So far eveything option is standard wide angle but there is also the option of the Sigma Fisheye 15mm 2.8mm with a Sigma MC-11 adapter. This uses the 4.3in Nauticam port and makes for a very compact rig and not that heavy. I use it on my A7c and have come to love the small size and quality. The port also works with the Tamaron 17-28mm f2.8 natively if shooting at smaller apetures.
