Problems with auto focus during zoom
 

Hello,

I use my GL2 for sports coverage (primarily horses.) Since my target is moving I use the auto focus. I am having alot of problems with losing the focus while I am zooming (as subject is moving further away). I've noticed the problem since I got the camera in July, but it seems to be getting worse. I have to zoom is very slowly to not lose the focus. I have an Optura 30 as well and I have never had it lose the focus. Is this operator error or a camera problem?

Thank you for any insight you can give!

Rita

Rita,
The GL2 can't zoom and focus at the same time unfortunately - the lens just isn't designed that way. Even if you used manual focus, you can't control both the functions at the same time.

Robin

Wow, really?!? That's bad news for me since I need to zoom in and out constantly and stay in focus at the same time. If this is true, then I am somewhat out of focus even when I am zooming slowly?

This seems unbeleivable to me -- it's a video camera! It's hard to imagine a situation where you would not need the camera to stay focused while you are zooming. Is this normal for most video cameras in this range?

Rita

Zoom focus
 

Rita,

I would zoom out to the distance where focus is needed at the furthest, then focus. Usually yhis is past the point where everything is in focus from that distance out. then bring them zoom back in as far as you can and still be in focus. This method gives me a broader range of focus which is better when you are not close to the subject. I film fast moving wildlife and have had some great footage. Shoot lots, edit lots, focus continually if needed.

gus

Thanks for the help -- would it help if I set the zoom speed to low or medium? I've been using it on variable.


Rita

Try slow zoom speed, see if it works for you.
Try aperture priority shooting mode and stop down for greater depth of field. Add gain if that can be tollerated to allow smaller aperture.

The camcordrers focus ability depends in large part on the image content. Good contrast (like from vertical edges) is needed in the focus sensing zone. Zooming and camera moves can cause loss of these focus queues and inhibit accurate or fast focusing.

All camcorders of this type from various manufacturers use one lens motor which has its duties constantly split between zoom and focus movements. No camera in this class can do both things at once, unfortunately.

Thanks for the info. Don, I will try your suggestions. Chris, why have I not noticed this with my Optura?

Rita