What causes a scoreboard's lights to smear? at DVinfo.net

G. Randy Brown · February 16th, 2004, 02:47 PM

I'll bet it's been discussed here before but I couldn't find it: What causes a scoreboard's lights to smear?
TIA,
Randy

Robert Knecht Schmidt · February 16th, 2004, 03:12 PM

What kind of a scoreboard? Like at a major league ball park? Smear in what way? You mean during animations, from one frame to the next (as can be seen with the naked eye)? Or do you mean haloing (in a camera like the XL1)? The former is caused by retention of energy in the elements of the display panel (light bulbs or otherwise)--they don't turn off sharply enough. The latter is caused by refraction within the lens, and can sometimes be palliated by removing your UV filter from your lens, if you have one on.

G. Randy Brown · February 16th, 2004, 04:04 PM

A Basketball scoreboard where lots of red lights make up the numbers (for lack of a better description). Yes, only through the cam lens and not to the naked eye.

>>The latter is caused by refraction within the lens, and can sometimes be palliated by removing your UV filter from your lens, if you have one on.<<

I do have one on and was really hoping for a simple solution....THANKS!!!! ...I'll try to remove it next time.
Thanks again,
Randy

Rob Lohman · February 17th, 2004, 04:11 AM

Otherwise try to see if changing shutter speed helps.

Is this "smearing" happening all the time or just when the numbers
change? Because DV has problems with the color red. I've seen
smearing (might not be the exact word for what I've seen) on
my XL1S with red when nothing was moving. It was more like
a blockyness surrounding the reds.

G. Randy Brown · February 17th, 2004, 08:33 AM

Hi Rob,
The numbers are indeed red and they always "smear" (looks like someone literally (sligtly) smeared lipstick or something ) to the right. It happens even when the cam is on a tripod. Actually for this job I won't have to use the shot but was wondering what to try if I need it next time. I've been shooting at 60 fps...how fast would you try Rob? BTW I didn't notice it in the viewfinder while I was shooting it.
Thanks guys,
Randy

Rob Lohman · February 18th, 2004, 04:11 PM

You won't notice it in the viewfinder because of the low resolution
of the LCD screen in there. It sounds to me like that it's the typical
red blight and changing the shutter won't help a bit. To be sure
I'd have to see a picture though. Can you put one up? If not,
shoot me one per e-mail please.

G. Randy Brown · February 19th, 2004, 08:58 AM

>>Can you put one up? If not,
shoot me one per e-mail please.<<

Hey thanks Rob, I've already deleted the clips from my hard drive but I will when I get a chance.
Thanks again,
Randy

February 16th, 2004, 02:47 PM	#1
G. Randy Brown Major Player Join Date: Jan 2003 Location: Las Cruces, NM Posts: 288	What causes a scoreboard's lights to smear? I'll bet it's been discussed here before but I couldn't find it: What causes a scoreboard's lights to smear? TIA, Randy

February 16th, 2004, 03:12 PM	#2
Robert Knecht Schmidt Wrangler Join Date: Feb 2002 Location: Cleveland, Ohio Posts: 1,933	What kind of a scoreboard? Like at a major league ball park? Smear in what way? You mean during animations, from one frame to the next (as can be seen with the naked eye)? Or do you mean haloing (in a camera like the XL1)? The former is caused by retention of energy in the elements of the display panel (light bulbs or otherwise)--they don't turn off sharply enough. The latter is caused by refraction within the lens, and can sometimes be palliated by removing your UV filter from your lens, if you have one on. __________________ All the best, Robert K S Search DVinfo.net for quick answers \| The best in the business: DVinfo.net sponsors

February 17th, 2004, 04:11 AM	#4
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	Otherwise try to see if changing shutter speed helps. Is this "smearing" happening all the time or just when the numbers change? Because DV has problems with the color red. I've seen smearing (might not be the exact word for what I've seen) on my XL1S with red when nothing was moving. It was more like a blockyness surrounding the reds. __________________ 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

February 18th, 2004, 04:11 PM	#6
Rob Lohman RED Code Chef Join Date: Oct 2001 Location: Holland Posts: 12,514	You won't notice it in the viewfinder because of the low resolution of the LCD screen in there. It sounds to me like that it's the typical red blight and changing the shutter won't help a bit. To be sure I'd have to see a picture though. Can you put one up? If not, shoot me one per e-mail please. __________________ 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

February 16th, 2004, 04:04 PM	#3
G. Randy Brown Major Player Join Date: Jan 2003 Location: Las Cruces, NM Posts: 288	A Basketball scoreboard where lots of red lights make up the numbers (for lack of a better description). Yes, only through the cam lens and not to the naked eye. >>The latter is caused by refraction within the lens, and can sometimes be palliated by removing your UV filter from your lens, if you have one on.<< I do have one on and was really hoping for a simple solution....THANKS!!!! ...I'll try to remove it next time. Thanks again, Randy

February 17th, 2004, 08:33 AM	#5
G. Randy Brown Major Player Join Date: Jan 2003 Location: Las Cruces, NM Posts: 288	Hi Rob, The numbers are indeed red and they always "smear" (looks like someone literally (sligtly) smeared lipstick or something ) to the right. It happens even when the cam is on a tripod. Actually for this job I won't have to use the shot but was wondering what to try if I need it next time. I've been shooting at 60 fps...how fast would you try Rob? BTW I didn't notice it in the viewfinder while I was shooting it. Thanks guys, Randy

February 19th, 2004, 08:58 AM	#7
G. Randy Brown Major Player Join Date: Jan 2003 Location: Las Cruces, NM Posts: 288	>>Can you put one up? If not, shoot me one per e-mail please.<< Hey thanks Rob, I've already deleted the clips from my hard drive but I will when I get a chance. Thanks again, Randy