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What is DOF? — Depth of Field Revealed

June 28, 2010 by Marcel

This post may contain affiliate links. Read my disclosure policy here.

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Depth of field (DOF) is perhaps the most mysterious of camera basics. A simple definition for DOF would be what’s in focus or sharp in the scene and what isn’t.

Wikipedia further defines DOF as “determined by the camera-to-subject distance, the lens focal length, the lens f-number, and the format size or circle of confusion criterion”. Please totally and completely forget format size and circle of confusion for now, because unless you really have the first three down, the last two are just what you think they might be, a circle of confusion. This is the part that really confuses people. DOF is not just the aperature on your camera, but for now let’s focus on aperature.

The first thing we want to review is how f-numbers or aperature affect your depth of field. Aperature does not equal Depth of Field (I wish I had known that early on!) A small f-number, 2.8, will give you a very shallow focus as seen below.

 DOF_MG_0503

A bigger f-number, will give you a deep field of focus as seen below, which means more of the image will be sharp.

 DOF_MG_0507

Almost all cameras give a measure of control over your depth of field. The f-number can be controlled in a variety of ways depending on the model and make of your camera. Remember the word, “MANUAL”, use it. If you have an instant camera, review your settings. If your manual doesn’t explain it, just use common sense and a little experimentation to figure it out. You may have a macro mode (usually a setting represented by a tulip) and a landscape mode (usually represented by a mountain).

So lesson number one. If you just want a little bit of the scene to be in focus, use a small f-stop (tulip). If you want most of your scene to be in focus, use a big f-number (the mountain).

That’s part one….the next two parts are pretty critical as well. Your DOF will depend on how close you are to a subject AND the lens focal length (those little numbers you have on a big lens when you look down). A 2.8 with a 17mm lens is NOT the same thing as 2.8 with a 100mm lens, pinkie promise. I will save that for another day.

The best way to get consistent results is to experiment, practice, and compare results. You can also purchase a DOF guide for your camera at B&H Photo or here’s one you can download online.

Good Luck!

Written by 5 Minutes for Mom contributing editor, Marcel Walker.

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10 Comments

  1. دردشة عراقية says

    March 23, 2012 at 1:00 pm

    thankes for you

    Reply
  2. Marcel says

    July 8, 2010 at 4:26 am

    hhhh is right! And guess what, that’s only part 1. Wait till you see part 2. DOF is confusing for a reason:)

    Reply
  3. Ann Marie says

    July 7, 2010 at 1:12 am

    This is a GREAT explanation! I especially like the explanation of tulip/landscape modes for point and shoot cameras! Love the pictures too!

    Reply
    • Marcel says

      July 8, 2010 at 4:24 am

      Thank you for the kind words! I’m so glad this was helpful:)

      Reply
  4. Anne says

    June 29, 2010 at 5:30 pm

    Great post – DOF is such a tricky subject. The smaller the number, the wider the opening of the aperature?! It must have been counter-intuitive day when they came up with that one…

    Cheers,
    Anne

    Reply
    • Marcel says

      July 8, 2010 at 4:22 am

      Tell me about it, must have been done by a man. I’m going to search around and see if I can find out a little bit how that came about:)

      Reply
  5. Jaclyn Rubly says

    June 29, 2010 at 2:09 am

    Neat advice. I’m a beginning/intermediate photographer. I love your photography lessons and tutorials. Helps other moms that need a little help with their camera.

    Reply
    • Marcel says

      July 8, 2010 at 4:13 am

      And don’t we all need a little help? LOL! I am always amazed at what I need to learn. That’s partly what I love about photography ♥.

      Reply

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