XL2 Back Focus 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 XL and GL Series DV Camcorders
Canon XL2 / XL1S / XL1 and GL2 / XM2 / GL1 / XM1.


Reply
 
Thread Tools Search this Thread
Old October 3rd, 2004, 11:53 AM   #1
New Boot
 
Join Date: Feb 2004
Posts: 12
XL2 Back Focus

Hi All,

Just got my new XL2.
I am noticing a back focus problem with the 20X lens and 3X lens.
I taped a newspaper headline accross the room.
I zoom in and focus. When I go wide, its soft and have to rack it into focus. With both lens.
Is there an adjustment on the lens that I dont know about?
Or is it done in camera?
Or is it adjusted by Canon?
Thanks in advance for your help

David
David Stollak is offline   Reply With Quote
Old October 3rd, 2004, 11:59 AM   #2
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
Backfocus is not consumer adjustable on those lenses. If it really
is a back focus issue they will need to go to Canon. I would
include the camera as well so they can see/test it.
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old October 3rd, 2004, 12:16 PM   #3
New Boot
 
Join Date: Feb 2004
Posts: 12
Is the adjustment done on the lens or on the camera ?
David Stollak is offline   Reply With Quote
Old October 3rd, 2004, 12:22 PM   #4
Warden
 
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,267
The adjustment is done on the lens. But for maximum compatibility it is best to send in the camera and any additional lenses for the camera at the same time.
__________________
Jeff Donald
Carpe Diem




Search DVinfo.net for quick answers | Where to Buy? From the best in the business: DVinfo.net sponsors
Jeff Donald is offline   Reply With Quote
Old October 3rd, 2004, 12:25 PM   #5
New Boot
 
Join Date: Feb 2004
Posts: 12
Thanks so much!
David Stollak is offline   Reply With Quote
Old October 4th, 2004, 04:48 AM   #6
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,294
Can't speak to the XL2, but with the XL1 andn auto lens, back focus adjustment is set electronically with values that are progammed into the body's memory. Thus a back focus issue could be caused by an error/problem in the camcorder with the stored value, the CCD-to-mount distance, the temperature compensation values, or the lens being out of spec.

Thus it is best to return both to have it resolved, and it is always good to send Canon service a complete description of the problem, along with a tape showing the problem
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old October 4th, 2004, 05:39 PM   #7
New Boot
 
Join Date: Feb 2004
Posts: 12
Thanks again!
David Stollak is offline   Reply With Quote
Old October 7th, 2004, 02:54 PM   #8
Regular Crew
 
Join Date: Sep 2004
Location: Chicago, IL
Posts: 40
I just got my XL2 and the first test I did was the backfocus, I had no troubles. Thanks to all of you to address this problem and hopefully it was fixed in subsequent batches of the XL2
__________________
Ask not whether you can afford to make it, but whether can you afford not to.
Alfredo Castil is offline   Reply With Quote
Old October 10th, 2004, 07:54 AM   #9
RED Code Chef
 
Join Date: Oct 2001
Location: Holland
Posts: 12,514
Alfredo: it is not a "bug" in the system or something. Backfocus
can change due to certain elements like heat/cold etc. and might
require some re-calibration after a while.
__________________

Rob Lohman, visuar@iname.com
DV Info Wrangler & RED Code Chef

Join the DV Challenge | Lady X

Search DVinfo.net for quick answers | Buy from the best: DVinfo.net sponsors
Rob Lohman is offline   Reply With Quote
Old October 23rd, 2004, 05:44 PM   #10
New Boot
 
Join Date: Feb 2004
Posts: 12
Well,

I returned the XL2 and got a new one.
I still have the back focus problem with the 3X lens (manual focus).
I called Canon and they said to send them the camera and the lens, which I did.
They returned it to me saying "Checked back focus on 3X lens,
compared to factory3X, no difference found".

There is a definite problem with manual focus.
Obviously the camera is flawed.
David Stollak is offline   Reply With Quote
Old October 23rd, 2004, 05:48 PM   #11
Obstreperous Rex
 
Join Date: Jan 2001
Location: San Marcos, TX
Posts: 26,900
Images: 513
Your best bet David is to return the camera and get your money back while you still can. Sounds like you still have a window of opportunity with your dealer there.
__________________
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 October 26th, 2004, 11:16 AM   #12
New Boot
 
Join Date: Feb 2004
Location: Morgantown, PA
Posts: 9
back focus

Just wanted to say and/or ask if you are focusing by zooming in all the way and pushing the button to focus and then zooming out to check the back focus...? If you are focusing using the focusing ring and then zooming out... it will go soft. Remember to focus using the button! Hope this helps.

tx, Dave
__________________
Dave Speace
Producer/Director/DP
Dave Speace is offline   Reply With Quote
Old October 26th, 2004, 02:23 PM   #13
New Boot
 
Join Date: Feb 2004
Posts: 12
Dave,

Thanks for your input,

I am zooming in and focusing using the focus ring, then zooming out. By using the button, are you refering to the AF button on the lens?

Doesn't that defeat the manual focus aspect?

David
David Stollak is offline   Reply With Quote
Old October 26th, 2004, 05:56 PM   #14
New Boot
 
Join Date: Feb 2004
Location: Morgantown, PA
Posts: 9
xl2 focusing

Yes... use the button to focus with and see if the camera stays in focus when you zoom out!


Dave
__________________
Dave Speace
Producer/Director/DP
Dave Speace is offline   Reply With Quote
Old October 26th, 2004, 06:58 PM   #15
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,294
Try put up a resolution chart to check backfocus. If back focus is OK, the number of lines you can resolve in a picture width should remain about the same regardless of zoom setting. With the 3x telephoto, you may be able to resolve 1" lines at a given distance when at full xzoom. At full wide the lines would have to be 3" wide to appear equally as sharp.
__________________
dpalomaki@dspalomaki.com
Don Palomaki 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

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 07:27 PM.


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