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a7RII+Meikon Case+ST-100 Strobe

Started Jul 14, 2018 | Discussions thread
daveco2
OP daveco2 Contributing Member • Posts: 953
Re: a7RII+Meikon Case+ST-100 Strobe

The strobe doesn't fire at all on the TTL setting through the Meikon case and 5 pin cable to the A7RII.

However, with the strobe fiber optic connector attached to my Fantasea case and RX100iv, the TTL setting on the ST-100 works fine. And the exposures are good, even close up. As usual, with the RX100iv and fiberoptic connection, the strobe puts out two rapid pulses separated by 77 ms. I assume the first pulse is for exposure test and the second is for the photo.

I checked the TTL compatibility for the Sea and Sea YS-D2 and Inon Z-240 which the ST-100 seems to be modeled after and they do not list the A7RII as compatible; however, they do list the RX100iv (and a6xxx) series as TTL compatible with an optical cable. Sea and Sea also says that a converter may be needed to convert electrical to optical trigger for TTL with other than the RX100 and a6xxx types.

In conclusion, it looks like my ST-100 all works as intended, which does not include TTL with the A7RII. Also, returning the ST-100 and buying a $700 Sea and Sea or Inon would not solve the A7RII TTL compatibility problem. I suppose I could buy an a6300 and the Sea Frog case for it in order to get TTL, but I'd rather have the high cropability of the A7RII. Considering price and my frequency of use, I think I'll stick with the ST-100 and use it in manual mode. Besides, I usually shoot under ambient and do adjustment in post.

If anyone has other information, I would appreciate hearing about it.

 daveco2's gear list:daveco2's gear list
Sony RX100 Sony a7R II Sony a7R III
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