The price difference between the E and the L isn’t massive – so go for the L or, if the extra bulk, weight and price of the M isn’t a deal-breaker, that’s the one I’d recommend. The best view of the bunch. ED glass and di-electric prism coating. Open-bridge design, bigger and heavier, but still reasonably light. Locking dioptre. One intermediate eye-cup position. More eye-relief than the others. Bigger focusing wheel which focuses in the opposite direction. £495.