Mark Roberts wrote:
Pentax specifies 6.5V DC.
I expect you might get away with 6V as that's equivalent to four 1.5V
batteries and the ist-D certainly has a plethora of internal switching
power supply regulators that can make up a little slack, but I
wouldn't
try a 5V supply.
Many folks use 4 NiMH cells @1.2 volts each, for a total of 4.8
volts. Why wouldn't a well-regulated 5 volt supply work just as
well? My only concern would be whether or not the 1 amp current
output is sufficient, as I believe that the Pentax power supply puts
out something on the order of two amps.
If Don wants to use his HP power supply to run the camera with the
mirror up, say for sensor cleaning, I'd be especially concerned about
power draw - you don't want the mirror to suddenly flip down in the
middle of a cleaning operation. OTOH, it shouldn't hurt anything to
try it out, as the camera will simply not function if the voltage
drops below whatever cutoff the camera is set at (think depleted cells).
Regards, Jim
