Thank you, at the moment it is more the topic of the soft corners. With the Inon i got with the A6500 for my opinion to much soft corners.
I would like to use wetlens because of the felxibility but if the others (WWL-1 and/or Fantasea UWL 09) are also so soft in the corners like the Inon i will go for a wide angle lens with a dome.
I thought the UWL-H100 is designed for compact cameras with 28mm maybe this one of the reassons of the soft corners. At my RX100 i do not noticed soft corners that much.