flange back problems with XF300 - Page 2 at DVinfo.net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon XF Series HD Camcorders

Canon XF Series HD Camcorders
Canon XF305, XF205 and XF105 (with SDI), Canon XF300, XF200 and XF100 (without SDI).


Reply
 
Thread Tools Search this Thread
Old December 12th, 2010, 01:47 PM   #16
Regular Crew
 
Join Date: Aug 2010
Location: Munich / Hohenschäftlarn, Germany
Posts: 36
Shure I did. But unfortunatelly they couldn´t reproduce the problem.
Reinhard Kungel is offline   Reply With Quote
Old December 19th, 2010, 11:46 PM   #17
New Boot
 
Join Date: Nov 2010
Location: Kabul, Afghanistan
Posts: 6
I know I'm jumping in a little late here, but this revelation about parfocal problems really dampens my enthusiasm for the XF300. In my work I need to trust that focus will stay sharp, and given the extreme lighting situations where I am I routinely shoot fully open and as closed down as possible plus ND filters.

Given that I won't be able to trust manual focus to stay sharp through the zoom range, how have you found the autofocus? Is it useable or does it hunt? I still use an XHA1 and AF mode is useless because of hunting issues.
Alex Footman is offline   Reply With Quote
Old December 20th, 2010, 02:12 AM   #18
Regular Crew
 
Join Date: Aug 2010
Location: Munich / Hohenschäftlarn, Germany
Posts: 36
Hi Alex,

I´m one of these old-fashioned guys who only use manual focus. I never trust in automatic, never. But as you say: if theres is no guarantee in manual focus, than it becomes difficult.

Reinhard
Reinhard Kungel is offline   Reply With Quote
Old December 20th, 2010, 07:47 AM   #19
Trustee
 
Join Date: Oct 2009
Location: Mesa, AZ
Posts: 1,384
The AF really depends on the situation. As with all cameras, light makes a huge difference. I have mostly been using mine in full daylight or controlled lighting shoots. I shot a series of auditions for a tv show and just for grins decided to try the face detection AF mode. Not a critical shoot so wasnt concerned if it messed up. To my amazement, it never missed. I mean not once! I then used it for a greenscreen TelePrompTer shoot where the actor would be walking around a bit. Dead perfect! This is the real deal and not a gimmick! Not saying I'd use it all the time but for certain types of shoots, it makes life insanely easy! On a recent shoot, my XF found itself flying on a glidecam 4000 and I suggested to the operator to leave it in face detection AF mode. Worked great!
Since discovering how well it does work, the only times the AF had a problem were in unlit indoors situations (chasing my kids around the house) and one shoot where the background was too bright (used the backlight feature and it helped) So in extreme lighting conditions, use manual. But give the face detection mode a try (I use the instant mode) and as long as the white box is around your talent, you are perfectly focused!
__________________
A7RII, C100, 1Dx, 5Dmk3, 70D, Kessler goodies, Adobe, Pro Tools and more!
Robert Turchick is offline   Reply With Quote
Old December 20th, 2010, 08:05 AM   #20
Vortex Media
 
Join Date: Jan 2009
Location: New England, USA
Posts: 2,481
Robert, I agree 100% with your assessment of face detection. It's not for everyday use, but it really does work in the right situation.
__________________
Vortex Media http://www.vortexmedia.com/
Sony FS7, F55, and XDCAM training videos, field guides, and other production tools
Doug Jensen is offline   Reply With Quote
Old December 28th, 2010, 03:46 AM   #21
Major Player
 
Join Date: Mar 2007
Location: Sussex, UK
Posts: 317
Doesn't adding a nd behind the rear element change the lens characteristics? I know if I use anything thicker than a gelatine filter behind the lens the lenses does not function as parafocal.

Are all these issues found after ND's are flicked on? Are the ND's too thick?
James Miller is offline   Reply With Quote
Old December 28th, 2010, 04:41 AM   #22
New Boot
 
Join Date: Nov 2010
Location: Kabul, Afghanistan
Posts: 6
Robert,

Thank you for testing this out and posting about it. I have no shame in declaring that this feature will make my life easier. Given the situations I shoot in (no preparation, managing sound levels and ad-libbing interview questions on the spot) trusting in auto-focus would take a big load off my mind. Starting to take this camera seriously, especially if there's a good telephoto adapter on the market. Also, a trustworthy AF takes a lot of the sting out of the single-ring configuration.
Alex Footman is offline   Reply With Quote
Old December 28th, 2010, 04:42 AM   #23
Inner Circle
 
Join Date: Feb 2006
Location: Belfast, UK
Posts: 4,121
In cameras with built in ND filters, there is always a piece of optical glass in the image path otherwise you will get back focus problems. The rear ND filters have to be manufactured to a tight specification to avoid thickness variations, although this doesn't mean that one or more sub standard NDs got into the system.

This would be best tested by shooting with a fully open aperture and testing each ND filter for back focus variations. You'll need to control the lighting level for the correct exposure,

If there appears to be a variation between ND filters I'd send the camera back to Canon.
Brian Drysdale is offline   Reply With Quote
Old December 28th, 2010, 07:37 AM   #24
Major Player
 
Join Date: Mar 2007
Location: Sussex, UK
Posts: 317
Brian, yes sorry I didn't account for the clear optics in the image path, still if it not a problem before switching to the inbuilt ND's the ND's are at fault. You would have thought this would have been tested when the camera went in for service.

I had a bad copy of a Canon 2.8 70-200mm IS that had slight play (about 1mm) on the zoom ring not the focus ring, and would shift a pin sharp image out of true just by rocking the play.

I wonder if you are finding any slack on these lenses?
James Miller is offline   Reply With Quote
Old December 29th, 2010, 10:58 AM   #25
Inner Circle
 
Join Date: Dec 2005
Location: Bracknell, Berkshire, UK
Posts: 4,957
I've experienced similar problems on my EX cameras after bumpy journeys or shipping, clearly rough handling and shocks can upset the focus tracking. With the EX it's just a matter of running the back focus routine in the service menu to restore accurate focus tracking.
__________________
Alister Chapman, Film-Maker/Stormchaser http://www.xdcam-user.com/alisters-blog/ My XDCAM site and blog. http://www.hurricane-rig.com
Alister Chapman 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 XF Series HD Camcorders

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 01:32 AM.


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