Fluorescent Flicker (shooting in Asia) at DVinfo.net
DV Info Net

Go Back   DV Info Net > Canon EOS / MXF / AVCHD / HDV / DV Camera Systems > Canon HDV and DV Camera Systems > Canon XH Series HDV Camcorders
Register FAQ Today's Posts Buyer's Guides

Canon XH Series HDV Camcorders
Canon XH G1S / G1 (with SDI), Canon XH A1S / A1 (without SDI).

Reply
 
Thread Tools Search this Thread
Old February 10th, 2008, 11:22 AM   #1
New Boot
 
Join Date: Feb 2008
Location: Seattle, WA
Posts: 8
Fluorescent Flicker (shooting in Asia)

Hello,

I've been reading this forum for some time, but this is my first post.

I'm on a documentary shoot in China and am having a hell of a time with indoor fluorescent lighting. The electric current out here is 50hz, which would need a 1/50 shutter speed to avoid fluorescent flicker. Unfortunately, the A1 runs a 1/48 shutter speed and not 1/50, so I'm still getting some annoying flicker. (It's usually low light as well, so I can't put it at 1/100.)

Any help out there? Is there any kind of workaround that would allow me to shoot at 1/50 shutter? Or some other kind of fix I'm unaware of?

Thanks in advance!
Chris
Christopher Rufo is offline   Reply With Quote
Old February 10th, 2008, 02:35 PM   #2
Regular Crew
 
Join Date: Dec 2007
Location: Lake Forest, CA
Posts: 106
Have you tried the clear scan function? It lets you adjust the shutter frequency in much smaller increments. It is made to eliminate flicker in video screens but might work for you.
Steve Sobodos is offline   Reply With Quote
Old February 10th, 2008, 02:51 PM   #3
Trustee
 
Join Date: Jun 2006
Location: Burbank
Posts: 1,811
You can also shoot at 1/100 shutter.

Last some I shot several hours in Lithuanian (50hz) in a large room with mixed lighting, some of it old flourescents and other odd types of lighting.

I shot everything at 1/100 and everything looks good.

I used 3db gain for everything and it looks great. I think you could go to 6db gain without any problems.

But to get back to the question, I think 1/100 is your answer.
Jack Walker is offline   Reply With Quote
Old February 11th, 2008, 08:11 AM   #4
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,488
However, shooting at more than 2x the power line frequency may result in drifting color balance due to slight variations in light output from the fluorescent lamp over the power half-cycle.
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old February 11th, 2008, 11:18 AM   #5
New Boot
 
Join Date: Feb 2008
Location: Seattle, WA
Posts: 8
Thanks

Thanks for all of your quick responses.

The clear scan function only goes as low as 60.1hz, which isn't low enough to match the electrical current (and at 100hz it actually makes the flickering worse, for whatever reason).

1/100 shutter definitely solves the flicker problem, but you get the low light problem, as you mentioned. I'm shooting in a poor region of Western China, which in practice means a very poorly lit region of Western China. I've tried boosting the gain +6db, but the image suffers quite a bit--noisy as hell, on top of it being soft anyway in those kind of lighting situations.

So, I guess it's a trade-off: slight flicker at 1/48 shutter or a noisy gained image at 1/100... a trade-off Canon could have avoided if they had included 1/50 shutter speed (ugh!).

Thanks again for your suggestions. If anyone else has any other possible solutions, I would be extremely grateful to hear about them.

Best,
Chris
Christopher Rufo is offline   Reply With Quote
Old February 11th, 2008, 01:20 PM   #6
Contributor
 
Join Date: Jan 2003
Location: Kansas City, MO
Posts: 4,449
Probably the PAL upgrade would give you the 1/50 shutter. I think Canon does that for $500 (USD). You'd be shooting in PAL, of course.
Bill Pryor is offline   Reply With Quote
Old February 11th, 2008, 02:22 PM   #7
Wrangler
 
Join Date: Sep 2001
Location: Northern VA
Posts: 4,488
Yes, the PAL version camcorders do have 1/50 shutter. Isn't PAL the standard format in China?
__________________
dpalomaki@dspalomaki.com
Don Palomaki is offline   Reply With Quote
Old February 11th, 2008, 03:40 PM   #8
Trustee
 
Join Date: Jun 2006
Location: Burbank
Posts: 1,811
Made Post in Wrong Thread!!???
Jack Walker 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...

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

Scan Computers Int. Ltd.
+44 0871-472-4747
Bolton, Lancashire UK


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 XH Series HDV Camcorders


 



All times are GMT -6. The time now is 07:46 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network