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Re: Cineframe 30/Cineframe 25 resolution loss vs. 60i

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Re: Cineframe 30/Cineframe 25 resolution loss vs. 60i
by Steve Mullen on Dec 27, 2004 at 5:02:24 pm

"I measured 575 lines. However, I believe that it's close enough to the "margin of error" that 540 may be the actual correct number, which would be one raw field. However, that's assuming a field that's unprocessed/blended/flicker-reduced, which doesn't happen when shooting 60i."

This is the question!

Either:

1) the CCDs are switched to a mode that turns OFF row summation thereby yielding 1 field of 540-lines.

2) The camera shoots regular 50i/60i and then smart deinterlaces this to yield 810 to 540 lines which is then filtered by 70% to 575 lines. Why 70% -- turns out that is exactly the amount the DVX100 filters to get to THICK.

Looking at Sony's spec sheet on CCDs it is NOT possible to turn off ROW SUMMATION. In short, I don't think the CCD can generate a full 540 line field -- only 405 lines. That's way too low to measure 575!

DID ANYONE MEASURE CF24?


Steve Mullen
Digital Video Consulting
www.mindspring.com/~d-v-c
===
HDpartner Prime -- Real-time 1080i and 720p HDV Editing with FCP HD
GR-HD1 and JY-HD10 HDV Shooting Guide
AG-DVX100 Shooting Guide


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