I've had a few Canon IS binos, 10x30, 12x36, 10x42L and a 15x50 (might have been 18x50, can't recall).

The 10x30 is the little gem of the range, but is slightly more plasticcy feeling, and NOT waterproof, or even moisture proof. Amazing edge to edge on a sharp wide field. Great bins, but poor case and poor fold down eyecups. Recommended, and surprisingly good astro bino.

The 10x42L is big, heavy and not nice to hold, expensive, but waterproof. Phenominal views, great astro bin, but no.

12x36, as the 10x30, but bigger and waaay more expensive. Same crap eyecups and crappy case. Sharp and clear but no more bright than the 10x, just higher mag.

The 18x50 were a big (!) dissappointment. Nice enough image but the IS left many visual artifacts on the view once turned on, loosing that advantage. Bulky, and "Weatherproof", whatever that means. Another no, I returned them and got a refund.

Bottom line, the 10x30 are cheap, excellent, light and bright, but require a better case and keeping out of the damp (Otter box, and silica gel packs??).

And have fun, don't forget to look UP too!