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06/19/2002 11:53:33 PM · #1 |
| Great DOF, very narrow at such small aperture f3.5. I am wondering though, why even at f1.8, it is very difficult for me to get a narrow DOF with my Oly 3040. |
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06/19/2002 11:55:41 PM · #2 |
Originally posted by CEO:
Great DOF, very narrow at such small aperture f3.5. I am wondering though, why even at f1.8, it is very difficult for me to get a narrow DOF with my Oly 3040.
I'm not sure, but depth of field is relevant to the distance to your subject... F1.8 is a much wider focal plane when your subject is 15 feet away than it would be if your subject is 6 inches away...
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06/20/2002 12:17:18 AM · #3 |
A lot of these digital cameras (and point-and-shoot film cameras too for that matter) have the shutter and the apature working together as one part, so the f-stop doesn't function quite like a 'normal' lens. It all depends on the camera and the exact design. With some cameras you don't get any DOF control, and with others you almost get what a normal lens would give. Also, that's why you don't have a full selection of shutter speeds at wide open apatures. The circular shutter is built into the apature diaphram and it can't move that fast. For example my G2 is limited to 1/640 sec. until the lens is stopped down to f 5.6, then the speed increases on a sliding scale, reaching 1/1000 at f 8.
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06/20/2002 03:45:08 AM · #4 |
Originally posted by CEO:
Great DOF, very narrow at such small aperture f3.5. I am wondering though, why even at f1.8, it is very difficult for me to get a narrow DOF with my Oly 3040.
You might also want to take a look at
this thread.
A couple of people rightly point to the excellent tutorialon DOF and digital cameras. |
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