[opendtv] Re: MPs back Ofcom stance on spectrum sale
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 29 May 2007 16:46:02 -0400
Craig Birkmaier wrote:
I think Mark Schubin indicated that new cameras are available now with
sensors the size of 35mm movie film frames (18mm X 24mm). That should
take a lot of cost out of the lens, and should make those cameras good
candidates for 1080p acquisition.
No, it increases the cost of the lens.
How much a lens costs is a matter of many factors (including what the
market will bear), but Bert's point, I believe, is that, for equivalent
resolutions, larger imagers require less MTF from lenses to achieve the
same overall MTF as smaller imager-lens combinations.
Here are some numbers:
Panasonic's AG-HSC1 (1080-line with spatial offset, 1/4-inch imagers) -
245 lp/mm
NHK's Super Hi-Vision II (4320-line) - 240 line pairs/mm at maximum
resolution
1/3-inch 1080-line cameras - 184 lp/mm
1/2-inch 1080-line cameras - 138 lp/mm
2/3-inch 1080-line cameras - 100 lp/mm
Red One (2540-line, 35-mm size) - 93 lp/mm
1-inch 1080-line cameras - 69 lp/mm
ARRI D20 (2200 line, 35-mm sized) - 61 lp/mm
Dalsa Origin, Evolution (2048-line, 35-mm sized) - 60 lp/mm
Vision Research Phantom HD (1080-line, 35-mm sized) - 40 lp/mm
You'll find a more-complete chart in my camera article in the May issue
of Videography magazine.
TTFN,
Mark
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