Sigma FP In: Cameras Posted July 11, 2019 It uses IMX410, just like Z6/S1/Zcam F6 Due to the removal of a mechanical shutter, flash sync speed is an appalling 1/30s. 1 hour ago, Mattias Burling said: Honestly, they can lock them in at iso100 for all I care. Been dreaming a long time for a base iso 50 or even 25 in a camera. The ISO 6 looks tasty even though I suspect it's a pull from 100. ISO 6 is achieved by in-camera 16-frame stacking.