mdex73 0 Posted July 16, 2013 What is the proper extension ring size for a Zen 230 dome being used on a Nauticam Mark 3 housing, using a 17-40 lens? The nauticam port chart does not list Zen domes. Share this post Link to post Share on other sites
E_viking 30 Posted July 17, 2013 On the Nikon side the 16-35mm works nicely with the 70mm. How that correlates to the Canon side is another Beer. Share this post Link to post Share on other sites
Alex_Tattersall 90 Posted July 17, 2013 (edited) 50mm is the one ! oops! Edited July 18, 2013 by Alex_Tattersall Share this post Link to post Share on other sites
twinner 5 Posted July 18, 2013 I think for the 17-40 you want a 50mm. I use a 70mm for the 16-35. Share this post Link to post Share on other sites
mdex73 0 Posted July 18, 2013 Thanks for the help, I appreciate it. Share this post Link to post Share on other sites
