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Obviously, for less than the price of a somewhat-decent telescope eyepiece or a Telrad, you can’t expect perfection. The cheap BK-7 prisms vignette the aperture somewhat, and the coatings are simple (also reducing the effective aperture), making them more like a 40 mm pair. Also, the edge of the field of view isn’t the sharpest.
The field of view is also slightly narrower at 6.8 degrees, meaning the eyepieces only have a 47-degree apparent field. The eyepieces can also “rock” out of alignment for whatever reason if you press your eyes up against them, which is annoying but easily fixed.
The binoculars are also not entirely waterproof—not much of an issue for astronomy, but it may be an inconvenience if you plan on using them for other things. They do, however, have a decent rubber coating on the housing, which makes them at least water-resistant.
All the drawbacks become nonexistent when you look at how cheap this astronomical binocular is.
Lastly, there’s a chance your binoculars may be delivered out of collimation (i.e., the prisms are knocked out of alignment), which is very difficult to fix. Thankfully, Celestron will quickly and easily replace your binoculars free of charge if this is a problem.
All this being said, the Cometron 7x50s deliver about 75% of the views that a really expensive pair will, for next to nothing. I highly recommend them even if you buy another pair of binoculars since they’re so cheap that they can serve as a spare or backup.
The prisms on the Legacy WP 10x50s are BAK-4 glass, which means a sharper, brighter field compared to BK-7. They are still very slightly undersized/noncircular and vignette about 5% of the aperture, which is in effect invisible. As is stated in the name, the Legacy WP 10x50s are fully waterproof and, I think, somewhat fogging-resistant—a nice bonus. All glass surfaces in the binoculars are also fully multi-coated for maximum light transmission.
The Legacy WP 10x50s have a field of view of 6.5 degrees, and given the 10x magnification, this means the apparent field is a nice, wide 65 degrees. The eyepieces have 20 mm of eye relief if you wear glasses for astigmatism (you don’t need them otherwise) and twist-up eyecups, as well as eyepiece caps that stay attached to the neck strap.
Downsides? Well, for one, the magnification. The 10x binoculars are really the limit for handheld use, and the weight of the Legacy WP 10x50s doesn’t help with steadying them. Children and some adults will have trouble holding them steady for long periods.
If you can hold them steady, the Bushnell Legacy WP 10x50s are great binoculars for stargazing. Mine has traveled with me halfway around the globe to dark locations and is great for daytime spotting too.