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50i vs PF25

Frame rate 50i Pf25

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#1 Gabe Phillips

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Posted 04 May 2015 - 06:12 AM

Is anyone able to explain the difference between 50i and PF25 to me? I'm new to cinematography and can't seem to get my head around it
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#2 Mark Dunn

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Posted 04 May 2015 - 06:16 AM

TV takes its time reference from the mains frequency of 50Hz. Each frame is scanned once every 1/50 sec. with the scanning lines interlaced, which is what the i stands for.

The alternative is to scan the entire frame once every 1/25sec. and then move on,  (progress) to the next frame. Hence p for progressive.


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