Light meter and pre-flash

edited February 7 in V6 II Suggestions
Hi, everyone,
I have a little concern with my equipment:

Pentax K-1
Pentax AF540FGZ II
2 x Cactus V6 II
Sekonic L-308X

I would measure contrast of light with my light meter, but the flash shall work in P-TTL mode and it shoots a pre-flash, which cheats the light meter. Now I have to switch my flash on "M" mode and set the power directly on its body. Is it possible to design a test mode on the V6 II, with pre-flash disabled?


  • Thank you for the suggestion. I'll discuss with our engineering team for the possibility.
    Ray Chan

    Senior Product Specialist
    Harvest One Limited
  • edited February 9
    Thank you. I've read that it is a common problem with transceivers and TTL flashes. Only some high-priced light meters are capable to ignore pre-flashes. On my L-308X if find a solution: measuring the flash with shutter speed 1/15 s, it is able to see both the pre-flash and the main flash.
  • That's brilliant.
    Ray Chan

    Senior Product Specialist
    Harvest One Limited
  • edited February 11
    That's a quick fix ))
    That works using the V6 II test button.
    Triggering via camera shutter button, on the L-308X you have to set a reading time equal to 1/8 s. Such method is appliable only in indoor shootings, where ambient light is unimportant compared to the flash.
  • Hi, everyone,
    did engineering team find a solution with these pre-flashes? Such problem makes the use of external exposimeter impossible when shooting outdoor, I should use a cheap set of triggers instead of V6 II.
  • edited May 7
    I've tried to activate flash with my camera thorugh the mirror up exposure, and effectively at the first press of the shutter the pre-flash bursts, but the main flash doesn't. Maybe it will work with rear curtain sync.

    But I'm searching for a methot to test the flash without pressing shutter, because I want to shoot with film camera also.
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