Pentax istDL does not support TTL flash metering unlike most of the other pentax DSLRs. You need a flash that is P-TTL. How annoying hey? I was pretty bummed, but it made me learn to shoot fully manual...
i think that there is only one P-TTL flash on the market at present. (AF540 or something)
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this flash is not compatible with the d200. i had one and sent it back to sigma, they upgraded the software in the flash for free. now it works in all modes, it needs to be iTTL to work on the nikon d200 the NAd version is not iTTL.
John, there is a difference in sync times between film and digital flash. It's taken the third party manufactures a little time to catch up so there is a lot of "film" flash units out there. I'm understanding that the Sigma flash doesn't fire at all which is pretty amazing I would have thought it would fire just not at the correct time. This flash isn't a total loss because it can be used wireless with a slave unit for fill or even a main light triggered from a mini transmitter on the camera hot shoe. Here is a link to an e-Bay auction to see what I'm saying. http://cgi.ebay.ca/Wireless-Flash-Trigger-Transmitter-Receiver-4-Canon-/230537528202?pt=Camera_Flash_Accessories&hash=item35ad1b838a
I use this type of system for a location shoot, there are no wires and I can set up and balance my lighting to each set with no more dark backgrounds hope this was a help
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.