Omar Idris |
February 19th, 2009 03:06 PM |
Quote:
Originally Posted by Craig Seeman
(Post 1014633)
Omar, Sorry you feel I'm shouting.
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No worries.
Quote:
Originally Posted by Craig Seeman
(Post 1014633)
i60 is 30 frames per second (59.97 fields per second).
p30 is also 30 frames per second.
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They are both displayed at 30fps, not captured that way. One has twice the temporal resolution of the other and consequently half the exposure. It is my understanding that i60 is captured as p60, recorded as i60 and finally displayed at 30fps. If you had two cameras at the very same spot simultaneously recording a scene, one at i60 and the other at p30, every odd feild in i60 would be identical to the frames in p30 (disregarding the skipped scanlines).
Quote:
Originally Posted by Craig Seeman
(Post 1014633)
Your use of Hz is misleading.
i60 is 60 fields per second which is 30 frames per second.
1/15 is a measure in seconds. 1/15 of a second is just that. It has nothing to do with Hz.
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Anything that is measured per second has everything to do with Hertz by its very definition (1Hz = 1 cycle per second ). A 1/15th shutter-speed would be 0.067Hz.
Quote:
Originally Posted by Craig Seeman
(Post 1014633)
Shutter speed doesn't "double." It's exactly what you set it to when using fractional time (as opposed to angle).
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The suggestion was for shutter off, so no shutter speed is being set, just an equivalent. If there's no difference in illumination between shutter on at 1/60th and shutter off when in i60 mode then clearly they are one and the same thing. You get the same amount of illumination with shutter at 1/60th in i60 mode as you would with shutter off in p30 mode. If you don't beleive me try it for yourself.
Quote:
Originally Posted by Craig Seeman
(Post 1014633)
Both i60 and p30 are the same frame rate.
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Only when displayed. Even then you get a different effect from them. The two feilds of an interlaced frame do not make one progressive frame.
Quote:
Originally Posted by Craig Terott
(Post 1014638)
I'm sorry I can't answer your question about distinct frames Omar unless I unearth some of my archived Z1 video (I no longer own the Z1).
But I can clearly explain how the two cameras behave very differently:
[Z1U in 60i ,in low-light conditions, iris open, shutter on 1/60] Now, I change the shutter from 1/60 to 1/30 and the image gets noticably brighter.
[EX1 in 60i, in low-light conditions, iris open, shutter on 1/60] Turn shutter switch OFF and the image is exactly the same. No brightness increase.
My observation demonstrates that there is no change, in 60i, between 1/60 and shutter OFF.
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Was the motion you got with the Z1U smooth with a 1/30th shutter? If not then I strongly suggest SLS Frame: 2.
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