Just checked the specs and ISO 50 is still an extension... be careful about using that, with previous models ISO 50 is basically overexposing and pulling the sensor values back down in firmware. Only ISO100 and higher is "passed through"...
Sensitivity
• ISO 100 - 6400
• 0.3 or 1.0 EV increments
• Auto ISO (100-3200)
• Expansion options:
ISO 50 (L1)
ISO 12800 (H1)
ISO 25600 (H2)
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