Page 2 of 2 FirstFirst 12
Results 11 to 17 of 17

Thread: TE dangerous lasers?????

  1. #11
    Join Date
    Jun 2007
    Location
    Lake Geneva, WI.
    Posts
    2,704

    Default

    Quote Originally Posted by oliverst14@hotmail.com View Post
    its a fuji film 12m f60fd.
    im not 100% it was the laser but its still a bit dodgy. mite be a problem with fuji films as the one in the moby video did the same and that was fuji film too

    cheers ollie

    I'm amazed that a 1.6" CCD was killed in such a short exposure. If it was one of those micro cell phone camera CCD's I'd understand. Sounds like the lasers were waaaay above MPE especially for the distance. Must have been using q-switched 532's. At least that's my take on it.

  2. #12
    Join Date
    Jun 2008
    Location
    chesterfield uk
    Posts
    466

    Default

    yes i agree mate

    camera was pretty good till this. its only 3 months old too

    cheers ollie
    2 x 10w full colour laser systems
    2 x 4w full colour laser systems
    2 x 3w full colour laser systems
    1 450mw pinkem rgb 30k scanner
    2 x 1 watt green laser
    4 x 1 watt blue 445nm laser systems
    3 watt rgb .

  3. #13
    Join Date
    Aug 2008
    Location
    UK
    Posts
    5,704

    Default

    On the subject of CCD size, from what I read earlier there is a misconception here. The smaller the CCD size the LESS sensitive it is in low light conditions. Any photographer / videographer will tell you the the larger the sensor the better it is at gathering light and thus the less grain you see in the final image / video. This is because on a smaller CCD the inidvidual pixels have to be smaller and the smaller the pixels the less photons they gather. The result is the camera has to apply gain to amplify the signal and this causes artefacts (grain) to appear.

  4. #14
    Join Date
    Feb 2007
    Location
    Herts, UK
    Posts
    1,254

    Default

    Maybe, but what's in question here is focussed coherent light, not gathering ambient light.

  5. #15
    Join Date
    Aug 2008
    Location
    UK
    Posts
    5,704

    Default

    I agree but unless the laser is 1 pixel wide (unlikely at x million per square centimetre) the lasers going to illuminate an area much larger than 1 pixel and thus the larger the light gathering pixel the more photons will be captured in any given time per pixel and surely therefore the greater the energy delivery to the pixels concerned.

  6. #16
    Join Date
    Jan 2008
    Location
    Nootdorp, Zuid-Holland, Netherlands
    Posts
    162

    Default

    I'm absolutely no expert and I don't know anything about how to calculate laser power bla bla bla.... But I think that the Ilda's response (page 4 in your link) is a but unfair. What they say is that the camera's people bring along to gigs are not the responsibility of a the laserist at work. But if you look at the youtube videos of trance energy and just look at the amount of cameras the people bring along.... There's almost a camera per person so I would say that the laserists at work should start thinking about those cameras when they are doing their calculations. But these are just my thoughts and I don't know how those calculations are done. I'm just looking from a ethical point a view.
    Life is short.... Ride it hard!!

  7. #17
    Join Date
    Mar 2008
    Location
    Crawley (UK)
    Posts
    449

    Default

    Well you doing shows and calculations for human's eyes and not for cameras.
    I don't think that more than few cameras out of thousands get demaged (if so), so this is pretty irrelevant to what we design shows for.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •