Look at this site:
http://imaging.nikon.com/lineup/sportoptics/wx/
A monster in price ($5500 == A$8000) and weight (2.5kg) for 'only' 10x50 !
The 2.5kg is more like a muscle training device while using handheld ....
But it has a FOV of 7.6 degrees, even larger than the Swarovski EL 10x50 (6.6 degrees, 66 deg AFOV) which has 'only' half the price (A$4000).
When you are a bit DIY, rather buy two 50mm f/4 finder scopes (or small 50...80mm ED scopes), two 2" Amici diagonals and two Ethos 21 hand grenades.
A bit of hobbying + A$4000 results in a bino in the range 10x50...18x80 with a comfortable 90 degree diagonal, a whopping 100 degree AFOV which outperforms these 'monsters'.....
