Archived posting to the Leica Users Group, 2003/02/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Can you do TTL flash on a analog circuit that will fit into an M body? John Collier On Sunday, February 23, 2003, at 09:04 AM, Austin Franklin wrote: > Javier, > >> I think the M6,7 etc are all analog! > > The M6 is all analog, no doubt, but the M6 I'm reasonably sure they > have > some simple digital circuitry in it. At least that's how I would do > it. > > How do you time the shutter in an analog system? Somehow, you have to > measure time, to a pretty precise measure. It's a LOT easier to do by > counting clock pulses...which would mean digital. > >> It's cheaper to build a non-emulative analog circuit > > I disagree. Analog circuitry used for timing would have to be > calibrated, > and is very susceptible to drift and temperature. Digital circuits for > timing are highly reliable, and maintain the "count" over their > temperature > range with exceptional accuracy. The only downside to digital > circuitry is > it's susceptible to low temperatures. > > I will ask Leica on Monday if the M7 circuitry is all analog or has any > digital. I'd like to know. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html