Why the AF assist lamp is off when using X1T-S/TT685-S
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The on/off for the AF assist lamp is controlled by the camera hot shoe when using X1T-S/TT685S( HVL-F60M is included). In Sony camera series, only SLR cameras (such as a99, a77II) is able to send focal signal to camera flash and transmitter while The ILDC is not available with this feature.

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