I have used this lens only in the studio, and it has never been submerged. It's a fantastic lens that provides a unique perspective in hard-to-reach places, much better than the first version. Additionally, with the ability to unlock the barrel, you can achieve some really impressive results. Below is the official description. Thank you for looking! Below is the official description. Thanks for looking! The Venus Optics LAOWA 24mm T14-40 Full Frame 2x PeriProbe Cine Lens captures sharp, magnified shots with full-frame camera sensors using their ARRI PL-mount and has a focal length of 24mm. Its periscope-style lens tube with interchangeable ends features an aperture range of T14 to T40 for a deep or shallow depth of field. Use it underwater or in tight spaces, thanks to its waterproof front barrel and slim profile.