I have a ND30 for my Nikon D300-its about 10 years old now and have yet to have any issues with the orings-any suggestions on how often I should have this serviced with new o-rings?
I have the o-ring kit but would most likely send it to a dealer for this service as it takes time to dissemble the whole thing.
It not had that many dives on it and its stored in a cool dark place with main ring out. All controls work smoothly.
Any recommendations ?