With the kind of hunting I do, mostly calling fox at the edge of dark AO would be useless to me as everything is happening so fast I just do not have time to try and adjust an AO, I sure for very long range shooting at PDs or paper AO is really needed,but on my 3-12x40 Meoptas that I use on my .204,.223,.22-250 up to 350-400 yds on fox its not needed.