I havent had a problem with my 540EZ Speedlight in 6 years but now have a strange one. I just got a Rebel XTI and the speedlight wont work on it. The flash works on all my other cameras its just the new digital. The camera's hot shoe works with my studio strobes so I am guessing it isnt the camera. Any ideas?
I had exactly the same problem with my XSi. Neither the XTi or the Xsi are compatible with this flash in TTL. It will still work in the manual settings. This flash doesn't recognize the 9 point focus points in the newer cameras. These 2 cameras will only work with the Canon 220EX, 430EX or 580EX flash units. I ended up buying the 430EX and currently have my old 540EZ for sale.
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It is not possible to use the Nikon SB-50DX directly on a Canon EOS Rebel camera. The Nikon flash gun hot shoe contacts do not match the Canon hot shoe contacts. You can use the Nikon as a slave flash gun with a PC flash cord that matches the Nikon's flash contacts then connect the end of this flash cord to a flash trigger. The Canon's flash can then trigger the Nikon flash gun via the flash trigger.
No. You require a feature called live view and your camera doesn't have it. It's technically difficult to achieve on dSLR's and it's only a couple of years ago that it started to appear on some models.
DO NOT MESS with a new camera (or any other new equipment). Take/send it back to the vendor, The purchaser has rights also. Number one it must work. I don't know your location but in UK (& Europe) we have very strict consumer legislation.
The only way to solve the problem I see is to turn the flash into non-TTL one. It can be easy done by opening four screws at the connector side of the flash, unsoldering or cutting the BROWN line and closing the connector back. The AF assist led will work.
That I did on my 200E with Canon 400D camera and all works file.
According to the Canon feature chart I have here; the 540EZ Speedlite flash is not compatible with the Digital Rebel XT in ETTL mode. The 480EG is also not compatible. The 550 or any of the others in that product line are would work.
Advance Camera Repair