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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 27 Sep 2006 (Wednesday) 16:14
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Focusing

 
Dimitry
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Sep 27, 2006 16:14 |  #1

Hey guys,

I'm just trying to understand something here. If I want to focus on an object that's in either one of the corners of the viewfinder, is the only way to achieve sharp focus to manual focus? What I tried doing was moving my most right/left focus point on the object, auto focusing, then turning on manual focus, moving the camera up/down depending on which corner I wanted the object in and shooting. Not all the photos came out sharp though.

Is there a flaw in my method?


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Jim ­ G
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Sep 27, 2006 16:24 |  #2

I don't know much about the 300D but I presume it has several AF points - select the one closest to your target, put it over your target, autofocus, recompose and take your shot. This will result in some inaccuracy if you have a very narrow depth of field but will work well if you're careful or are using a smallish f/stop.

This won't really work if you have your autofocus set to the shutter button - I don't know if you can change it on the 300D but if you can try setting it to one of the back buttons, that way you can focus and recompose with ease.

Otherwise manual focus can be a quick and easy way of achieving the same end but I find the poky little viewfinder makes it a bit difficult. If you can't set the autofocus button elsewhere (custom function 4 on the 20D, that probably doesn't help) then your method may be not a bad one, though I'm sure other people can offer up some ideas :)


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Dimitry
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Sep 27, 2006 17:40 |  #3

So basically the custom function would just allow me to leave the lens on autofocus but still take the shot without refocusing...correct?


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TheSteveMadden
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Sep 27, 2006 17:46 |  #4

If your shooting handheld, it's easy to place the active AF point over the subject, half press, then recompose while keeping the half press on the shutter and press the rest of the way to shoot.

Make sure you're in "Single Shot" mode and not "AI Servo", as AI Servo will try to refocus when you recompose.


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MTalley
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Sep 27, 2006 20:08 |  #5

OK, fellow 300D owner here. While the other two posters are generally correct, things are a little different on the 300D than the XT or 20D.

I generally set the center focus point only active. Yes, you can then focus on the intended subject and then, while half-holding the shutter button, recompose, then shoot. One problem may generally crop up on the 300D when you do this - the AI Focus mode. When you recompose, the camera may decide that the subject is moving and start running in AI Servo (continuous focus) mode.

There is no custom function to set a rear button to focus on the 300D, even with the hacked firmware (as I remember). So, generally, you have two options. One, do like I described (and the other posters) and recompose after locking focus. Or, two, set the focus point to one of the other single focus points (there are seven) closest to the portion of the frame containing the item of interest that you want to focus on, and use that.


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Focusing
FORUMS Photography Talk by Genre General Photography Talk 
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