Bests & Worsts Reviews from Amazon

I purchased the 15x70 Celestron Skymaster Binoculars primarily for casual astronomical viewing. Most of my remarks and observations center around using them for deep sky scans. First, the basic stats: Magnification: 15 power (50% greater than 10x50's) Objective size: 70mm (equivalent light gathering power twice that of a 50mm binocular) Field of view is 4.4 degrees or 230 ft. at 1000 yards A surprising near focus of a mere 43 ft.--exceptional for this type of binocular. Eye Relief: 18mm so one can wear eyeglasses--providing the rubber eyecups are folded down Exit pupil is 4.67mm (only .33mm less than 10x50's at 5mm) Other stats: Center focused; BAK-4 prisms, Porro design; Multi coated (but not fully multicoated) optics; Tripod adapter included an extra value (3 ½ inch vertical clearance). Case with strap--the latter the weakest part of the whole package. During daytime, we used it for scanning distant wildlife and mountain ridges. Excellent performance. Tripod adapter best used when viewing level or slightly above level angles. I found it too tedious and straining to attempt oblique views with a conventional photographic tripod. A tip on holding it steadier by hand: rather than grasping it the normal way, try holding each 70mm objective end with your hands. For amateur astronomers and novices wondering what you can see and its limitations, here are some notes in viewing familiar objects: Jupiter is readily resolved as a disc but seems too bright to see its bands. Its four moons can be easily seen (when in view); Saturn was near the sun but I think one may be able to resolve or infer its ring shape; Compared with a traditional 7x50 or 10x50 binocular, The Pleiades (M45), the Lagoon Nebula (M8), M35 in Gemini and the Orion Nebula (M42) are all breathtaking. So are the Scorpius open clusters M6 and M7. M13--the great Hercules Globular Cluster--was tantalizingly larger than the fuzzy spot I saw in my 10x50's. If you have a favorable southern horizon, the globular cluster M22 in Sagittarius also exhibits size. You can resolve some of the Wild Duck Cluster, M11. The shape of the Beehive open cluster (M44) in Cancer can be traced. Given a dark night, the Andromeda Galaxy (M31) almost sprawls across the entire field of view with the companion galaxy M32 glimpsed as a fuzzy smudge. Even under urban and suburban skies, M31 does show expansive width. Both the North American and Pelican Nebulae near the star Deneb at the top of Cygnus the Swan--the Northern Cross--can be detected on a dark night's viewing--with patience. The colorful double star Albireo (at the opposite end of Cygnus) can just be resolved if you can manage a steady view. Mizar & Alcor in the Big Dipper's handle are easy to separate. I found it difficult to keep the stars in the Pleiades from dancing across the view unless I used a flat surface to lean on or a tripod. In terms of field of view (4.4 degrees): You can see the entire belt of Orion in one field; you can capture the entire sword--including M42--in one field of view; The near parallelogram head of Delphinius the Dolphin fills a field; So do the Coat Hanger and Kemble Cascade asterisms, respectively; In Lyra, Vega and the stars epsilon and zeta fill a field. The latter two are revealed as double stars. So also is Castor in Gemini. The Perseus Double Cluster and nearby open cluster Stock 2 can fit in one field, but in urban or moonlit settings this is more of a challenge. The three delightful open clusters sprawling across Auriga can be seen two at a time: Either M36 and M38 or M37 and M38, respectively. One of the four keystone stars in Hercules, eta, can be positioned with the globular cluster M13 also in the same scene. As the field of view is less than five degrees, one cannot place the pointer stars in the Big Dipper in the same field nor contain the entire of the Hyades in Taurus. The central four stars in Cancer the Crab are just barely outside the field. I also own a pair of Celestron OptiView 10x50's and have found the increased magnification and light gathering power of the Skymaster 15x70 worth the price to upgrade. In a quick comparison, the increase in apparent size of Jupiter's disc in the latter is quite noticeable as is that of M13 and M31. There is a pair of stars several degrees west of M13 that appears white in the 10x50's (at least to my eyes) yet are a stunning red with the 15x70 Skymaster. The moon, of course, can be seen with greater clarity in the Skymaster yet it does not fill the entire field of view. The down sides--and no surprise here--are that I can hold the former much steadier and see more of the sky with the smaller binos. There is also some chromatic aberration with the brighter objects like Jupiter but then again, for the price point (about $60), that's part of the game. All in all, I find the Skymaster 15x70 an excellent investment for the price. I've already relegated my trusty 10x50's to backup and use the Skymaster to quickly and effectively tour the heavens on nights when I don't want to take the time to set up my 8" SCT. I'd especially recommend it as a portable alternative for those considering purchasing the typical 60mm/2.4 inch department store telescope. The caveat is that one will have greater satisfaction with the use of a tripod or other means of steadying for sustained observing of stellar objects. I suggest acquiring a different tripod adapter such as the all metal Celestron Binocular Tripod Adaptor (#93512-A or equivalent) to alleviate some of the strain of viewing because it extends the height and clearance from the tripod an additional 1 1/8 inch vertical dimension beyond that of the supplied Bakelite tripod adapter.