[LargeFormat] rest

[Les Newcomer]

Wow I didn't know that about the CD. guess it's better to stick with the
calumet tester.

BTW, Andy Davidhazy, Proffessor at RIT built a shutter tester on the
same idea as the calumet tester.(photocell driving a counter that
divides a second into 1 million parts)

 I would be surpised if he didn't get the schematic from a published
source or published it himself, so if you are REALLY into do it your
self, it's an option, altho I doubt you will save much over the calumet version.



Joshua Wein wrote:
> 
> Turntables function at a "constant angular velocity"
> i.e they spin at the same speed all the time.
> Therefore the sound quality of a song early on the
> record is actually better than later, since a greater
> distance is travelled in the same time and therfore
> more vinyl passes under the needle in any given time
> interval. And as we all know it is a spiral.
> 
> CD's function at a "constant linear velocity" and
> reading begins in the middle. As the laser reads
> outwards the disc slows down so the same amount of
> plastic passes by it in any given time interval. And
> CD's are not spiral, they are concentric circles.
> 
> Hope this helps.
> 
> -Joshua Wein
> --- Les Newcomer <lnphoto@ismi.net> wrote:
> >
> >
> > Don Wilkes wrote:
> > >
> > > At 08:13 AM 1/30/01 -0500, Thomas W. Keech, Jr.
> > (Tom Keech) wrote:
> > >
> > > >In an old copy of The Amateur Photographer's
> > Handbook ( 8th edition revised
> > > >-  1973)  by Aaron Sussman, he describes a method
> > of using a turntable with
> > >
> >
> >
> > "What's a turntable? "   ;-)
> >
> > On the modern end, does anybody know what RPM a CD
> > spins at?
> >
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