Hello all! Kind of a noob when it comes to gear.

I might have the opportunity to test out the new 7Artisans 10mm f2.5 fisheye AF underwater, but I'm not sure if it will be compatible with my setup.

The image above is my Seafrogs Sony a6700 housing, V1 dome (23mm extension ring), and a Sigma 18-50mm. The lens is fully extended and therefore is almost the same size as the 7Artisans lens with a gap of around 2-3cm between the dome and the front element. It will fit in the housing, but I'm not sure whether the lens will work optically.

Please share your knowledge with me. Thanks!

It should focus just fine, it may vignette, depending on exactly where the lens up in the dome, but you can easily check on land before you take it underwater, just install the camera/lens and take a shot of a white sheet or similar and you will soon see if it vignettes. It probably won't be the optimum position but it will take images. The lens has 185° diagonal field so needs to protrude above the dome rim between the dome shade petals to avoid vignetting.

9 minutes ago, Chris Ross said:

It should focus just fine, it may vignette, depending on exactly where the lens up in the dome, but you can easily check on land before you take it underwater, just install the camera/lens and take a shot of a white sheet or similar and you will soon see if it vignettes. It probably won't be the optimum position but it will take images. The lens has 185° diagonal field so needs to protrude above the dome rim between the dome shade petals to avoid vignetting.

Hello Chris, thank you for the reply. Just so you know, I'm shooting with the Sony a6700 (apsc) so the field of view won't be as wide. Does that eliminate the possibility of vignetting? And are there any potential issues?