Robert Ellis
Larus marinus
Which is more useful? The 10x is a handier size with a wider field, the 12x is more powerful and has the second generation stabilization, IS Mk II or such. The specifications show the 10x can correct for 1 degree of shake and the 12x for 0.8 of a degree. This will replace a grab and go scope and also be used for birding where forest and shore are on the same hike.