1. Reminder: Please use our affiliate links for holiday shopping!

TTL with legacy lenses

Discussion in 'Accessories' started by WT21, Mar 24, 2015.

  1. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    can a cam and flash head properly ttl when the camera doesnt know the len's aperture?
     
  2. xXx1

    xXx1 TalkEmount All-Pro

    Jan 15, 2013
    Yes. Digital cameras don't even have traditional TTL but are based on preflash (automatic chimping ;) ).
     
    • Appreciate Appreciate x 1
  3. addieleman

    addieleman Passionate amateur

    Nov 13, 2012
    Netherlands
    Ad Dieleman
    Yep, works perfectly with my A7 and NEX-6, loads of legacy glass and old Minolta flashes 5600 HS-D and 3600 HS-D.
     
    • Appreciate Appreciate x 1
  4. WT21

    WT21 TalkEmount Top Veteran

    610
    Aug 7, 2011
    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
     
  5. xXx1

    xXx1 TalkEmount All-Pro

    Jan 15, 2013
    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.
     
    • Appreciate Appreciate x 1