I just upgraded to a tttconverter/flash trigger mainly because i could't get the lighting right. Just for your understanding i have a hard time evaluating my pics underwater because of my eyesight.
one of the reasons i got the D-500 was because of its focussing system.
I used uit in macro mode for about 4 days and then drifted back to manual. It was producing oke images but i was not blown away. Never tested it for wide angle .
It turned out that my problem was in the rechargeable batteries i was using. So in hindsight i would have never bought it.
Kind regards ,