I just recently upgraded to the Nex 5n in the Recsea housing + ports, and have a few sets of dives under my belt now with the set up. I really like the Recsea housing (I had their Canon s90 housing as well), and they are just rock solid in terms of construction. The housing plus camera is very compact, moreso than I expected which I like since it means I can keep the same tray/handle set up I was using before.
I have the dome port for the 16mm WA+fisheye, and the 18-55MM port. Both have secure o-rings and lock firmly into place on the housing, yet can be swapped out when you change lenses fairly easily. The housing also has a screw on strobe mask with pre-drilled holes for fiber optic strobe cables.
It also has full access to the Nex 5n control wheel and buttons, flash on/off & zoom (a must on my list), so using the camera in the housing is virtually exactly the same user interface as when the camera is out of the housing.
Since the 30MM macro lens seems to have limited utility based on the reviews I read here, I've decided to wait to see if Sony or another manufacturer produces a macro lens with a longer focal length before I invest. In the meantime, I also the 67mm adapter that snaps onto the 18-55mm port so I can use my stacked macro wet lenses with it. I keep the lenses screwed into the adapter in a neoprene pouch on my BCD, so I can just quickly snap it on when diving with the 18-55 lens if I come across a good macro subject.
All in all, I'm very happy with the camera and housing. Just looking forward to getting in more dives with it, and continuing to improve!
My NEX-5N arrived a few days ago and my 10Bar housing is in transport. At this time I only have the 18-55 lens but I have purchased a FIT +5 diopter the external adapter. I have an Inon 240Z strobe connected by fiber optics. For those of you who have used the NEX-5N underwater, I would be interested in how you have set up the custom buttons and what apertures, shutter speeds, and ISOs you use as starting positions for both close-ups and distance shots. Also interested in your choice of metering and flash modes. My NEX seems to have trouble with close focusing when I use spot metering but does well when I use evaluative metering (all 49 sensors). Is this common?