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Discussion in 'Accessories' started by WT21, Mar 24, 2015.
can a cam and flash head properly ttl when the camera doesnt know the len's aperture?
Yes. Digital cameras don't even have traditional TTL but are based on preflash (automatic chimping ).
Yep, works perfectly with my A7 and NEX-6, loads of legacy glass and old Minolta flashes 5600 HS-D and 3600 HS-D.
OK, how about -- can an a7 TTL (or pre-flash chimp) with an Oly FL-600R?? I'm guessing no, but thought I'd ask
No. Camera manufacturers use proprietary protocols and signals to control flashes. I think that they aren't terribly different as third party flash manufacturers are able to make flashes.
In the old times there was a sensor that measured light reflected from film and when enough light was collected the camera told the flash to shut off. Modern sensors reflect too little light so the system is based to preflash and adjusting flash power. Third system was use of so called thyristor flashes that had similar light detection circuit than first generation TTL.