New Cameras, Old Flashes

Beware that modern cameras usually operate with low voltages. Older flash units can put out high trigger voltages, well over 100 volts. This list from Steve's Digicams lists a number of popular flash units with their corresponding trigger voltage. Look for values under 12 volts, if you are considering mating an older flash unit with a newer, electronic shutter camera.

http://forums.steves-digicams.com/flash-external/127120-trigger-voltage.html

Here is the listing as it appears on the page for Sunpak flashes:

Sunpak flash synch voltage 
1400M DISC. 190
1600A DISC. 190
144D 6
144PC 6

266D for Canon DISC. 6
2000DZ DISC. 6
333 DISC. 6
344D DISC. 
355AF 6
433D 6
433AF 6
321 DISC. 190
322 DISC. 190
383 Super 6
411 DISC. 190 
422D DISC. 6 
444D DISC. 6 
120J Auto 12 
120J TTL 12 
DX-8R DISC. 6 
DX-12R 6 
D-Macro 6 
511 DISC. 190 
522 DISC. Early 190 Later 6 Determined only by testing
544 6 
555 6 
611 DISC. 190 
622 Auto Pro 6 
622 Super 6 
PZ4000AF 6 
PZ5000AF 6
MZ440AF 6
018ST 2
DG-60 2
DS-20 2
FP-38 3 or 6
PZ40X DISC. 6
PZ40X-II 6
MS2000 DISC. 6
MS2400 DISC. 6
MS4000 DISC. 6
MCF300 11
MCF200 11
MP150 8
MP300 8
MPP500 11
MCF300 11
MDF500 11
MDF1000 11