high magnification over 11x

This is one of the finest optical instruments i ever bought. The Image Stabilizer works so fantastic and flawless you just don't wanna let this bino out of your hand. It even works while you watch from a driving car. You can make out license plate numbers from about 400 ft away. I also bought protective lenses which I use during daytime. When stargazing I realized some mirror effects from the protective lens - so just let those off during nightime. This is the most useful and inexpensive tool for stargazing. Even better than some telescopes for the same price. The AA at 2100 mAh last for about 3-4 hrs. Even with the IS shut off the optics are awesome - but with the IS engaged it is breathtaking. It is definitely worth to spend the extra money to get this system over any other w/o IS.

I bought these binoculars (along with "The Backyard Astronomer's Guide", "Touring the Universe Through Binoculars," and Starry Night software) to learn some basic astronomy. This has turned out to be a winning combination.

While these binoculars weigh 2.6 pounds, they have a very natural, comfortable fit in the hands and are easy to handle.

The image stabilization is amazing and really improves my ability to resolve stellar objects and surface details of the moon.

It does seem a little odd that Canon did not include front lens caps. However the 15x50s are threaded for 58 mm filters, so one can easily purchase standard lens caps. I bought a pair of 58 mm Canon lens caps which fit, although the heavy rubber armor leaves minimal clearance to operate the lens cap release buttons. With filters installed the lens caps fit exactly as they would on a camera lens with plenty of clearance to remove, even if wearing gloves.

These binoculars are spectacular. Point them at Jupiter and you see a bright dot wandering around in the field of view. Press the image stabilization switch and the planet and its moons instantly become visible. While they can't subtract all movement they do get rid of the little shakes that make hand held viewing so difficult. 15x is enough magnification that Saturn is obviously not round.

A complaint about earier versions of the Canon IS line was that your finger went to sleep holding the IS switch down. Now you can press it briefly to turn on the IS circuitry which will automatically shut off in 5 minutes. If you press and hold the switch it shuts off as soon as you release it.

I haven't had my pair long enough to comment on battery life but do see a problem changing them when they are mounted on a tripod. Unlike most binoculars where the tripod mounting is at the objective end where the two barrels rotate on the Canons it is at the bottom of the binocular near the center of the tubes which don't rotate. And the battery compartment is just in front of it so you can't get to it if the binoculars are on a tripod of have a quick release plate attached.

Since the lens barrels don't rotate intra-ocular distance is adjusted by actually moving the oculars. They are kind of stiff but that is good because they stay in place once you get them set.

The tripod mount is lower than the highest part of the lens barrels so if you have a big quick release plate like that of the Manfrotto (Bogen) 410 geared head (highly recommended) it presses against the bottom of the barrels and not the flat between them.

For some reason Canon doesn't seem to fell that the objective lenses need any protection as they don't ship lens covers for them. They do provide lens covers for the oculars but they pop off a lot because the eye cups are so soft. It looks like you need something like 69mm lens caps. They don't tell you in the manual but Canon sales says they are threaded to accept 58mm filters so you can buy solar filters for them.

I can use the binoculars with my glasses on due to the 15 mm eye relief but it is really easier to use them without the glasses.

They are heavy, ~2,5#, but if you support them on the heels of your hands very stable.