consider the 10x32 EL. All the ELs, are the best Swaro has to offer. the light gathering advantage the 10x42 has over the 10x32 is very small, just a couple extra minutes at the edges of the day. but packability is an all day issue. If you need 12X, then the 12X50 won't disappoint. If you need 10X, the 32 vs 42 is really more about field of view and packability than light gathering. If you plan to mount them to a tripod, larger field of view is nice, because you have to reposition you bino fewer times. The edge to edge claritiy of the ELs is really stunning. Which lets your eyes wander across the entire field of view when tripod mounted. Personally I am always trying to lighten and shrink my pack system. Our Granite Peak tripod and Rapid Release System is evidence of this approach. The 10X32 ELs fall in line with that phlosophy.