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Re: Now you have me wondering

Posted By: Jim Wimmer (12.230.78.211)
Location: Seattle
Date: Wednesday, 23 July 2003, at 2:45 a.m.

In Response To: Now you have me wondering (David Cooke)

Think about a 2000 W*s head at full power. Many have a flash duration of 1/800 to 1/1000 second. For simplicty, use the 1/1000 second duration, and calculate the instantaneous power... that's 2 Megawatts. That's a lot of juice to excite those Xenon atoms to make light. Unfortunately, to get those electrons in there, you have to have a cathod and an anode... and they get hot, really hot from all that power and some of their atoms will ultimately go to vapor and deposit on the inside of the flash tube causing the color shift... and they can stay in vapor and interfere with excitation of the Xenon.

All this is academic, and the truth is that there are so many other factors that can make a much bigger difference that none of this should worry you... much!

And for those of you that are a bit cavalier with your packs... when your heart becomes a bit unhappy in the hospital and the nice people decide to shock you and make you jolt out of the bed... they usually start with only 200 W*s and generally move to a maximum of 400 W*s. And I'm playing with 4000 W*s... there must be something wrong with me.

Jim

A bit of my Photography

Messages In This Thread

• Color temp -vs- strobe output level
  Gabe Choy (172.194.107.55) -- Wednesday, 23 July 2003, at 1:04 a.m.
  • Link to strobe test
    Gabe Choy (172.194.107.55) -- Wednesday, 23 July 2003, at 1:09 a.m.
    • Well... Sort of...
      Jim Wimmer (12.230.78.211) -- Wednesday, 23 July 2003, at 2:06 a.m.
      • Now you have me wondering
        David Cooke (12.206.106.66) -- Wednesday, 23 July 2003, at 2:15 a.m.
        • Re: Now you have me wondering
          Jim Wimmer (12.230.78.211) -- Wednesday, 23 July 2003, at 2:45 a.m.
      • Re: Well... Sort of...
        Gabe Choy (172.196.237.80) -- Wednesday, 23 July 2003, at 3:40 a.m.
        • Re: Well... Sort of...
          Jim Wimmer (12.230.78.211) -- Thursday, 24 July 2003, at 2:54 a.m.
  • Re: Not an issue for me
    David Cooke (12.206.106.66) -- Wednesday, 23 July 2003, at 1:46 a.m.
  • Re: Color temp -vs- strobe output
    Michael and Barbara Jarboe (4.41.209.191) -- Wednesday, 23 July 2003, at 2:17 a.m.
    • U throw a lot of good info for us, but you missed.
      Gabe Choy (172.196.237.80) -- Wednesday, 23 July 2003, at 3:22 a.m.
      • Re: U throw a lot of good info for us, but you mis
        Michael and Barbara Jarboe (4.41.209.191) -- Wednesday, 23 July 2003, at 11:43 a.m.
        • getting 12% or 15% grey card?????
          Gabe Choy (216.254.59.163) -- Wednesday, 23 July 2003, at 1:07 p.m.
          • Call Pantone and Canon
            Michael and Barbara Jarboe (4.41.209.191) -- Wednesday, 23 July 2003, at 1:47 p.m.
            • "It sounds wierd". not at all, simple basic rule..
              Gabe Choy (216.254.59.163) -- Wednesday, 23 July 2003, at 2:42 p.m.
          • Percent gray doesn't matter for color balance (n)
            Rick Campbell (67.1.38.136) -- Wednesday, 23 July 2003, at 7:00 p.m.
    • You don't have problem with full size sensor.
      Gabe Choy (172.196.237.80) -- Wednesday, 23 July 2003, at 4:08 a.m.
      • Interesting, but...
        Jim Wimmer (12.230.78.211) -- Thursday, 24 July 2003, at 2:42 a.m.

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