How to use old Canon Speedlite 277T with my XTi??

[Viky]

I recently visited my in laws place, and my father in law dug out this completely unused Canon T70 Film SLR and Canon Speedlite 277T from the attic. I left the SLR behind, but took the Flash.

I've already tried it on my XTi and its almost 3times more powerful than the onboard flash, but, apart from just "flashing" the 277T, the XTi does not seem to be able to communicate with the flash regarding flash power or flash duration:(

The flash unit has a 3-point contact for the Hot Shoe, whereas the camera body has a 5-point contact, effectively leaving 2 contacts on the camera "unused".

There are controls on the back of the flash wherein you can set the ISO speed from ISO25 to ISO 400, and Aperture from f/2 to f/22. Wherein ISO 25 with aperture f/22 gives the maximum flash power and ISO 400 with aperture f/2 giving the weakest flash power.

Can anybody shed some light on how to make the best use of this unit on my XTi. Any help would be highly appreciated:)

Here are a few pics of the combo together:

[timmciglobal]

You probably don't want to do that, the trigger voltage on that flash may be much higher and unsave for the XTI.

Tim

[Viky]

You probably don't want to do that, the trigger voltage on that flash may be much higher and unsave for the XTI.

Tim

The trigger voltage of the 277T is rated at 4.8v, whereas the XTi can safely endure upto 250v... so i guess this should not be the case:rolleyes:

[timmciglobal]

XTI is 250v?

Thought it was much lower, maybe that was the original rebel?

Tim

[Viky]

Finally my problem has been solved.:)

Anybody interested in knowing the details can checkout here (http://photography-on-the.net/forum/showthread.php?t=344660)