Tokina 10-17 in 10-20 S&S port? Nikon 105 vr in 105 sigma S&S port?

Hi guys, instead of buying a new camera and housing, because of the lack of money I decided to invest in new lens and staying with mi querida d70s and sea&sea housing, here is the question:

1-Now I’m using sigma 10-20 with extension-ring 40 + fisheye dome port (it works really great), can I use this combination with tokina 10-17? I know that sea&sea chart says to use sx-extension + optical dome port but have someone ever tried my suggested combination? Maybe can I change just the extension instead of the big and expensive dome?

2- for macro I’m using sigma 105 ex dg with compact macro port base + compact macro port 79, can I use it with nikon 105 macro vr? As before, the sea&sea chart says different things and suggests to use dx macro port base + dx macro port 50, the thing is that the suggested port combination for nikon 105 vr should be shorter than mine how can I know if it works?

Hope in some advice and help.

Thank you all

Alessio

Alessio,

The Fisheye dome port works great with the Tokina 10-17, I use the short extention with my Canon setup. Congrats on the new glass. You are going to love it. Sorry, I can't help with the Nikon lens question.

Have fun,

Steve

Thank you Steve for the answer, so not to expesive to buy the extension. How I'll find what to do fot the nikkor 105 vr.

Alessio