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#1
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Taking Photos of TV Images
I have a D50 w/18-55mm lens and have attempted to take photos of images
appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill |
#2
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Taking Photos of TV Images
Bill Helbron wrote:
I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. HD only: Use freeze frame, and take your time. I forget the settings, maybe something like 1/40th @ 2.8... .but that's now a WAG. Doubt NTSC will ever produce good results, but I'd go with frozen frame on tv there, too. -- john mcwilliams Max thought the night-time burglary at the California surfing museum would be a safe caper, but that was before he spotted the security cop riding a bull mastiff, blond hair blowing in the wind, and noticed the blue-and-white sign wired to the cyclone fence, "Guard dude on doggy."8:11:36 AM |
#3
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Taking Photos of TV Images
In article , Bill Helbron
wrote: I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill- Television sets in the U.S. display alternate scan lines, 1/60 second per scan. It takes 1/30 second for a full picture to be displayed. Therefore you need to set your exposure time to something slower than 1/30 second. Use of a tripod is probably a good idea. I don't know how the European system works, but it probably has a similar time required for the picture to be displayed. Similarly, HDTV must have some kind of speed limit. Fortunately with digital cameras, it doesn't cost much to experiment. Fred |
#4
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Taking Photos of TV Images
Fred McKenzie wrote:
In article , Bill Helbron wrote: I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill- Television sets in the U.S. display alternate scan lines, 1/60 second per scan. It takes 1/30 second for a full picture to be displayed. Therefore you need to set your exposure time to something slower than 1/30 second. Use of a tripod is probably a good idea. I don't know how the European system works, but it probably has a similar time required for the picture to be displayed. Similarly, HDTV must have some kind of speed limit. Fortunately with digital cameras, it doesn't cost much to experiment. Yes. If there is motion in the TV picture, it will be displayed in a blur, so it's a good idea to choose a static picture when possible. Our eye and brain facilities do an amazing job of making TV and movie images appear to be sharp and smooth. Stop the transitions (freeze a frame) and yo see what material they work with. -- Frank ess |
#5
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Taking Photos of TV Images
Television sets in the U.S. display alternate scan lines, 1/60 second
per scan. It takes 1/30 second for a full picture to be displayed. Therefore you need to set your exposure time to something slower than 1/30 second. But not too much slower, unless the image isn't moving. --------------- Marc Sabatella Music, art, & educational materials Featuring "A Jazz Improvisation Primer" http://www.outsideshore.com/ |
#6
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Taking Photos of TV Images
My thanks to you all! I did NOT use a tripod, but was about 18" from the screen
surface. It would appear that I get the best results with the exposure set at 1/25 (mode "S"). I tried 1/30, 1/25, and 1/20. As mentioned earlier, these are good enough for my immediate purposes, but will continue to experiment. There was also some minor reflection from the glass noticable and some chromatic distortions (like moire patterns) on one side in the 1/20 exposure. Bill On Mon, 19 Jun 2006 14:27:11 GMT, Bill Helbron wrote: I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill |
#7
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Taking Photos of TV Images
"Bill Helbron" wrote in message
... My thanks to you all! I did NOT use a tripod, but was about 18" from the screen surface. It would appear that I get the best results with the exposure set at 1/25 (mode "S"). I tried 1/30, 1/25, and 1/20. As mentioned earlier, these are good enough for my immediate purposes, but will continue to experiment. There was also some minor reflection from the glass noticable and some chromatic distortions (like moire patterns) on one side in the 1/20 exposure. Bill On Mon, 19 Jun 2006 14:27:11 GMT, Bill Helbron wrote: I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill The best way to capture a TV image is with a video card with TV input. A camera to do the same is just a cludge. -- Regards, Matt Clara www.mattclara.com |
#8
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Taking Photos of TV Images
"Bill Helbron" wrote in message
... I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill The frame rate for NTSC is 1/30 second, so you're going to need a shutter speed slower than that. The reason being, at exactly 1/30 second you'll capture part of a frame and parts of the adjacent frames, unless you're lucky enough for the shutter to open right at a vertical blanking interval. As for moire, it's probably unavoidable unless you have lots of megapixels, because you're putting dots on top of dots. Some will line up and some won't. |
#9
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Taking Photos of TV Images
On Mon, 19 Jun 2006 14:27:11 GMT, Bill Helbron
opined: I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. It's easy if you know how. The simplest method is to use a tripod & a 1/2 second exposure. -- W . | ,. w , "Some people are alive only because \|/ \|/ it is illegal to kill them." Perna condita delenda est ---^----^--------------------------------------------------------------- |
#10
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Taking Photos of TV Images
Bill Helbron wrote:
I have a D50 w/18-55mm lens and have attempted to take photos of images appearing on my TV with only moderate success and was wondering if anyone has a recommended technique. Bill Tripod, and about 1/15th to 1/30th second. Much faster and you're likely to only get a partial picture due to interlacing. -- Images (Plus Snaps & Grabs) by MarkČ at: www.pbase.com/markuson |
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