TV Camera Vibe Criteria
TV Camera Vibe Criteria
(OP)
Say you have a tv camera mounted on a floor, pointed at a sporting event below. What floor vibe criteria must be satisfied to prevent wiggly or blurry images? Ref to a source would be greatly appreciated.






RE: TV Camera Vibe Criteria
I'd say coordinate that with the frequency of your vibration.
RE: TV Camera Vibe Criteria
RE: TV Camera Vibe Criteria
Floor vibe due to human activity is almost always in the 3 Hz to 10 Hz range, so 60 Hz and 30 Hz don't help.
It is bound to be affected by distance from the action. For the current problem, I'm talking about cameras mounted near the top level of a big college football stadium.
I know of criteria for microscopes based on ability to perceive the motion, but I haven't been able to find anything for cameras. I looked for telescopes also, but haven't found anything.
RE: TV Camera Vibe Criteria
271828 is mounting this camera in e's room so he can watch her while he is at work! Sporting event would be "sipee cup throwing" or "Let's drop this on the floor and see how long before mommy (or daddy) picks it up".
All joking aside, no, they don't have shutters but they work similarly. So whatever things may be close by, you don't want them to vibrate your camera faster than your "effective" shutter speed.
http://www.mediacollege.com/video/camera/shutter/
RE: TV Camera Vibe Criteria
The shutter speed is interesting, filed away for future use, but I don't think that applied here because those frequencies are so much higher than vibe caused by crowd participation or walking.
For microscopes, they break out vibe into low frequency floor vibe causing "jiggle" and high frequency causing "blur."
Floor vibe is definitely in the "jiggle" category, being usually far less than 10 Hz.
I think the criterion should be a micro-in./sec. vibrational velocity limit similar to microscopes.
I'm inclined to think at this point that nobody's done a study on the subject.
Does anybody know off-hand who makes the fancy cameras used at big time events? I think I'll call them.
Thanks again guys.
RE: TV Camera Vibe Criteria
RE: TV Camera Vibe Criteria
"It'll be a while before she can torment us with those tactics."
Not that long. You've heard it before, and I'll tell you too, enjoy it now. Don't wait for tomorrow. Make it today.
And also:
Spend time with your wife before someone else does.
RE: TV Camera Vibe Criteria
One of my current projects is to do exactly this and is the source of my original question. The enclosed areas cantilever out about 25 ft. That part of the stadium has a low natural frequency and will be somewhat easy to excite by crowd participation. I've seen footage through cameras that were shaking, so it's very possible. I just don't know how much is too much.