Autofocus not holding

[mforster86]

Hi,

I have a Canon Rebel, I've had no problems with the lens that comes with it (18-55mm) but whenever I use the 50mm f/1.8 II lens it will autofocus when holding the shutter button partially but then when compressing fully to take the photo there is always a slight auto adjustment on the lens knocking it slightly off focus.  The only way I've been able to get around this is to autofocus then turn to manual focus on the lens before taking the photo.. which isn't ideal.

Any suggestions?

[Waddizzle]

Try setting the focus mode to One Shot.  The "AI" modes try to continuously update the focus until you press the shutter.

[mforster86]

I'm not sure I entirely understand, do you mean changing it from multi shot to single shot? I can't see any settings for focus just white balance. The camera is a eos 300d

[kvbarkley]

Strangely, I don't see how to set it when in P mode.

[Waddizzle]

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@mforster86 wrote:
I'm not sure I entirely understand, do you mean changing it from multi shot to single shot? I can't see any settings for focus just white balance. The camera is a eos 300d

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Good point.  What shooting mode are you using?  Try full AUTO shooting mode, as a test.  If the camera beeps when it focuses, then you are in One Shot mode.