As several of you have recommended the Panorama that seems as good a starting point as any. Have looked at the Hawke Panorama web page http://www.hawkeoptics.co.uk/panorama-riflescopes.html and see quite a selection, but no mention of 3,9,50 AO, though there is a 3-9,40 AO. I'm guessing that would be similar? Forgive my ignorance, but what does the AO stand for?