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03/01/2004 10:31:06 PM · #1 |
Hello,
Am trying to focus on a subject wherein I want to focus the entire subject (a flower), rather than focussing just one part of the flower.
But in my case only one of the AF points gets illuminated and focuses ona particular point. How can I get the entire subject in focus
Ashish |
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03/01/2004 11:03:10 PM · #2 |
Set your camera on Av mode (aperture priority) and select the smallest aperture of the focal length of your lens. Small apertures have high Fstop number. (ex: F5.6 is wider/bigger than F8 or F11). In this case you would use F11 as that is the smallest aperture. Using small aperture will increase the area that is in focus (deep depth of field) and a wide aperture will decrease the depth (shallow depth of field = more blur)
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03/01/2004 11:28:16 PM · #3 |
I'm no 300d expert but it is suposed to have DOF(depth of field) preview. Read your manual and learn where this button is. Use manual mode and adjust your F number higher for more focus. F32 or F22 at least is normally the most focus you can get. You also can adjust your focus to the point on the subject that gives you the most dof. Use the DOF preview button. Even if it doesn't seem to be sharp before you hit the dof button it still can be.
You might do some research on hyper focus to learn more. You can actually do some math and focus your camera without ever looking threw the lens.(if your lens has the distance measurements) |
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03/02/2004 12:04:23 AM · #4 |
Originally posted by Niten:
I'm no 300d expert but it is suposed to have DOF(depth of field) preview. Read your manual and learn where this button is. Use manual mode and adjust your F number higher for more focus. F32 or F22 at least is normally the most focus you can get. You also can adjust your focus to the point on the subject that gives you the most dof. Use the DOF preview button. Even if it doesn't seem to be sharp before you hit the dof button it still can be.
You might do some research on hyper focus to learn more. You can actually do some math and focus your camera without ever looking threw the lens.(if your lens has the distance measurements) |
the DOF preview button is on the very front, a bit awkward to get at.
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03/02/2004 09:50:25 AM · #5 |
Originally posted by GoldBerry:
Originally posted by Niten:
I'm no 300d expert but it is suposed to have DOF(depth of field) preview. Read your manual and learn where this button is. Use manual mode and adjust your F number higher for more focus. F32 or F22 at least is normally the most focus you can get. You also can adjust your focus to the point on the subject that gives you the most dof. Use the DOF preview button. Even if it doesn't seem to be sharp before you hit the dof button it still can be.
You might do some research on hyper focus to learn more. You can actually do some math and focus your camera without ever looking threw the lens.(if your lens has the distance measurements) |
the DOF preview button is on the very front, a bit awkward to get at. |
Awkward how? If you are holding your camera properly it falls right under the left thumb.
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03/02/2004 10:18:59 AM · #6 |
Originally posted by Niten:
F32 or F22 at least is normally the most focus you can get. |
Note that shooting at those tiny apertures may actually lead to less sharp pictures because of the effects of diffraction. See this thread for more info. Just wanted to mention it.
And of course, the obvious side-effect of using such a small aperture to increase the depth-of-field is that you will need to keep the shutter open much longer (which means the subject and camera must be absolutely stable) or have a huge amount of light in order to get a properly exposed image. |
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03/02/2004 10:21:42 AM · #7 |
Originally posted by wackybill:
Awkward how? If you are holding your camera properly it falls right under the left thumb. |
Oddly, I've found it hard to find most of the time myself. If I'm hand-holding the camera, it doesn't fall under my thumb because, invariably, I'm grasping the focus ring of the lens. When I move back, I can never find the thing. It's weird... I think the fact that it's a nicely rounded button on a smooth curvy plastic mound, it makes it hard to get a good tactile reading.
For me, anyway. :)
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03/02/2004 10:27:00 AM · #8 |
i find i rarely use the DOF preview button, mainly just on close ups sometimes.
its not so bad at large apertures, but above f:16 or so it gets awful dark in the viewfinder when the aperture closes..
unless you have a lot of light.
when composing a shot the aperture is wide open, the preview button is just closing it down to the set f stop
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03/02/2004 10:37:48 AM · #9 |
Originally posted by space amoeba:
Originally posted by wackybill:
Awkward how? If you are holding your camera properly it falls right under the left thumb. |
Oddly, I've found it hard to find most of the time myself. If I'm hand-holding the camera, it doesn't fall under my thumb because, invariably, I'm grasping the focus ring of the lens. When I move back, I can never find the thing. It's weird... I think the fact that it's a nicely rounded button on a smooth curvy plastic mound, it makes it hard to get a good tactile reading.
For me, anyway. :) |
yea, the one or two times I actually went to use it, I had to flip the camera over. I would think if it's something you use alot, than ya, you'd get used to it.
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03/02/2004 10:40:08 AM · #10 |
I, too, find that I only use the DOF Preview occasionally. It comes in handy when I want to zoom in on a model's face or eyes and still get a decently blurred background.
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