What's a good deal on a battery-based portable outlet (to power a monitor or laptop)?
Some friends and I are doing video shoots outdoors. His camera has a very small LCD screen, and sometimes it's difficult to manually focus, even with the Focus Assist enlargement, because the screen is so tiny. I was thinking if I could pump the live signal from the camera into a computer or monitor using some converters to Component video and then put that to VGA or a laptop input somehow, we would be able to see the picture much larger and be able to focus better.
I'm thinking if I buy a portable power unit - something that I can plug a monitor or laptop into - it will give me enough time for hours in the field, rather than just relying on a 2-3 hour laptop battery. Sometimes the shoot can last most of the day.
I saw this one for $85:
...but then I realized that I know NOTHING about these things. Will it power a monitor or laptop? And for how long? I'm so confused! And how can I save money on it?