Originally posted by msatlas I guess to clarify why I'm looking at these two in particular, price is definitely a factor. The only other options I found at a similar cost are the Tamron 10-24 and Pentax DA 14/2.8, but those seem like not as good options.
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The DA14 is a bit wider and faster than the 15 Limited which on paper is ideal. But it's also way bigger than the 15, costs $190 more, and not nearly as good optically at the same apertures.
So...figure $550 being my upper limit here.
Once more into the breach, then I'll leave the focus
on your choices,
I paid $380 for the 15mm fisheye, and its field is wider than the DA14. Distorted yes, but wider! And it can be de-fished with software when that seems best, but of course then the extra-but-distorted field edges will revert to a DA15-size field. I was seeking a DA15 and just checking on used prices when I encountered the fisheye; it wasn't what I expected to run across but it spoke to me (and my wallet) and I'm very happy with it.
Good luck with your decision, and enjoy the extra breathing room the UW lenses afford!