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Oddity w/ TTL on FL-300R

Discussion in 'Lighting Forum' started by vinay, May 3, 2012.

  1. vinay

    vinay Mu-43 Regular

    137
    Mar 18, 2012
    Toronto
    I'm testing an E-P3 & FL-300R combination to get a feel for Oly RC.

    I noticed that hotshoe TTL and RC TTL don't calculate same flash output with RC FEC set to 0.00. Light output was much closer when I set set RC FEC to +3.0. Have I missed a setting somewhere, is this a peculiarity of the 300R or is this common among all Oly R strobes?

    A few notes:
    * assume flash position was unchanged for the test above
    * camera settings: manual iso, aperture priority, EC -2.0, FEC 0.00
    * camera config: EC+FEC off
     
  2. vinay

    vinay Mu-43 Regular

    137
    Mar 18, 2012
    Toronto
    I had posted the same discussion on dpreview. The conclusion from some testing was that the Oly flash controller comm signals confuse the TTL calculations when close to the subject (i.e. <4 ft). Now, my only testing was with the E-P3 & FL-300R, so not entirely sure if this affects the entire Oly RC system but there are hints that it does
     
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