Underwater Photography Guide takes a look at the Nauticam 180º Viewfinder in a new review by UWPG staff member Todd Winner:
It's big and it's bright! The Nauticam 180 viewfinder gives you a much larger image of the camera's viewfinder giving you a greater advantage for critical focus and composition. The 180 viewfinder features a diopter adjustment knob that is large and easy to adjust even while wearing gloves underwater.
See the whole report here:
Underwater Photography Guide