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I can and sometimes do use open sights, but my mid-forties eyes have taken care of the question "Which is best for me?" ... scopes allow anyone to shoot with more precision, especially those with weak or aging eyes.
I used to shoot my Vixen a lot with the open sight before I saved up enough to get the Vari Zone scope this fall.
I found that I was VERY (scary) accurate within 20 yards. I zeroed the open sight to shoot dead on at 20.
I tried it at ALL distances - from 15 to 50 yards.
At 15 I would shoot and aim about an inch low and it was dead on. At 20 and 25 I would shoot dead center, and at 30 I would shoot in between the bottom spike and the center dot, at 35 I would aim with the bottom spike touching my desired point of impact and so on.
I shot 100g Thunderheads with carbon express arrows and a standard dacron string. You will have to see how it shoots with the type of string and arrow weights you have. The open sight is quite good, but after you get out around 30 yards, your target center becomes more and more obscured. Most here shoot under 30 yds at their deer, as do I.