[LargeFormat] rest

[Joshua Wein]

I have the calumet tester and I really like it. I have
a total of 7 leaf shutters and each one now has a
little card taped to the side with aperture
corrections on it. My 1,2,5,10,25... lenses were
remapped onto 1,2,4,8,15,30... with corrections since
that is the way my meters work. And interestingly my
180 Super mamiya 330 lens has accurate speeds except
for 1/30 which is so inconsistent from shot to shot I
realize it is unusable. So it is worth getting if you
have a lot of lenses. 

-Josh


--- Les Newcomer <lnphoto@ismi.net> wrote:
> 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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