When weight is every bit as important to me as quality, how do I choose between the Barr and Stroud Sierra
http://www.microglobe.co.uk/barr-st...lar-p-7052.html
or Opticron Oregon LE WP ?
http://www.microglobe.co.uk/opticro...rs-p-7329.html?
Both specs seem similar, though the B&S is certainly heavier, but it might be the only one with Phase Correction.
What should I look out for when handle both at this London shop shortly ?