60 mm macro and ikelite flat port

I have an Ikelite housing for my d70, I bought a nikon 60 mm macro lens, which flat port, should I go with the one with the focus knob or the one without, which one would I benifit the most.

Thanks Larry

If you ask about benefits, the one with knob will allow you to focus manually at the expense of having that knob by the front glass:

http://www.ikelite.com/web_pages/slrport.html

If you think you will want to focus manually (low light situations...) etc... go for it...

I preferred the one without the focus knob.

The 60 mm AF is pretty good, I didn't missed a shot till now because of it.

The port with the focus knob is also a little longer, its mean you'll have to be even closer to the subject to get 1:1 ratio, even with the shorter I almost touch the subject sometimes.