YONGNUO YN585EX P-TTL Wireless Speedlite Flash Light GN58 HSS 1/12000s SP S1 S2 Slave AF-assist Rear Curtain SYNC LCD Screen for Pentax K-1 K-S1 K-S2 K-3 K-3II K-70 K-50 DSLR Camera

Compatible for Pentax wireless flashing system, can receive wireless signal from AF-360FGZ, AF540FGZ II and P's master units., Can be trigger by the camera set-top, built-in or master wireless flash, S1 & S2 pre-flash cancel mode., Three flash mode: P-TTL, M, Multi; 4 channels, effective wireless distance 20m ~ 25m indoor, 10m ~ 15m outdoor., GN58 @ISO100, 8 output levels (1/128-1/1), 29 levels of fine tuning, flash time 1/200s - 1/12000s., Support Exposure compensation, Bracket Exposure, Rear-Curtain SYNC, Red-eye Reduction, High-speed Continuous Shooting; Support Auto/Manual zooming, advanced option settings and save, AF-assist, sound prompt, angle rotation; with LCD screen.