+5 or +10 diopter ? with sony A6000 16-50mm kit lens ?

Inon +5 works ok. No experience with the +10. Switched to CMC now, looks promising on paper.

I have both, and have never used the +5. Get the +10.

Dustin

If possible try before you buy.

A session in a pool with a number of objects of about the size you anticipate shooting.

I agree with Oceanshutter.
I too have the +5 and +10. I only use the +10 and the 5 sits on a shelf at home. I've given up carrying it about because I never use it.

A good focus light is essential I use a Sola 1200.

I had Inon +5 and Subsee +10 for a few trips. Always use +10 because of its magnification

This lens is designed for compact cameras .... I read somewhere that it can not work with APS-C cameras.

16-50mm at 50mm will works fine with +10

I have recently purchased the Nauticam CMC-1.
This is a superb lens for your set-up if you want super macro but be warned it has a very shallow depth of field even at the smallest aperture.