better what it really means: http://www.cambridgeincolour.com/tutorials/depth-of-field.htm The pictures make it all much easier for me to get it. It's also a rather handy way to see and understand depth of field. Especially for folks who are visual, as opposed to mathematical.:wink:
     
    • Like Like x 1
  3. chalkdust

    chalkdust Mu-43 Regular

    97
    Dec 29, 2009
    McKinney, Texas
    This was a great place to try some "what if" cases. I have thought for some time that sensor size fits into the DOF equation due to differing amounts of enlargement necessary. So I used full frame (Leica M9 - which I DO NOT own but would gladly accept), 50mm f2 10ft focus as my comparison - a total depth of field of 1.45 ft.

    When I tried the G1 with 25mm (to get comparable field of view) f2 10 ft, it showed 2.96 ft total DOF. The G1 with 50mm f2 at 10 ft had a narrower DOF than the M9 with the same lens, only 0.72 ft. This must be due to the need to enlarge a G1 image more than a M9 image. Interesting to me was that the G1 with a 35mm f2 lens had about the same DOF as a M9 with a 50mm f2 lens.

    This helps me pre-think lens choices a little bit. Very nice information, Bullfrog.
     
  4. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    A couple of extreme practical examples

    nothing special - but shows you the DOF effect at different f stops

    D300 with old NAI Nikkor 55mm f1.2 ISO 1000 indoors

    @ 1 foot at f1.2 there is no DOF
    @ 2 foot at f16 the DOF is 6 inches

    (I reckon that this lens will be impossible to focus on my G1 - I just wish the camera had a "focus confirm" for MF lens, (as Nikon DSLRs)

    [​IMG]

    and a quick shot in the kitchen

    [​IMG]
     
    • Like Like x 3
  5. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    By the way, to use the program, enter .015 as the coc for the m4/3 cameras.
    Shooter
     
  6. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    Shooter, can't you just choose a Micro 4/3 camera from the list instead?
     
  7. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    I think you may be pleasantly surprised, Bill. With static subjects, I find that the magnified view in my G1 gives me more accurate and precise manual focus than I got using the "focus confirm" arrows on a Nikon D700.
     
  8. BillN

    BillN Mu-43 All-Pro

    Jan 19, 2010
    SW France
    I know it is a bit off topic
    I use focus confirm thru the VF - then switch to Live View for the final tweek and then mirror up for the shot
     
  9. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    The version on my iPhone doesn't have the cameras listed...yet.
    Vivek & Jono Slack suggested the .015.
    It works....
     
  10. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    Ah, I didn't realize there was an iPhone version. Had only seen the web site.
     
  11. Streetshooter

    Streetshooter Administrator Emeritus

    Dec 15, 2009
    Phila, Pa USA
    Yessir! This here digital photo world is the s*it.
    It's a free download and is great to have in the iphoney.
    I reckon you'll be gettin it in a few minutes....
    Photoshop has a cool program for free also.
    Good stuff.....
    I want some brownie points for this....
     
    • Like Like x 2
  12. BBW

    BBW Super Moderator Emeritus

  13. John Jarosz

    John Jarosz Mu-43 Regular

    52
    Jul 29, 2010
    Chicago Area
    ipod touch version, thanks a bunch

    GREAT FOR VIEW CAMERA STUFF TOO.

    John
     
  14. dulaney22

    dulaney22 Mu-43 Regular

    106
    Aug 18, 2010
    Thank you for bumping this BBW. I've been trying to figure out how distance and aperture affected DOF by just testing settings. Bokah is a really cool sounding concept for a beginner like me, but when you don't really understand it (like me) you wind up trying to use to large an aperture and lose focus in the picture.

    Below is an example where I caught my girls acting silly. I had just gotten my Minolta 58mm 1.4 + adapter and took this at f2 at about 10', focusing on my oldest in the middle. When I got home and loaded the pics I noticed that, even though my younger girls were just a little in front of her, they were more out of focus. So . . . I spent a good deal of time later that night trying to test it with distance and settings. It was a frustrating process.

    Thank you for bumping and linking these sites. By using the calculator I now see that I only had half a foot or so of focal range.

    Here's the pic:

    P8301172.
     
    • Like Like x 1
  15. John Jarosz

    John Jarosz Mu-43 Regular

    52
    Jul 29, 2010
    Chicago Area
    Just FYI, the Wikipedia article on Circle of Confusion lists the CoC for the 4/3rds format as .015mm. And the DOFmaster app is quite cool.

    John
     
    • Like Like x 1
  16. kiynook

    kiynook Mu-43 Regular

    70
    Aug 16, 2010
    Just in case anyone is interested....I have installed the program on my Windows mobile phone and have been using it to check with no problems...
     
  17. dko22

    dko22 Mu-43 Regular

    163
    Jul 26, 2010
    Stuttgart, Germany
    am inclined to agree from tests so far
     
  18. kend

    kend New to Mu-43

    6
    Apr 9, 2010
    Could you tell me which one you are using on your windows phone
    Thanks