* Astronomy

A monocular can make a good backup to a binocular and it is easier to carry and keep on your person. I own more binoculars than I wish to admit, but, most of the time, I carry a Nikon HG 5x15 monocular in my purse.
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BRESSER 10 x 50 Monocular
A handy waterproof rubber armoured Monocular.   
Price: £59.95

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Visionary M-10 10x50 Waterproof Monocular
Very high quality monoculars, BAK 4 prisms, multicoated lenses and full waterproofing.
Includes case, mini tripod and 10 year guarantee.

Specifications Visionary M-10 10x50 monocular.
Weight - 420g
Field m/1000 - 101
Field degrees - 5.8
min focus (m) - 2.5
Lens coating - Multi
Eye relief - 14
Eyecup type - twist
Waterproof - Yes
Guarantee - 10 years
On-Line Price:   £50.99

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Illusion 10x50 monocular
The Illusion 10x50 monocular is an excellent all round instrument. With a good field of view, tripod socket and rubber covering this monocular is a very versatile and handy piece of equipment. Supplied with a strap, case and a 1 year guarantee.
Price:    £47.96

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Ed ~ A 10x50 monocular is a light weight alternative to a pair of binoculars with very little compromise in quality or brightness of image.
The 10x magnification  and large objective is sufficient for general astronomy use.