Canon EF 11-24mm f/4L USM

The Ultimate Wide Angle Lens for Canon Full Frame

Zen Underwater is pleased to now support the Canon EF 11-24mm f/4L USM!  

With the first results coming in from the Canon 11-24mm f/4 underwater, we are extremely pleased with what we are seeing.  It is just as sharp, if not sharper, than the Canon 16-35mm f/2.8L II from 16-24mm with significantly less apparent purple fringing.  At 14mm, the 11-24mm is better in just about every way than the Canon 14mm f/2.8L II.  Finally, at 11mm we have nothing to compare this lens against, but it holds up surprising well!  There is definitely some noticeable corner softness, but it is surprisingly good for such a wide angle lens on full frame. Stopping the lens down a bit improves it dramatically, and the result is a stunningly wide and distortion free image. 

For sample test images, take a look here: 
http://www.nauticamusa.com/news/2015/5/29/canon-11-24-4l-usm-lens-support-testing

Zen Underwater has developed an updated DP-230 for Nauticam, DP-230-N120-1124, which has a larger port opening to accommodate the diameter of the Canon 11-24mm f/4.  It is designed to be used with the Nauticam Extension Ring 70 with Focus Knob for Canon EF 11-24mm f/4L USM (part #21271).  It also includes a user installable locking tab for the bayonet.  This locking tab is only used for Nauticam extension rings with the stainless steel locking pin.