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Taking pictures
from the television screen using your digital camera is quite easy.
If you have ever
tried taking pictures straight from your television screen, you might have sometimes
noticed horizontal lines running up and down the picture. That is because a
TV screen is "painted" one pixel at a time from top to bottom. The
lines appear on your pictures when you use a shutter speed that is too fast
and that "freezes" the lines on the television image.
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In this One-Pager™
tutorial, we'll give you the one simple trick that you need to know to be able
to take television picture using your digital camera. Ready? All right, simply
use a shutter speed of 1/30 sec. and preferably slower. The idea is to use a
shutter speed that synchronizes with the the painting of the TV image and voila
-- no moving horizontal lines.
You might want
to experiment with different shutter speeds, such as 1/15 sec., 1/25 sec., (but
less than 1/30 sec.) to see where you get optimum quality on your TV using your
digital camera. Of course, to be able to set the shutter speed on your camera,
you need to be able to switch to Shutter-Priority mode. The following pictures
were taken with the Kodak Easyshare DX6490, and I find that a shutter speed
of 1/15 sec. is optimum. With 1/30 sec., a few lines is apparent at larger image
size.
For images of a
computer screen, try 1/20 sec. and slower, and get a meter reading directly
from the screen.
Dora
Shutter-Priority, Spot
9.8mm, 1/15 sec., F3.6, ISO 80
Max
& Ruby
Shutter-Priority, Spot
9.8mm, 1/15 sec., F5.6, ISO 80
Smallville
Shutter-Priority mode, Spot
11.5mm, 1/30 sec., F3.2, ISO 80
Star
Trek Enterprise
Shutter-Priority mode, Spot
11.5mm, 1/30 sec., F3.2, ISO 80
What if your
camera does not allow you to set a shutter speed directly? Well, then you have
no choice but to experiment. For example, try one of the scene modes. Or, try
this very arkward experiment::
- take a couple of pictures in the room (not of the bright TV screen)
- upload to your PC and look for a picture where the EXIF info says a shutter
speed of 1/30 sec. or whereabout was used
- go back and lock your camera's light meter at that subject [must be same distance
from subject as you will be from TV because AF will usually also lock] by a
half-press of the shutter button
- then recompose on your TV screen and take the shot at the locked exposure.
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