hello .. have a d3100. one of my lenses is a 50mm f1.8 D which I must manually focus with. when doing so through the viewfinder I frame/get what is an in focus picture and it turns out to be 'out of focus'. my 60 year old eyes are obviously NOT as good as they once were but I only wear glasses for reading and not for long sight. am wondering if there's a quick adjusting fix for this problem. a way that I can best overcome this? anticipated thanks
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