There’s clearly enough space inside the lens—anyone want to try adapting an extender in exchange for some focusing capability? 🙂

Jokes aside, this view also pretty much confirms that adapting an extender isn’t realistically possible.

At this point, I honestly don’t see much reason to choose this lens over the EF 8–15mm f/4L.

The 8–15mm is sharp enough for me with sufficient field of view.

29 minutes ago, atus said:

Well, as we say in Spain "mi gozo en un pozo". For me, buying this lens only to produce circular images doesn't make any sense. I guess Canon is not going to do it, so to use in underwater photography we need a third party manufacturer to produce a multiplier.

I also have noticed that this lens is quiet long, so at the day is the same size that the 8-15 with the RF adaptor ring.

Like the 8-15mm, it is really just a 14mm prime with a party trick. The circular images are really fun, but I also noticed in some of the example images the ring of color cast/distortion (chromatic aberation?) at the edges which I was hoping to not be present in this new lens, is there. Plus 190 degrees may just not work on a housing.

Yes - extending would be nice to add in zoom functionality.

No IS, kinda a bummer.

I am interested in its EVU/ VR utility application and if that would work underwater for landscape experiences.

Looking forward to underwater tests, and while excited - it would need to bring some real improved gains to get rid of my 8-15mm to see if it is worthwhile.

1 hour ago, Thales said:

There’s clearly enough space inside the lens—anyone want to try adapting an extender in exchange for some focusing capability?

If you follow my link above, you'll find the sentence:

'This lens is not compatible with Canon extenders.'