Sunpak does not offer dedicated (TTL) module to any digital cameras. The flash can only be used in auto mode, while the camera is set to full manual. The lens has to be stopped down according the working aperture on the flash, correct exposure will be maintained by the built-in sensor of the flash. Fire the flash using a simple hotshoe-to-PC cube if your camera doesn't sport a PC connector. Trigger voltage of the 622 is safe.
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Tocad the Sunpak distributor in the US does still distribute one of the 622 series,so you might be able to get them repaired or get spare parts. Be aware the voltages and energies available in the flash capacitors are dangerous, so you have to have electronics knowledge/skills to work on them safely. There was an ebay seller who used to sell a scanned vewrsion of the service manual for the 622.
Many flashguns deigned for film cameras - even really expensive ones - will not work with DSLRs.
I have a perfectly good pentax gun that cost me almost £300. It is fanstastic on my TOTR Pentax SLR but will only blat at maximum power on my Pentax DSLR. I had to spend another almost £300 to buy the new gun that will work with all the bells and whistles on my DSLR.
It looks as though Canon work theirs the same way.
Sunpak TR-Pak II a NiCad flash battery pack with charger and Quantam battery both has cords for 622. Personally I have taken out wire pair from removable battery pack of 622 and connected to 4 cells of Nicd type D battery pack made at home.(I placed that in my belt bag). want more details ,feel free to email at firstname.lastname@example.org
The Sunpak PZ 4000 and 5000 were made for film cameras. I have one for my EOS film cameras. It works just fine. I know this series of flashes was not made for the digital cameras. It likely will not harm your camera if the flash is designed for your camera brand. But some functions will not work. For example, do not use a flash for Minolta on a Nikon. You risk damaging your cameras electronics or frying the flash. Get their PZ 20, PZ 30, PZ40 or PZ 42X for your digital camera.
Yes and no. These old flashes were designed long before digital cameras were out. Even before AF cameras were out. With tinkering in the different modules, they were made compatible with most brands, including contact placement, voltages, etc. right up through the first 2 EOS AF film Canons. Then they redesigned them for AF film cameras and then again for the Digitals. I suggest you sell the 433 and get a Digital Sigma or Sunpak. It will not harm your camera and will have many more features.