Old Canon flash - will it fit modern cameras ?

The center pin is the pin that actually triggers the flash and all hotshoes (excluding Minolta/Sony) have a contact for it. The other contacts are for camera/flash communication (TTL). After looking around, it appears as if the 533G will behave like most old flash units when mounted on a Canon DSLR—it will work only in auto (thyristor) and manual mode. There have been reports of trouble getting the 533G to trigger on Canon's PowerShot G2.

I think it's best if you limit your liability by not suggesting that the flash will work with newer digital cameras. It's extra information that will have little effect on the final selling price, but it can potentially put you in a position of disadvantage should a dispute arise. Chances are, someone searching specifically for a 533G will have an idea of why he or she wants it.

It will fit and it might fire, might not, depending on your camera model. http://photonotes.org/blog/?p=155 If it will fire though it will be full power only and won't meter though the camera.

I tried an old A series flash on my 40D in P mode and the metering was off to say the least.

Before today's digital does all the thinking for you cameras people used to meter the flash themselves. It's not rocket science with a little practice, and many of today's top photogs use manual control on their flash anyways so that they get the effect that they were trying for. It can be done if you're willing to learn.

I'd say no. Look at the bottom of the old flash, one contact at center and one in the grove of the mount. Now look at the flash mount on a Canon SLR - probably 5 contacts. Does that tell you anything?

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