They should both fire, but they were not meant for modern digital cameras, and the auto features the the camera may have won't be able to control this flash. so it just a manual strobe, to set your camera on manual and experiment.
that little pin on the bottom as well as the 2 on the inside of the flash shoe should fire the flash.
good luck.
SOURCE: Vivitar 2800 and Canon PowerShot S5 IS
You need this: http://www.bhphotovideo.com/c/product/245292-REG/Wein_W990560_Safe_Sync_Hot_Shoe_to.html
As per: http://www.botzilla.com/photo/strobeVolts.html
- J.F. -
SOURCE: May I use a Soligor 24D Flash on my new Nikon D40X Digital Camera
You can purchase an off-camera flash sync adaptor at any good camera store, complete with extension cable. The should work fine.
SOURCE: using a vivitar 2800 flash on a nikon d60
The old series Vivitar 2800 flashgun has a very high trigger Voltage, that can damage your D60's circuitry. Even measuring the trigger voltage with a voltmeter is not a solution since you can't rely on the voltmeter to indicate the peak voltage.
SOURCE: Nikon D80. Vivitar 4600 Flash unit
That particular unit is probably not a good choice for the D80 because the trigger voltage (the electricity which flows from the flash through the camera circuits to fire the flash) is 19.5 volts, according to http://www.botzilla.com/photo/strobeVolts.html - this could possibly damage your camera electronics.
You don't have to stick with Nikon brand Speedlights, but get a modern flash which says it is I-TTL compatible for Nikon.
SOURCE: Older Vivitar Flash for new Canon SX10
Not compatible.
Get slave triggers and use them as remote flashes, or buy another film camera.
It seems Vivitar no longer is in the flash business. Get a Sigma or Sunpak digital flash for your SX10
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