The main difference between the PRO version and the usual one is the port for the fiber optic cable and the ability to control the aperture wheel located on the front side of the camera.
SeaFrogs 40M/130FT Underwater camera housing for Sony A9 II
Full camera control is available, except for the joystick.
Compatible lenses (standard port):
Sony FE 16-35mm F/4 ZA OSS(Autofocus only, Manualzoom gear included) - Works from 17mm to 35mm
Sony FE 24-70mm F/4 ZA OSS (No zoom available, use at 24mm only)
Sony FE 24mm F1.4 GM (Autofocus only)
Sony FE 28-70mm F3.5-5.6 OSS (Autofocus only, Manualzoom gear included)
Sony FE 50mm F1.8 (Autofocus only)
Sony FE 50mm F2.8 Macro (Autofocus only)
Sony FE 35mm F1.4 GM Lens (Autofocus only)
Sony FE 55mm F1.8 ZA Carl Zeiss Sonnar T* (Autofocus only)
Sony FE 85mm F1.8 (Autofocus only)
Compatible lenses (6" optical correct glass flat long port):
Sony FE 24-105mm F4 G OSS (Autofocus only, Manual zoom gear included)
Sony FE 16-35mm F2.8 GM (Autofocus only, Manual zoom gear included)
Sony FE 24-70 F2.8 GM (Autofocus only, Manual zoom gear not included, from 24 to 55mm, purchase here)
Sony FE 24-70 F2.8 GM II (Autofocus only, Manual zoom gear not included,purchase here)
Sigma 24-70 F2.8 DG DN II (Autofocus only, Manual zoom gear not included, purchase here)
Materials :
Polycarbonate
ABS plastic
Multi-coated optical glass
Stainless steel
EPDM rubber
Optical glass
O'ring sealed buttons with spring
Key features:
Vacuum Pump System port
High-quality optical viewfinder
Inbuilt leak detection sensor
Interchangeable port system
Synchro cable port
Dual Fiber-Optic port (Sea&Sea type)
Multi-coated optical glass standard flat port
Stainless steel mounting plate 1/4" Thread
The reinforced metallic bottom plate
In order to connect an external strobe with this housing, it will require to use of a Dual 5-Pin Sync Cord (purchase here) or a Single 5-Pin Sync Cord (purchase here), or a Fiber-optic cable (purchase here)