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I found this for a Sunpak flash which is similar to the G4500dx:
Reading from the "auto555/G4500DX" Manual, you need to:
1. Slide the Film Selector to desired ISO - (that is the same as your camera ISO used - so, make sure you turn Off the Auto ISO feature if your camera has one).
2. Slide the Mode Selector to "A" (Auto position). This will be Auto Thyristor mode on the flash.
3. Slide the Auto F/stop Selecct Know to desired lens openning - ( so use your camera in Aperture priority mode, more in Manual to prevent changes in the camera aperture value during shooting)
Shoot, and be happy with well exposed pictures by the Auto Thyristor features of the Sunpak 555 flash.
The Sunpak 555 works great with Nikon D50, D70 cameras, as you can synchrinize flash practically at all shutter speeds. Excellent for sunny days to get narrow DOF, yet get any ambient light level contribution as desired.
For other cameras, make sure (watch out for) that Aperture Priority mode does not use shutter faster than the camera max X-sync speed - so Manual camera mode could be a better choice for a novice photographer.
In the manual there is also a list of accessories for various brand cameras, How to use Power Ratio in Manual mode, some advice on using wide lenses, how to care of your 555, and Specification section.
Minimal flash duration is 1/450 at full power, so you can safely use Auto Aperture up to 1/500 sec. Flash duration decreases with lower power setting, or lower auto mode need for poser, and the shortest flash duration is 1/17000th sec.
For something of that age, repair may not be an option due to lack of spares. May be better to replace it. Be wary of using it on digital anyway, as the high trigger voltage may fry the camera's internal electronics.
TOCAD is the USA distributor for Sunpak. go to their website and email them. Tell them what you have (the Sunpak 433AF for Nikon) give them your address, and offer to pay postage to your home. You might also check Ebay. It seems there's always someone who sold the flash last year, couldn't find the manual, but found it while looking for something else, and is now selling it on Ebay ,LOL.
Are your pictures properly exposed? Does this flash have power settings on the back? If so, move it back to full power. If your pictures are properly exposed then its doing what its supposed to. If no power setting on the back, check what ASA you have it set for. 800 or 1000 speed film requires much less light than 200 speed film. Adjust ASA based on your film.
Canon digital uses E-TTL metering for best flash results, the older Sunpak unit isn't compatible with this, so it is not fully compatible. It may work in manual mode - but won't be as good as a more modern compatible digital flash like the Canon or Metz (eg 58AF1 Canon) versions.
The Alpha 100 only supports pre-flash TTL and ADI flash control which are not supported by the Sunpak. The flash should ignite, but automatic controlling of its brightness is not possible.
For more Information about the different Minolta/Sony Flash Metering modes cf. http://www.mhohner.de/sony-minolta/flashcomp_mm.php
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