Re: [Leica] RE: Longevity of Leica products

[Jerry Lehrer <jerryleh@pacbell.net>]

Austin

I think that now is the time for you to explain to the others what
the differences are 'tween electrical and electronic circuits; and
then explain to them differences 'tween analog and digital circuitry.

It is not for me, as an over the hill aerospace engineer, to even
attempt it.

Jerry

Austin Franklin wrote:

> Javier,
>
> > Before Quartz control, all "electronic" shutters were
> > controlled via capacitive discharge. The cap acted as
> > a delay circuit discharge time was controled by
> > modifying the discharge network either through trhe
> > introduction of new RCL elements or by varying source
> > voltage to the network. IE putting a resistor in shunt
> > with the cap would make it discharge more quickly.
>
> Of course, but this method is not near as accurate as can be done digitally.
>
> > Interestingly enough the primordial electronic shutter
> > is not truly electronic since there is no
> > amplification going on.
>
> Why do you have to have amplification to be electronic?  All electronic
> means is uses electricity!
>
> > Similarly the digitally driven
> > cameras are notb truly digital in that that there is
> > no inferencing, interpolation or the like going on
> > except for low level counters and bar segments.
>
> I don't understand what you mean.  The shutter is digitally controlled, as
> in, the timing is done with digital logic, as opposed to analog.  That makes
> it digital.  No one is saying it's entirely digital, there are almost always
> some analog components to digital control.
>
> > BTW: the old ca[pacitive electronic shutters like the
> > R3, RTS Nikkormat etc are very reliable at all
> > temperatures.
>
> I doubt they are near as accurate as one that is digitally controlled.
>
> Regards,
>
> Austin
>
> --
> To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html

- --
To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html