I use this wet lens. My very humble setup is this...
Sony A6000 in Neewer housing.
Sigma 19mm f2. 8
Meikon kit dive wet lens on 67mm flip adapter.
I'm on my 2nd wet lens. The first one, after about 100 ish dives, got what I can only describe as mould. It's semi circular in shape but it's on the inside of the flat glass, not the dome itself. Weird. I bought it off ebay so understandably Meikon didn't want to know. Bought a 2nd directly from Meikon. It hasn't done the same.
The dome gets a lot of flare. So I use it only when light is favourable, hence the flip adapter. It's cheap and I guess you get what you pay for. It good when you are very close to your subject. But I find myself using it less and less as it does affect image quality.
As an aside, I used the 16-50 kit lens at first, then saw a huge improvement when I got the Sigma.
There is some vignette but I find it mostly correctable in LR. The wet lens makes the IQ very soft in the edges.
2019 is (hopefully) the year I upgrade to FF.
Edited by Placebo365, 28 December 2018 - 12:33 AM.