Currently the Cinematographer Kit which includes the first ever true LOG shooting experience for a smartphone is only available on devices with Apple's A9 chips or newer due to the processor intensive nature of this feature set.
*Please note Cinematographer Kit features are only available at up to 60fps at 1080p on iOS devices containing an A10 processor or newer. All other devices that support the Cinematographer Kit are restricted to a maximum of 30fps at all resolutions.