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Posted by Bill Vermillion on 04/15/07 03:35
In article <1176288931.432301.12250@w1g2000hsg.googlegroups.com>,
SFTVratings <SFTVratings_troy@yahoo.com> wrote:
>
>Bill Vermillion wrote:
>> SFTVratings <SFTVratings_troy@yahoo.com> wrote:
>> >> >
>> >> >> Horizontal Resolution (per picture height)
>> >> >> Standard 4:3 ratio:
>> >> >> -------------------
>> >> >> 240 - standard VHS or Betamax
>> >> >> 330 - cable tv
>> >> >> 400 - S-VHS or laserdisc
>> >> >> 500 - Extended Definition Beta.
>> >
>>
>> I could see the lines at the 500 circle, but not at the 550 line
>> circle, and it diappeared about 1/2 way between the two so I
>> interporlated it was 525.
>
>
>
>Logical. I was quoting Sony's own specs, which may be able to handle
>525 in "ideal" conditions, but they only advertised the more-
>conservative 500.
>Simiarly, I have often seen 450 lines on my Super VHS using D-VHS
>tapes, but the official JVC spec is only 400.
That's probably true. The also spec'd +/- 3 frame editing
accuracy, and about 95% of the time I got exact frame.
Having the 5-second pre-roll, and dubbing the ED-Beta to SuperBeta
on my SL-1000 was a great way to record films with commercials,
edit them with the built in editor, and have a copy that looked
like a first generation.
The only thing I saw with ED-Beta that did not match up to
digital was the typical noise that is impossible to get rid of
in any analog media - as the medium affects the message [to
paraphrase McLuhan].
And it was mainly noticeable in the blue.
It's better to under-spec and exceed them, than the reverse.
The most under-speced machine I ever worked with was
a Studer A-800 2" 24-track recorder. It far exceeded the published
specs, and I suspect it would only get to the published specs
after a few years use.
A typical 24-track 2" head-stack would have a 6000 hour head life
>>IF<< you polished it regularly. If you let it go too long you
might only get 3000-4000 hours.
The A-800 we had migrated to another studio when ours was disbanded
- and it got over 15,000 hours on the heads before they had to be
replaced.
And then there are the typical pushed specs of machines
in the home high-futilty market [to quote Don Davis]. Some
wouldn't meet specs going down hill with the wind at their back on
roller skates.
Bill
--
Bill Vermillion - bv @ wjv . com
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