Canon just announce Canon RF 20-50 F4L https://www.canonrumors.com/canon-officially-announces-the-rf-20-50mm-f-4l-is-usm-pz/.

With MFD of 0.24m, do you think this lens will work with WWL-1B? Or it should work better with 140mm or 180mm dome? I'm looking for a compact rectilinear wide-angle setup for Marelux housing.

Thanks in advance for your opinion.

I'm interested in this lens for use in the 230mm (primary) and 140mm dome (travel). I wonder if it will require a closeup diopter filter to focus on the inside of the dome, or if it can focus stand-a-lone.

2 hours ago, puttsk said:

MFD of 0.24m

The 15-30 has a MFD of 0.28 and works well behind a dome so it should be good on the 180 or 230mm. No idea on the 140mm.

I'll bet its front element is too large to work well with the WWL-1B, that later of which is really designed for small front elements.

This may be a nice lens for video (behind a dome and for certain shots), or stills if it works with an wet-mate or dry-mate adapter (WACP,WWL-1, Marelux Aquista) for a solution (with limited to 28mm and greater zoom...)

I'm looking forward to seeing some real world examples underwater!

There's no lenses listed working with the WWL-C from Canon apart from the little 24-50, if EF lenses nothing at all, the 28-70/80 kit lenses are said to not work with the WWL-1B, so seems unlikely this lens would work with either of the WWL.

I expect it should do pretty well behind a 180mm dome though.