A couple of years ago I purchased my first Vortex, a 4x16, getting a terrific deal at Midway. The scope had all the features I was looking for in a varmint scope. However, I had trouble getting a clear consistent focus. Their customer service was responsive. I sent it to them, they examined it and sent it back - no defects found. When I called them and explained my difficulty they offered the following explanation:I must admit the Scope problem took a bit of the shine off my purchase and inserted some doubt into my brain .
The Vortex is the second one which I have had problems with now and I won't be buying another .
I'm sure the higher models are good but in the Diamond grade and below your taking your chances .
I'll send it back under warranty , but if its replaced or fixed it will be getting sold .
The problem was the eye box was too small for me. I'm use to Leupold and Bushnell scopes so the smaller eye box on the Vortex created problems for me to obtain consistent focus in the field. This is more of a personal issue related to me than an indictment of Vortex's quality.
Also, at 16x, the resolution wasn't great but I expected that so that wasn't a surprise or something I couldn't deal with. However, I couldn't shoot precisely due to the "small eye box" so I sold the scope. I got a Bushnell Elite and problem solved except that I didn't get a "deal" on the Bushnell and had to paid full price.