Problems with auto focus during zoom at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon GL Series DV Camcorders

Canon GL Series DV Camcorders
Canon GL2, GL1 and PAL versions XM2, XM1.


Reply
 
Thread Tools Search this Thread
Old November 17th, 2005, 10:02 AM   #1
New Boot
 
Join Date: Jul 2005
Posts: 6
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 Hanson is offline   Reply With Quote
Old November 17th, 2005, 10:53 AM   #2
Trustee
 
Join Date: Dec 2002
Location: Gwaelod-y-garth, Cardiff, CYMRU/WALES
Posts: 1,215
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
Robin Davies-Rollinson is offline   Reply With Quote
Old November 17th, 2005, 11:44 AM   #3
New Boot
 
Join Date: Jul 2005
Posts: 6
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
Rita Hanson is offline   Reply With Quote
Old November 17th, 2005, 10:23 PM   #4
Inner Circle
 
Join Date: Jun 2005
Location: Saskatchewan
Posts: 3,004
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
Dale Guthormsen is offline   Reply With Quote
Old November 23rd, 2005, 08:17 PM   #5
New Boot
 
Join Date: Jul 2005
Posts: 6
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
Rita Hanson is offline   Reply With Quote
Old November 24th, 2005, 06:05 AM   #6
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,294
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.
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old November 24th, 2005, 12:10 PM   #7
Obstreperous Rex
 
Join Date: Jan 2001
Location: San Marcos, TX
Posts: 26,900
Images: 513
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.
__________________
CH

Search DV Info Net | DV Info Net Sponsors | A Decade (+5) of DVi | ...Tuesday is Soylent Green Day!
Chris Hurd is offline   Reply With Quote
Old November 25th, 2005, 01:52 PM   #8
New Boot
 
Join Date: Jul 2005
Posts: 6
Thanks for the info. Don, I will try your suggestions. Chris, why have I not noticed this with my Optura?

Rita
Rita Hanson is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XL and GL Series DV Camcorders > Canon GL Series DV Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 02:14 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network