Great White Buffalo gets my point. All binoculars are more effective on a tripod. No matter the magnification. 15x56 are a pack glass for most people but you can hand hold them also. The point is the 12x50 els are a ONE binocular tool. The field of view is like all the smaller binos unlike looking thru straws as in the 15x56. The clarity, exit pupil, field of view, and ergonomics are without peer! You need to ask yourself if while glassing, do you spot most animals due to peripheral vision and movement (wide field of view)or not. When your glassing for bedded bucks from 10 to 2, the higher magnification of the 15s will allow you to look thru trees with more magnification and spot animals by pieces. 10s and 15s are a great combo but the 12s alone will make life simpler and your pack lighter. I just sold my 15s just to let you know my preference. 12s and 15s together doesn't make any sense to me. When I had 8.5 els and 15s, the 8.5s were used from straps while walking but always went on a tripod when given the chance.