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Message: <blockquote data-quote="solentbirder" data-source="post: 1000062" data-attributes="member: 23216">Hi Bob,I have this binocular and I use it mostly for astronomy, although it's great in daylight too. Optical performance is very good with very little chromatic abberation. Stars focus down to tight pin-points. Even though it's a heavy instrument (about 1.5kg) it's quite well balanced and can be hand-held for short periods. The barrels are obviously quite fat to cater for the large objectives and I find this makes them very comfortable to hold (if you have large hands). For any prolonged viewing you'll need to mount them on a tripod or rest them on a bean-bag. The apparent field of view is about 60 degrees which, at 15x, provides a very impressive window. Eye-relief is very good for such a powerful binocular (stated at 16mm) and I can see the whole field with my (thin) glasses on. Considering it's a 15x58 it's a relatively compact instrument and this is certainly true compared to an equivalent porro-prism design. In terms of magnification I personally find the jump from 10x to 12x to be quite mild, but the jump to 15x is quite dramatic. Hope this is of some interest.John</blockquote>