Issues focusing in AV mode, any advice please??

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DGN1984

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Hi Everyone,

I posted last week for advice on how to stop motion blur when shooting at a music gig in low light. I have a canon 450d and shot in AV mode. I set the ISO to 1600 at f1.8 using a 50mm prime lens. This setup seemed to limit the amount of motion blur I got however I found it really difficult to obtain focus. Using AF point selection I found that the circle that lights up through the viewfinder to indicate focus is obtained just flashed suggesting focus couldn't be obtained. Looking back through my shots quite a few are out of focus or haven't focused where I intended. Can anyone advise why I was unable to obtain tyhe focus points I wanted? Since I bought the camera I haven't used manual focus at all as I'm not familiar with how it works, would this have helped?

I am a complete beginner therfore any help or advice on this would be really appreciated.

Thanks in advance

Danny
 
What focus mode were you using? It sounds to me like you were using AI Focus or AI Servo rather than One Shot. In AI Servo the focus adjusts continuously rather than picking a target and looking on. AI Focus behaves the same way if the subject is moving.
 
The outer points are not as sensitive as the centre, in very low light with a low contrast scene the camera will struggle to focus especially using the outer points.

Always good to read the manual. Best to use centre in these situations.
 
And also at f1.8 you have a very small DOF and any movement will also show up - what was the shutter speed ?
 
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