Has anyone built their own dome port? I've used an 8" dome but was looking to test a ~17" dome for split shots on my Nauticam N120 DSLR housing. I looked at purchasing a dome port of this size and the Matty SMith ones look awsome but they are $2k+ which is way out of my budget. I've read a number of posts and watched videos online but didn't find anything on this forum.

I've read the "Barry Guimbellot designs DIY small dome port for CFWA" and it looks like there might be more info on wetpixels but I didn't get my account approved before it went down so I cannot access those forums.

Edited February 27Feb 27 by brightnight

I've wondered if the BluRov hemispherical dome ports could be used to make a fisheye port. They are cheap enough and very robust.

You need to contact this man, he's located in The Netherlands. https://www.corkuyvenhoven.nl

He built this ultra megadome for over/under shots.

And that's the other guy

https://www.mattysmithphoto.com/custom-dome-ports/

Edited March 1Mar 1 by fruehaufsteher2

Do you need 17"? the 12" domes are more affordable, about $US1500 delivered assuming you'll need to pay duties on the way in.

6 hours ago, Chris Ross said:

Do you need 17"? the 12" domes are more affordable, about $US1500 delivered assuming you'll need to pay duties on the way in.

Nope, just wanted to experiment with larger domes and figured if I was going to make something I might as well go big, figured the larger I went from 8" the bigger the difference and if people are selling them there might be supplies available off the shelf to DIY, I assume they aren't getting custom molded domes. Truthfully I just want to experiment with one to see what it's like which is why I want to build one since I don't know how practical or useful it will be.

I have done my own dome ports, 4" with 3 different plexiglass curvature, I have change the plexiglass to a 8" old Sea&Sea dome port, for which I had to modify the fitting system,and a 17" dome port, which I don't have any picture right now and I lent it to a friend. When I have it again I can send you pictures, but basically is the same design of the pictures above.

I finally managed to take pictures of the big dome. My goal when i start thinking about doing it was that me and my two dive buddies can use it. At that time I had a Sea&Sea housing, and my buddies Nauticam and Subal each. So i had to make a system that can fit in 3 different housing. I first contacted to a plastic manufacturer specialized in manufacturing custom domes for security cameras and this sort of things. I told him the exact measures of what I wanted and in 3 days i had it, I can't remember exactly but the price was really inexpensive, something like 50€. After that I went to a friend who is miller turner, I explained him what I needed and he did it in aluminum, after that i sent the aluminium piece to anodize, again, this was inexpensive, about 50€. After that I assembled the dome with screws, for sealing it the miller did a groove in the edge of the aluminium where I poured polyurethane. For the fitting to the housing, I took a macro port of each housing manufacturer and again the miller turner cutted the front part and machined a male thread and a groove for an o'ring, the same thread is the female in the dome plate. Here you can see some pictures of it and the first picture that I took with this dome, but to be honest I haven't used it that much

THIS IS AWESOME!!!

On 2/27/2026 at 6:51 PM, Grantmac said:

I've wondered if the BluRov hemispherical dome ports could be used to make a fisheye port. They are cheap enough and very robust.

I didn't see this until now. Yes, they are perfect for the work. I also have a Bluerov and the dome ports are cheap, they are around 3 mm thick, I have go with the rov up to 100 meters depth with no issues. They are exactly the same that I ordered to the plastic manufacturer. If I knew about that domes before buying the bluerov I would used it.

That said, I didn't found out a big lack of definition in the corners of the image when I used the 4" dome port with the DSLR, but once I bought the FF Mirrorless this lack of definition has become a lot worst. I have ask here in the forum and to two professional underwater photographers that I am friend of, the issue is the dome diameter, 4" is to small, so now I'm using a glass 5,5" and it's not perfect but is good enough.

I'm always talking using it with the Canon 8-15 fisheye, with and with no teleconverter.

I think BluRov have a 6" hemispherical dome. That might be worth building something around.

A dome which is cheap and easy to replace would be a nice for CFWA.