Re: fun things to try

[P3D John Bercovitz <bercov@xxxxxxxxxxx>]

Ed Romney writes:

> 1.You can buy 1/100 sec. wristwatch digital stopwatches very cheaply, a few
> dollars. If you gated one with a CDS cell it should read slower shutter
> speeds very well. How would you do this, would you turn the power on and
> off? I'm not a solid state designer by any means. That is how a digital
> shutter tester actually  works; a CDS cell turns on and off a digital clock
> running at 1/10,000 sec.

Are CDS cells that quick?  Are there quick versions of CDS cells available?

> 2. There is a nice oscilloscope program you install in a MAC, download it
> from Utex MAC archives, turns your pooter into a scope, inputs x + y are
> the stereo mike inputs. 

Sounds interesting.  Do you have more detailed directions and the name of 
this program?

> 3. Another fun thing is a little laser like those pens lecturers use to
> point to vu-graphs and slides. Stick it in the eyepiece of your coupled RF.
> It makes two spots like the old Kalart Focus Spot but very  bright. At a
> correct infinity setting the spots are the base of the RF apart at ANY
> distance. The spots come together as one spot (or one above the other in
> split image RF's) at the distance the camera is focussed to. Best way to set
> a RF by far! Take pictures with it too. I made up one for my Speed Graphic
> Kalart RF to go in place of the old Focuspot. But don't use it on people,
> only on things. Laser light is dangerous. Surely there are many more
> interesting things to do with these little lasers. Any ideas??..

You know, I've been asked to make a 3D pointer for projected views and I'd 
been thinking about using two laser pens and changing the angle between them 
to change the depth.  Your idea for a Kalart sounds like it would work in 
this application.  I have a spare Kalart so I'll have to hook my laser pen 
to it and find out.

> 5. Kodak Stereos, I like 'em about as well as Realist, any need for a repair
> book or are they pretty obvious?

There is a book out but it's not very technical.  I personally would love to
see a technical book.  I seem to have gotten more timid in my dotage when it 
comes to tearing good equipment up and so appreciate tech books more than in
my rash youth.  8-)

John B


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