Focus and Depth of Field

Outlined in this informative video are 4 different techniques for accurate focus as well as a discussion on DOF (depth of field) as it relates to each method. Additional information is provided on off-center focus using a rangefinder camera such as a Leica M. Video length: 12 minutes 11 seconds.

LINKS Discussed in the video:

CORRECTION!…. on the section related to Hyperfocal Distance the quick example is not accurate for the 90mm lens I was using as an example. In fact, the actual hyperfocal distance for that lens is 40′ and not 20′ as mentioned and as such in the example I gave it would have a depth of field from around 20′ to infinity and not 10′ to infinity.

One final note: You will notice that I have not posted any sample images featuring the above described techniques- this is on purpose… go out and shoot a roll of test film! Determine what is your best working solution based on your sharpness needs and shooting style.

9 Responses

  1. Jack

    I do not understand the infinity focus technique, although I read it several times.

    There is no real life example in that text, only scientific approach IMHO.

    Could you give an example of using this method( steps I need to take before shot) when making a portrait or a landscape.

    Please!!!

  2. […] Outlined in this informative video are 4 different techniques for accurate focus as well as a discussion on DOF (depth of field) as it relates to each method. Additional information is provided on off-center focus using a rangefinder camera such as a Leica M. Video length: 12 minutes 11 seconds. Focus and Depth of Field The Figital Revolution […]

  3. […] Zitat von SJP + 1 The original concepts are fine & there is no need to completely rethink the basics. As mentioned before a 0.001 mm circle of confusion is outside the realm of physics even in outer space, unless you have x-ray eyes you are right. i just wanted to exaggerate my point and just chose the smallest CoC available on the calculator. but, as most of my photographs are in the infinity-area (land- and cityscapes) i tested many focussing-concepts and only the infinity-concept gave me the results i wanted (and a lot of users around the web are reporting the same). there is also a nice video about different focussing-techniques (especially on a rangefinder): Focus and Depth of Field The Figital Revolution […]

  4. Stephen-

    Great video.

    However, don’t forget about the “circle of confusion”. Different formats have different “COC”. This can help one be more accurate in terms of “acceptablly sharp” within the “DOF”.

    Best,

    DM Brown

  5. I was hoping to see a demonstration of how to deal with shallow DOF when focusing with a RF but the video was a non-stop talkie with hardly any useful visual information apart from the time you pointed at the DOF markings on the lens. The “studio” setting didn’t help me to get in the mood of listening either. Just thought of giving some honest feedback regarding the effort because I appreciate your motives.

    Best,
    GTW

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