Great, especially for price. Easy diy trial and error collimating. I don't know why people tear off the right grip. I just cut a little piece off the right grip for the horizontal and vertical adjustment screws with the tiny scissors on my Swiss army keychain knife. Do yourself a favour and spend $3 on a tiny long flathead screwdriver.

Vertical prism adjustment screw is under the right grip inside the center towards the front. The horizontal prism adjustment screw is just below the 0 in "15x70" marking.

Also measure the distance between the center of your pupils so you can better adjust the binocular's IDP (interpupilary distance). Just match it up to the distance between the centres of the eye holes on binoculars.

Absolutely love these binoculars! We homeschool and bough them to go with an astronomy course. THey work great. Definitely recommend a tripod for extended use because hands generally shake. They also work great for baseball games! You can see great at games and can see great detail on the moon. Good and sturdy. Came with cases and such in order to transport. We are very happy!

There are glowing reviews and terrible reviews, both i think are unfounded, so I thought I'd try and give a balanced review.

This is a great product overall. You will see spectacular views of the moon and larger deep sky objects like the Andromeda galaxy and the Orion nebula. These are a better entry to the world of astronomy than a telescope due to their portability and ease of use.

First, these binoculars are meant for astronomy.
These are heavy, and due to the 15x magnification need to be mounted on a monopod or tripod. I can't overemphasize that.
The focus is slow and stiff.

If sports, hunting, or birding is your primary use, look elsewhere at smaller, lighter binoculars.
If astronomy is you primary use, you may be able to live with these for occasional terrestrial viewing.

These binoculars are not a telescope. Sounds kind of simplistic,I know, but if you are seeking to see the bands on Jupiter or detail in Satrun's rings, these won't do that for you. But you will be able to see Jupiter's moons and the rings on Saturn - enough that you can tell what you're looking at.

The "very good":
Optically these binoculars are very good. The field is bright and flat and they focus sharp to the edges. False color (Chromatic aberration) is visible as red/blue fringing around bright objects. It is not at all severe, but it is there and visible on bright celestial and high contrast terrestrial objects. It is worse at the edges of the field than in the center. Views of large deep sky objects like the Orion nebula are really beautiful. The contrast is very good.

The "just ok"
Mechanically the focus is a little hard to adjust. There is some play in the mechanism that has to be accounted for, but it is very easy to focus out, then back in to the point of perfect focus. Once focused they stay that way for a long time.

The "totally unacceptable"
The plastic tripod adapter is totally and completely useless. The binoculars just rotate back and forth and it takes forever for them to settle down after you move them. That's a shame because at 15x magnification these need to be mounted on a sturdy tripod. Even in light wind the tripod adapter just causes the binoculars to wiggle back and forth.

I have ordered the Celestron 93524 Binocular Tripod Adapter and will see if it is good enough. Even with that adapter, the center of graviry of the binoculars won't be at the tripod's pivot point, so you have to keep the friction on and that makes it harder to move them. A better balanced tripod mounting scheme would be killer.

Summary:
An incredible value. Good optics, decent mechanics, and an unusable tripod adapter.

Celestron:
Throw a decent tripod adapter that is sturdy and fit for the purpose. Extra credit for centering the CG at the the tripod attachment point. Lose the useless strap, and raise the price

I read a lot of reviews and did a lot of research on this item and other similar items before deciding to purchase the 15x70 Celestron Skymaster Binoculars. This is not the first Celestron product I've purchased and I'm always very happy with all their products. I was able to get a few minutes of use out of these just in time for the annual Persied meteor shower. The binoculars were not as heavy as I expected and I was able to use them for brief periods (sitting in a lawn chair) without a tripod. I did not experience any colmination problems as others have reported and I suspect their problems may be due to their pupillary distance instead. I have a rather narrow pupillary distance (distance between my pupils) and this caused me to have to adjust the binoculars to an almost uncomfortable position to eliminate the double image and optical aberrations that result in improper alignment of the eyepieces with the eyes.
One other issue I had is with the left eye focus adjustment. It's not a problem with the binoculars but rather a problem with my eye sight. I normally use my binoculars and telescopes without my glasses on but I could not adjust the left eyepiece enough to correct my poor vision in that eye. I was able to put my glasses back on and adjust the rubber cups to allow for viewing with my glasses on and everything worked fine. I would also add that this is the best pair of binoculars I've ever used with my glasses. Usually, viewing binoculars with glasses is very awkward but these worked great. I'm looking forward to using these more.

p.s.- For those of you trying to decide on buying binoculars or a telescope to start a new astronomy hobby, my personal recommendation is to start with binoculars. They are quick and easy to use until you are sure you really want to invest in a good $400+ telescope. Even after I forked out $1200 for a high quality telescope, I still used my binoculars almost as often. Especially for comets and star clusters.

I own both the Celestron 15x70 and 25x70 binoculars. After comparing both here is WHAT I'VE COME UP WITH:

Both binoculars excel and have a clear crisp view. The optics are truly amazing at this price point! I did have to send back a set of the 25x70's due to interior dust being seen as I looked through them, but Amazon sent me a new pair no problem. Both binoculars use the same body. The 25x70's are a touch shorter (1/4 inch) in length due to shortening of the Ocular (eye) to the Objective lens distance. The 25x70's also have a larger Ocular lens due to the increased magnification. Both binoculars need a tripod (especially the 25x70's which are more effected by shaking). GET A 70" or greater TRIPOD! I have a 60" tripod and I'm a short5'5" but when something is near 90 degrees over your head the "60 height of the tripod won't cut it.

I posted an example of the magnification and the Field of View difference between the 15x70 (1st Pic) and the 25x70 (2nd Pic). As you can see the 25x70 gives you a greater MAGNIFICATION but the trade off is the FIELD OF VIEW which is greater with the 15x70's. The actual views through the bino's are sharper as the cellphone doesn't do it justice.

LOOKING AT OBJECTS: In looking a celestial objects the MOON totally fills the frame with the 25x70's. The 4 Galilean moons of JUPITER (yes you can seem) look great in both set of binos. Another thing I love to look at are AIRPLANES. With the use of a tripod I was able to see and follow JETS at 35,000 ft. IT IS A MARVEL! The 25x70's work well here as I can read the writing on the planes.

MY RECOMMENDATION: I would choose the 25x70's. The 25x70's are $3 more so why not go for more magnification. The wider field of view on the 15x70's does allow a better "hand-held" experience but you are still going to need a tripod for celestial viewing no matter which bino's you buy.

ALSO: Both the 25x70 and the 15x70 come with a tripod adapter but I'd upgrade to a METAL one as these binos are heavy. The Barska adapter is metal with a larger rubber tightening screw and is only $8 (see photo). I'd also get some Field Optics Research Binocular EyeShields ($14) to help keep out peripheral light in daytime viewing (see photo).