The 12x36 IS III have been my most used binos for over a year now, and (at least in my experience) the first experience can be quite shocking. In my case it was appalling. Terrible, really.
- The optical quality of a modern 200 $ like a Vortex Diamondback HD (but with even more CA)
- Appalling ergonomics
- Not waterproof
- Close focus is pretty poor
- Lots of doubts about battery life (and -unfounded- fear of running out of juice) and reliability
I opened a thread about it,
here. You can read it whole or, in case you are interested, here are three posts I wrote with:
My
Initial impressions
A review after
3 months of intense use
A review after
1 year of use
In my case, my advice would be to persevere. I was really tempted to send them back, but I'm glad I didn't, and it turns out the 12x36 IS III are now my go-to, unless I'm doing something really specific, where I opt for some of the other very nice binos I have. Yes, the image quality is a bit of a joke compared to any top of the range (EL, UV, let alone NL or SF which I haven't tried), or even second tier (Conquest HD, MHG), and using them takes some getting used to, but what you get is simply on another level. I recently read a forum member stating that (after using IS) he rarely uses non-IS now (I think he said something in the line that he didn't get any pleasure from them). Whenever I go from my IS III to my ELSV 8x32 is like turning on HD-Cinemascope-DolbySorround... but, I can simply see more with the Canon. Not only can I have better chances of IDing, but also get invaluable information about plumage, nuances and details of shapes, etc. Following raptors in flight is a revelation, as is watching passerines on far away branches. Really. With (handheld) non-IS I can "see" the birds, with the 12x36 IS III now I "observe" the birds in all detail. As a birdwatcher, it's simply another level.
As for case. Yes, the one that comes with them (as most accessories) is indeed lame. I find the one that came with my 8x32 EL SV is a perfect match, and really comfy to carry bandolier style across the chest.
I hope this helps. I also have the 10x30 IS II and the 8x20 IS, but I think the 12x36 IS III make the best use of the IS system, and are a stunning handheld device; so much power in your hands. As a matter of fact, a powerful 8x32 and this 12x36 IS III seem like an unbeatable combo (well, yes, you could throw in a nice 7x42-35).
EDIT: A quick note to say that if you ever do some astronomy, these are simply game changers. In case this is of any help.