Hello there. It seems that the Sigma EF-500

You may download a copy of the manual from here. It's for the Pentax version of the flash, but I don't see anything in it that's Pentax-specific except for the mention that's it's Pentax-specific.

I have a sigma EF 500 ST flash guns which I bought with nikon F75 some years ago. Would this flash work with canon 500d
raji

Yes, if it has a Minolta/Sony mount. The Sigma EF 500 has been producedin different mount, so that the model can fit different cameras from different producers. A Sigma flash for Sony should have SO-ADI written on it.

model no. sigmatel t99i


disply hang

Hello

Thank you for using FixYa for your problem

Always check the batteries first - make sure they have full charge (in the wrong way can discharge them) but if is it still giving the same fault, your flash is faulty.
It should be taken to an authorized repair centre for a repair estimate. Very few digital cameras have any user-serviceable parts.

Please rate our solutions and if you still have problems please call back for more ideas to help you

Thanks
Richard Scott
Technical Support
New Zealand

A: For Sigma issue:

The Sigma EF-500 flashes have very small chromed contacts for the batteries. Even though they may not look corroded, they may not power up or conduct enough power to fully cycle up. Use a polishing tip in a dremel or an ink eraser tip to clean the internal wire contacts and the flat contacts on the door. I use dielectric grease on a q-tip to apply a coat to all contacts and cleaned battery terminals to minimise future issues.

So I had fixed the problem this morning, since the warranty has expired, I opened up the flash to take a peak on the inner workings, and found that a wire had come loose, got out the soldering gun and repaired the connection and all is good.

I use one of my cams with a sigma 500 DG-ST in a nightclub

ive done 3 of the hot shoe connectors in the last year

look up sigma's website and find the contact info
give them a call and they should after some arguing ship you out the parts

every time i have ordered parts they try and get me to send it in for repair even though by the time i am ordering the parts the flashgun is already in bits & i tell them this they keep telling me how dificult it is to do...

for the canon fittment do the following

at the base of the flash remove the 4 screws
this removes the bottom section
unclip the wireing harness
there are 2 screws securing a small metal plate remove them

now there are 4 screws securing the small PCB, remove them, you can now take out the boot from the bottom be careful as the pins and the springs will want to come out
pay atention to the locking pin and how its orientated

swap over the broken boot with the replacement then retrace your steps to get it back together

send it to a sigma agent thay can replace the broken part

I've got the same problem with my new ef 500 dg super and my ef 530 dg super. It occurs on all nikon camera's I could get.
D70, D80 and Fuji S5 Pro. I don't have this problem with an old (4 years) sigma ef 500 dg super.
I will try to contact Sigma for this problem.