Question about Vivitar 283 Flash
Personally, I would not try it. While the Canon has a protection system built into the camera, the trigger voltage on the Vivitar is pretty high. I have had good results using a 283 on a slave shoe, you will have to stop down more with the extra light
Posted on Jan 08, 2008
A more appropriate product is Suntax DRF14C for Canon 10D, 30D.
Posted on Jan 21, 2009
I've got three 285HVs and have had this problem. Obviously, make sure the batteries are good and the door and inside terminals are not corroded. The whine sound that you usually hear is the high voltage circuit. the reason it changes pitch is that the main capacitor is charging. As the charge gets greater and greater, the pitch with go up as the circuit changes the power being fed to the capacitor. If you don't hear the "whine" then it's either the HV circuit isn't working (probably not) or the capacitor has gone bad. These things are sealed but can decay internally due to their structure. Usually this is due to the dielectric components breaking down or the electrolytic goo drying up (usually what causes it).
Sometimes, you can let it sit with good batteries and the switch on to see if it will eventually start to charge the cap. Most of the time tho, this is an indication that the capacitor or the charging circuit is dead. It can be repaired but sending it off will usually be more expensive than replacing the unit.
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Posted on Feb 09, 2009
According to http://www.botzilla.com/photo/strobeVolts.html the newer ones made in China or Korea are in the "Your call" range, about 5V to 10V. The older ones can go as high as 600V.
Posted on Apr 15, 2010
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