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01/18/2003 06:54:11 PM · #1 |
| I'm kind of new to all this. I like DOF in some photos, others I'd like to widen it a bit more, especially in macro. I just don't know how. I keep reading it's all apature (increasing or decreasing). So basicly how does one widen his/her depth of feild? |
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01/18/2003 06:57:39 PM · #2 |
The higher the F number, the wider the depth of field.
F2.8 is very shallow, and F11 creates a very wide one. F22-F64 even more.
This is most often done in aperture priority or manual. Increasing the aperture setting also increases the need for shutter open time (doubles per stop - F2, F2.8, F4, F5.6, F8, F11), to get proper exposure.
For example F2 at 1 second is the same exposure as F2.8 at 2 seconds, is the same as F4 at three seconds, is the same as F5.6 at six seconds.....
Each stop higher F increases the depth of field / depth of focus, but also increases the need for camera stabilization. In these creative decisions aperture is about depth, shutter and iso about the amount of light comming in.
Message edited by author 2003-01-18 19:06:04.
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01/18/2003 06:58:15 PM · #3 |
You can change the DOF by changing the F stop/aperture. On your camera it may be F2 F3 F4 etc.
A low number has a small amount in focus.
A high number has more in focus.
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01/18/2003 07:06:08 PM · #4 |
| Thanks very helpful. I'll try this out. |
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01/18/2003 07:32:36 PM · #5 |
Anyone out there correct me if I'm wrong, but I've set my aperature on my digital camera to both extremes without noticing much of a change in depth of field. Something to do with the small area of the CCD sensor on most prosumer digital cameras,perhaps?
In any case, Fibre Optix may find that changing the aperature on the coolpix 995 won't make much of a difference.
Is this generally the case, or is there something unique about my camera? :)
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01/18/2003 08:34:29 PM · #6 |
check out this Tutorial I made
Depth of Field for Digital Cameras
Hope it's helpful :)
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01/18/2003 08:45:41 PM · #7 |
Thanks Mag .. I always wondered Why it's so har dto get a shallow DOF with a Digital cam .. now ..
I know why I want a digital SLR
Lionel |
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01/19/2003 07:39:23 AM · #8 |
Kollin, Great job with the Tutorial of depth of field (DOF), I enjoyed it and especially liked the image examples. Thank you for the contribution.
One question though. I have never heard of DOF described as a fraction before. I understood it to be a mathematical "factor" as in a "ratio" calculation. Maybe that is the same thing, is it?
For example, I always thought that f2.0 defined the ratio between the widths measured at the aperture opening compared to the depth measured from the rear element of the lens to the film plane (or in our case, the CCD faceplate plane). The depth part was the "1" and the width part was the "2". Yes, I can see how that can be described as a fraction (half as wide), but somehow it just does not strike me right to describe it that way. I thought that a ratio had a different meaning.
Can you clarify this point for me?
Also, I find it somewhat confusing with the various exchanges in terminology to describe the measure of DOF. I have always understood DOF described as either deep or shallow. Is it not normally viewed from the perspective of the photographer? Sure, wide and narrow work too, but then they would be from a perspective on an angle 90 degrees away or perpendicular to the photographer.
I know, it is all “mice nuts” (very small, minutiae kind of details), but I like details! Cheers, Michael |
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01/19/2003 09:28:10 AM · #9 |
There are three important things that might be added.
1)The relation between subject distance and DOF. The closer you are too the subject, the shallower the DOF for the same aperture setting. Don't change a thing (except new focussing) and stand back, will result in a wider dof at the same aperture.
2) Focal length and dof. The shorther the focal length at the same aperture, the more dof. That's why the advice for Macro's is not to zoom in, but get closer with you wideangle.
3)How the dof edges are situated in relation to the focus point: 1/3th will be in front of the focus point and 2/3th beyond. Something to keep in mind when you have problems with a blurred foreground and to much depth in the background -> focus in front of the subject.
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01/19/2003 11:59:33 AM · #10 |
Originally posted by Azrifel:
There are three important things that might be added.
1)The relation between subject distance and DOF. The closer you are too the subject, the shallower the DOF for the same aperture setting. Don't change a thing (except new focussing) and stand back, will result in a wider dof at the same aperture.
2) Focal length and dof. The shorther the focal length at the same aperture, the more dof. That's why the advice for Macro's is not to zoom in, but get closer with you wideangle.
3)How the dof edges are situated in relation to the focus point: 1/3th will be in front of the focus point and 2/3th beyond. Something to keep in mind when you have problems with a blurred foreground and to much depth in the background -> focus in front of the subject. |
Good information Sander... Thanks
Bob
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