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10/04/2009 08:04:26 AM · #1 |
Someone insisted that I have my concepts of dof backwards
They were telling me that an Fstop of 2.8 will give me more dof than a an f-stop of 8
(I was shooting the subject 3-4 feet away fom the wall and I was 2-4 away from the subject)
I was confused and stated that the higher the fstop the more dof and the lower the fstop the less dof
the individual insisted that I have it backwards.
He swore I was wrong.
Could have the concepts of Dof wrong all this time?
Can someone confirm me either way?
Thanks
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10/04/2009 08:05:47 AM · #2 |
| Take the individual aside, slap them around, and give them a dunce cap. |
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10/04/2009 08:05:48 AM · #3 |
| You are correct, an f stop of 8 will give you much more DOF than 2.8. |
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10/04/2009 08:08:04 AM · #4 |
| You're right, he's wrong. Where people do sometimes get confused is in describing the aperture as narrow or wide - a narrow aperture (ie higher f-stop number) gives a deeper depth of field, an wide aperture (ie lower f-stop) gives a shallower dof. |
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10/04/2009 09:13:03 AM · #5 |
| Yeah, you better make sure to tell your friend that they can get gonorrhea from their car seat if not cleaned regularly! ;) |
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10/04/2009 10:38:40 AM · #6 |
Your buddy has it backward. I am waiting for someone to get to this thread and post all the mathematical formulae related to this effect.
Meanwhile, if you look on your older lenses that have an aperture ring, you will see that for each f stop marking, that there are two corresponding marks (usually colored to match the colors of the f numbers on the aperture ring) that align with the focus distance scale on the focus ring. Notice that the marks on the barrel get closer together with each f stop toward wide open. The marks were there to indicate the distances from the camera that subjects would be in "acceptable" focus at each aperture and range setting of the aperture and focus rings.
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10/04/2009 12:06:19 PM · #7 |
wow.
I would ask your friend to stand there with his/her camera, shoot the subject both ways and prove it to you. The person is so fundamentally and completely incorrect about this that one wonders if (a) s/he has ever really used a camera on anything but automatic, or (b) if somehow s/he was talking f28, not f2.8 :-)
Message edited by author 2009-10-04 12:06:40. |
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10/04/2009 01:10:55 PM · #8 |
| I think many people misunderstand the term "depth of field" as meaning a blurry background. Probably because they first hear the term in association with photos that have that quality. I've seen posts on Flickr asking how to get a "depth of field effect" with a compact. At first the response was that it is easier with the compact, until I realize what they are actually asking for. This is also how we got so many shallow DOF entries in the recent deep DOF challenge. |
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