Hi, I've been using a 60mm macro with my D70s in an Ikelite housing the last several years, autofocus only. I just recently picked secondhand up the Nikon 105mm 2.8D and the corresponding Ikelite port 5508.05 (traditional-style not modular) with manual focusing knob. I'm mainly planning on using it in autofocus, as I wasn't searching specifically for the version with the knob.
I have an upcoming short diving trip, and was curious about experimenting with the focus knob, but am pretty unfamiliar with both the lens and port. I also understand there may be multiple versions of the 105mm, some with M/A or M, but mine only has M or A.
-manual focus - what should be the settings for the camera body (M or A), and lens (M or A, limit or full)
-fine-tuning autofocus - is it not possible with my lens? When I have the lens set to A, the manual focus ring is disengaged, and the knob doesn't do anything.
-switching from M to A underwater - also not possible with my lens? I think maybe this port may have come with another loose ring or sleeve originally, but I do not have it. I've seen it mentioned only in a few web pages dating to 2006 or 2007.
