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Message: <blockquote data-quote="mayoayo" data-source="post: 3357812" data-attributes="member: 16781">Hola Julian...bienvenido a Birdforum...Your question is a classic in the optics debate,..I read a similar question  a few days ago in another forum,a spanish one,and now i realiza that it was probably you¡Brands like Zen ray and vortex were mentioned in the other question...I think with an older classic,like the swaro AT 80 HD,the Kowa 823 or tsn3,or  nikon ed82,you probably would have to worry less about getting a scope that has less than perfect image quality due to aberrations like astigmatism or misalignment.Mid of the road scopes like the Zen,or even in the Vortex in the next step up in price,or pentax ED(another nice model),Are ,and this have been documented here with many personal experiences from different members,less reliable in the way they implement quality control,so you might end with a lesser unit ,if you are not ready to takethe time and effort needed to test a number of units until you find that cherry one..</blockquote>