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Old August 6th, 2004, 02:59 PM
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sinha_punit sinha_punit is offline
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DOF preview button....... useful?

After few posts on this topic in another thread i decided to make this into a new thread.

The DOF preview button helps in examining the DOF. Thats what the definition says.

Now using a particular f stop, depress shutter halfway to focus, and you can see what is in focus and what is not, increase and decrease the fstop values, focus and see the difference.( go from maximum to minimum)

You can clearly see the DOF thru the view finder, after focusing and without using the DOF preview button. can anyone tell me how they find DOF preview button useful and what additional info the DOF preview button gives?
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Old August 6th, 2004, 03:47 PM
GerryDavid GerryDavid is offline
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Its my understanding that the aperature is at the widest when your previewing and it only decreases to the aperature set when you actually click the shutter release. So thats why the preview button comes inhandy. That is unless you got the older cameras where you change the aperature on the lense and it does it in real time

Personally I havent used the preview button since I just focus on what I want to be in focus.
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Old August 6th, 2004, 03:48 PM
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Kara Kara is offline
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Cant say Ive ever used mine either
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Old August 6th, 2004, 05:33 PM
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lucian lucian is offline
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I've used mine but almost always when doing product style subjects. I hardly ever use it for normal photography.

By the way what Gerry described is what's called an automatic lens. During viewing the len is wide open to let the maximum amount of light to the viefinder. When the shutter is depressed the lens "automatically" stops down to the f stop you have selected.

A manual lens, some of us saw them as wee children, is different in that what you have selected for the f stop is what you are viewing at. So if you had it wide open to focus and wanted to use f 16 you would have to "manually" change to f16 BEFORE depressing the shutter.
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Old August 6th, 2004, 09:25 PM
PictureCow PictureCow is offline
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I've used it occasionally. Only for product stuff which I don't do often. It's nice to know it's there if you need it though.
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Old August 7th, 2004, 01:53 AM
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drlynn drlynn is offline
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The DOF preview button is most useful when you're trying to isolate a subject in focus with the extreme foreground and background out of focus.

You want to know that the whole subject is in focus without making the ackground sharp, so you pick an aperture and then hit the DOF preview button to make sure that :
A. the subject is in focus throughout and
B. the background is a nice, blurry background.

Just picking an aperture and hoping you're right might leave the DOF too shallow, causing the subject to be blurry, or too deep, causing a distracting background.
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