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09-27-2011, 05:06 PM   #1
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Using Sigma EF-530ST with K7?

I'm using a Sigma 530ST with my K7. I usually set the flash to TTL.
I want to try using a M 50mm 1.7 lens with the flash.
Any advice on the settings I should use on the flash, lens and K7?

Also, what is the difference between the TTL and PTTL?

09-28-2011, 07:01 AM   #2
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K7 supports pttl, not ttl (ttl requires an extra sensor in the camera and doesn't use a preflash). I believe pttl flashes don't work with M lenses because the system needs to know the aperture in order to adjust the flash power appropriately. Flashes with auto mode (AF540/Metz58/A bunch of older auto-thyristor flashes) will work and of course manual mode. There are ways of hacking up your camera to cheat the system and make the pttl flash think the lens is an A lens.

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