Hi All,

Looking for some advice on modifying a Zen dome.

I have a 100mm (4") Zen DP-100-N120N dome which I use for CFWA with a Nikon 10.5mm fisheye.

I'm planning to move to Micro 4/3 (OM1 Mk. II in Nautcam) and would like to bring the dome with me. Nauticam make a couple of N85 to N120 adaptors but they all seem to be too deep to use with the Olympus 8mm lens I am planning.

The base of the dome seems to be held in place with a series of allen head bolts so presumably it just unscrews.

Does anyone know if you can buy a replacement base doe the dome to convert it to a DP-100-N85 that I can use with the Nautical extension ring or is there another port adaptor out there that would work?

Appreciate the advice.

I suspect you would need to use a custom made adapter. The 10.5mm is not on the Nauticam port charts any longer, but I seem to recall it used no extension and looking at the N120N dome it appears it uses no extension either. The Port charts specify a 17mm extension for the Olympus fisheye , so it seems like there is enough room to make an adapter. This means you would need a 17mm N85-N120 adapter which is not made.

As for buying the metal only part of the n85 DP100 dome I would suggest messaging Reef photo to see if they have that as an option. This is what you would need to buy because as far as I can see the aluminium part of the N85-DP100 dome is machined from a single piece of aluminium. It might work out cheaper to pickup a second hand dome is you could find one?

An alternative might be to use a Tokina 10-17mm, you can buy a N85-N120 adapter for that to use on m43 with the Metabones speed booster. You would need the lens plus N120 zoom gear the appropriate N85-N120 adapter and possibly an extension ring to use with your dome. There are probably various options to allow you to use your dome in that setup. There are people on here using that combo including Wolfgang( @Architeuthis ). You could put up another post seeking experience with that combination and the part list if it was of interest to you.