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auto focus vs manual focus


I have generally shot in manual focus and manual exposure; however, my eye sight is not quite as good as it used to be. So my question now is this: "If I shoot in auto focus can I still use manual exposure (assuming typical lighting conditions) i.e., will there be a drop off in image quality or will it simply not make any difference?.

Allen Minor..

Comments (5)

I've not seen too many cameras yet where you could not turn off autofocus and use some form of manual focus. DSLR's in particular will have no problems going either way..

You can also, at least on the AF Nikons I've used, focus manually and use the aid of a built-in focus confirmation light..

You should know that SLR cameras built for AF don't necessarily have a focusing screen that's optimized for manual focus...

Comment #1

Allen Minor wrote:.

I have generally shot in manual focus and manual exposure; however,my eye sight is not quite as good as it used to be. So my questionnow is this: "If I shoot in auto focus can I still use manualexposure (assuming typical lighting conditions) i.e., will there be adrop off in image quality or will it simply not make any difference?.

Allen Minor.

I shot slides for 32yrs all with manual focus and manual exposure. I was never so happy to get a camera that would do both automatically when I got digital. my method is to let the dslr do the exposure and focus while I concentrate on what I shoot not how. the dslr does that. of course, I ALWAYS note the selected shuuter speed and fstop, so I can switch to hyperprogram and make adjustments if needed/wanted. so far I have never found a situation that the autofocus could not do by itself.

It is supposed to able to those things. that is what the user just paid $1000-2000(?) dollars for..

This of course does not take into account the user who simply wants to do the jobs himself. for myself setting the exposure and focus is the simple items; it is knowing what to shoot and how to get the good shot of that subject that is the hard part.i am 61yrs old and retired...

Comment #2

Allen Minor wrote:.

I have generally shot in manual focus and manual exposure; however,my eye sight is not quite as good as it used to be. So my questionnow is this: "If I shoot in auto focus can I still use manualexposure (assuming typical lighting conditions) i.e., will there be adrop off in image quality or will it simply not make any difference?.

No difference. They're unrelated subsystems..

If you like manually focusing, consider a DSLR which has changeable focus screens and buying lenses with an ultrasonic ring motor. The focus screens that come in most cameras are designed to be bright, but make it pretty much impossible to accurately manual focus. Luckily, some cameras have alternate screen that, while dimmer, feature the old fashioned split screen (if your camera doesn't have official screens, there are 3rd party options)..

The ring motor lenses (such as Canon USM) let you first AF, but grab the focus ring and adjust as needed without hunting for the manual focus switch...

Comment #3

Theatrus wrote:.

The ring motor lenses (such as Canon USM) let you first AF, but grabthe focus ring and adjust as needed without hunting for the manualfocus switch..

Olympus allows you to do that also.If you think that makes sense, then you must have read someone else's post!..

Comment #4

Stainedsilver wrote:.

Theatrus wrote:.

The ring motor lenses (such as Canon USM) let you first AF, but grabthe focus ring and adjust as needed without hunting for the manualfocus switch..

Olympus allows you to do that also.If you think that makes sense, then you must have read someone else'spost!.

As does Pentax, and you don't have to buy a lens with a motor in it to use it. They call it Quick-shift focusing, and many of the recently-designed lenses allow this...

Comment #5

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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