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Message: <blockquote data-quote="OPTIC_NUT" data-source="post: 3287352" data-attributes="member: 121951">Easy meaning....an extra $500.The sharpness must be better for the ED50, but I'd bet that at 30x   they both exceed human acuity.  My first optics lab was on human detection   of brightness and the importance of contrast.  It's been fascinating watching   this brightness fixation for about 3 decades, especially considering the    scattering power of out-of-field Hi-Q civilian multicoatings.  A few percent   brightness at the cost of more grey level may not be worth it, but the customer  is king, and this is the age of using single numbers to decide. But the gist is...many who haven't been spoiled get much satisfaction from   spending 1/3 for 99%.  Just saying.  I don't like restricted views anyway so I'll   probably always pack a rich-field.  I sold a nice 3-element Swift spotter at the shop today,   in the Moon craze.</blockquote>