Archived posting to the Leica Users Group, 2003/02/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Howdy Yes, Quartz is more accurate but a well calibrated cap system is accurate enough +- 10% By definition, an electronic circuit is one in which amplification takes place. All other circuits are electric. The basic electronic shutter is electronic in that amplification circuits are used in an auxilliary capacity to drive the electromagnets. However, they are not central to the shutter's theory of operation. I believe the definition of electronic has been expanded to include solid state switching systems because the switches are actually amps which are kept at either zero or driven to full power withjouit being allowed to hover anywhere in between thus creating the illusion of a true switch. Thus digital systems are considered electronic through the back door With a good working knowledge of Boolean math it is ossible to make a digital computer which is purely electric, by scrounging a truckload of relays and making a timer or coupling the thing to an electric motor. Given enough complexity you could run Windows NT but real slow! See Ya Javier - --- Austin Franklin <darkroom@ix.netcom.com> 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 __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/ - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html