[LargeFormat] rest

Thu Feb 1 13:35:14 2001

                    Pam Niedermayer                                                                     
                    <pam_pine@cape.        To:     largeformat@f32.net                                  
                    com>                   cc:                                                          
                    Sent by:               Subject:     Re: [LargeFormat] rest                          
                    largeformat-adm                                                                     
                    in@f32.net                                                                          

                    02/01/01 08:53                                                                      
                    AM                                                                                  
                    Please respond                                                                      
                    to largeformat                                                                      

And keep an eye out for used Calumets. They're out there.

Pam

Clive Warren wrote:
>
> At 19:18 31/01/01 -0800, Les Newcomer 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.
> big snip
>
> Here in the UK there are a few sources of electronic kit, most of which
is
> probably available worldwide.  When looking around at what was available
a
> couple of years ago I tried to find a latching counter clock chip that
> would run fast enough to measure up to 1/1000 sec. but there were no
cheap
> varieties available.  The chip would have been the main "engine" of the
> shutter tester device. The Calumet tester worked out by far the most cost
> effective and compact option even if you value your time at zero.....
>
> Things might have changed though so perhaps it's worth looking around to
> see if you can find a cheap clock chip.
>
> All the best,
>                  Clive   http://www.f32.net

I found a plan for a shutter tester on the Internet a couple of years ago,
I built it and it works just fine. Using the tester require a little bit of
judgement for focal plane shutters, but for leaf shutters it's
straightforward. The tester plugs into the microphone input on your
computer sound card and uses a music editing program for a time base.  All
the parts are available at Radio Shack (Tandy) for just a few dollars.  The
program that I used was a trial version of CoolEdit 96 a shareware program.
The trial version was functional enough to do the shutter testing, so there
was no need to buy the program.  The current release is CoolEdit 2000, I
haven't used it but I understand that instead of limiting functionality on
the trial version it limits you to 30 minute sessions.

Here is the URL:  http://www.geocities.com/Yosemite/2131/shspeed.html

Paul _______________________________________________
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--
Pamela G. Niedermayer
Pinehill Softworks Inc.
600 W. 28th St., Suite 103
Austin, TX 78705
512-236-1677
http://www.pinehill.com

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