Re: Scope camera mod.

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "K. C. Herrick" <kchdlh@xxxxxxx>

Now you've got me looking into it a bit...  My 7904 has the 3 
contacts in the middle of the left side of the bezel.  Checking in 
the manual, one is +15V, the 2nd is "lights common" and the 3rd, 
"camera trigger".  Camera trigger, from the scope schematic, is to be 
a step function, from the +15V inside the scope via 1 meg, to 
ground.  It's capacitively coupled in the scope & also via a series 
diode (several, in fact, along the way).  Lights common has to be the 
15 V return.

There's apparently no feature in the 7904 that turns off or blinks 
the graticule lights.  But I'll know more about how to overcome that 
when I receive the C53's manual.

Unhappily, my Canon A80 does not have a cable-release feature.  It 
will, however, provide fixed shutter durations of up to several 
seconds so I could likely make it work by dimming or turning off the 
graticule lights.

Ken.

Tesla list wrote:
> Original poster: Steve Conner <mailto:steve@xxxxxxxxxxxx><steve@xxxxxxxxxxxx>
>
>
> >  I don't see an easy way to sync the scope's one-shot with 
> > triggering the (new) camera.  There has to be a connection for 
> > triggering the scope from the C53
>
> I believe the camera ought to do two things-
>
> Arm the scope's single sweep mode automatically when you open the 
> shutter (or vice versa- open the shutter when you arm the single 
> sweep) so the film captures exactly one sweep.
>
> Turn the graticule light off while the shutter is open, apart from a 
> short blink just long enough to write the image on the film.
>
> On my R7603 there are three little contacts to the right of the 
> screen and I guess this is what they are for- ground plus each of 
> these two functions.
>
>
> If your digital camera had a cable release input (mine does) and the 
> C53 had an electromechanical shutter, it should be as easy as 
> connecting a relay coil to the shutter coil and having the relay 
> contacts trigger the camera's cable release button. The camera would 
> be set to "B" so it exposed for as long as the C53 told it to. 
> (presumably the C53 closes its shutter after the single sweep fires.)
>
>
> Steve Conner
> <http://www.scopeboy.com/>http://www.scopeboy.com/