[opendtv] Re: Image quality
- From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 13 Nov 2005 19:29:49 -0500
Manfredi, Albert E wrote:
>Mark Schubin wrote:
>
>
>>Sorry. I didn't mean to be scary. Good HDTV lenses can
>>be had today for under $20,000, just a 65% premium over
>>an SD lens (to compare Canon's SD J17Ex7.7 to their HD
>>HJ17Ex7.7). Maybe they're not as great as the $112,000
>>versions, but they're good.
>>
>>
>
>Sounds like a tradeoff between super expensive lenses and
>somewhat larger image sensors, right?
>
>
Not quite, although your idea is good. The super expensive lenses went
with the larger (1-inch format, 16-mm diagonal) sensors.
>Are larger sensors out of the question because they result
>in bulkier cameras?
>
>
No. In fact, they are starting to be used. There are three cameras
with 35-mm-movie-frame-sized imagers: the ARRI D20, the Dalsa Origin,
and the Panavision Genesis. All use standard 35-mm movie-camera
lenses. The Genesis, according to a paper at SMPTE on Friday, is
currently being used in seven feature movies. Its imager is 27.5 mm in
diagonal (compare to 6 mm for the 1/3-inch camcorders or 11 mm for
2/3-inch) and has 5760 x 2160 sensors on its single imager, with
vertical color-stripe filters.
TTFN,
Mark
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