1 stop in light loss = what in %
1 stop in light loss = what in % loss from original?
if measured light equaled 100% and you stoped down the iris by 1, what is the percentage loss? thanks for the edu. jh |
50 %
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wow.
so one stop more would be half again? IE 25%of the original 100% 2 stops = 25% jh |
Yup.
Aaron |
also, keep in mind that your camera may not stop down incrementally in full stops. both the PD150 and DVX100 can be adjusted in half-stop increments. the full stop scale is:
1 - 1.4 - 2 - 2.8 - 4 - 5.6 - 8 - 11 - 16 - 22 hope this helps, kris |
why the jumps from 8-11-16-22?
jh |
The scale starts at 1 to get every second stop:
1, 2, 4, 8, 16 and 1.4 for every other: 1.4 ,2.8 ,5.6, 11.2(rounded to 11), 22 This gives double/half the light with each full stop. Cheers. |
when I'm on a set I hear the DP's and thier "people" talking "two eight" alot, figuring they mean a 2.8 stop. is this some mean value they are looking for from setup to setup for continuity?
jh |
See also this informative thread that I started:
http://www.dvinfo.net/conf/showthrea...hlight=numbers One thing that's neat and helps you remember is that every OTHER stop is twice/half that of the one that is. . .um. . .two before it. . .er What I mean is - 1, 1.4, 2, 2.8, etc. 2 is double 1, 2.8 is double 1.4, and it goes on like that. halves and thirds, I don't know if there's an easy trick to them other than just rote memory. |
THE PERFECT THREAD!
Opps, sorry for shouting. that was a good read indeed. now I understand, just don't ask me to explain it yet. jh |
My ignorance is your intellectual treasure.
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As I said in that thread, it's just square root of 2 times an f stop is the value of the next one:
1 * 1.4 = 1.4 1.4 * 1.4 = 2 2 * 1.4 = 2.8 etc etc etc (approx here of course) Aaron |
Sorry, I forgot to mention the doubling thing to get every second stop, which was kinda the point of my post...
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