Can someone explain to me why you would pay the extra $400-$500 for the Swarovoki EL 10x42 compared to the 10x42 SLC???? Is there a difference in the optics or is it just the weight difference. There is only 3oz difference btw the EL (27oz) and SLC (30oz). I just don't see the justification for the EL price. Or should I just go up to the 10x50SLC?