The Duovid 8+12x42 and the 10+15x50 are the only high performance binoculars to offer a choice of two magnifications - all in one pair. If you are observing over long distances or in critical situations with little light - these binoculars consistantly deliver you brilliant Images but can also adapt to your changing situation. You can easily change from one magnification to another which is an advantage that no other no other premium binoculars offer.
So if its both overview and fine detailed observation you require - then a Duovid, with both its magnifications is your no compromise option.