Maybe you Gurus here can help me to select a high end pair of Binocs for a favorite relative . He prefers 7X to 8.5X and probably Leica or Swaro since there are plenty being advertised as " used ....like new ". All of the designations are somewhat confusing ! What's the difference between Swarobright and Swarovision ? Trinovids and Ultrvids ? HD vs. non HD for eyes not cameras ? Here's some I have seen advertised for Sale : Swaro 8x42 SLC High Definition ....7x42 Swarobright ..........8x32 EL Swarovision .........8.5x42 Swarobright .......8.5x42 Swarovision .....and for Leica : 7x35 Trinovids ...............8x42 Ultravid HD .........and it goes on and on . Lighter in weight is probably better ( although maybe not critical ) for long time viewing of Birds and Animals . He is getting up in years , and he does have big hands and wears glasses . Observation in poor light will probably never happen . Finding any of these Binocs in our Area to handle is impossible . So what do I consider , or am I just splitting hairs with these Alphas , and just go for the best condition and price ?