Ok so, clickbait title, yeah.. but honestly it isn't doing what it should..
I have a D5000 and I do live concert photography but when I go to use the viewfinder (I use manual focus) it LOOKS sharp and focused but I take the photo it's blurry as heck, but I notice when I move the manual wheel around it kinda has this little focus zone where it is focused but it shouldn't be because it has a fair bit of play
this doesn't absolutely bother me since when I use the live screen view and manual focus and it LOOKS focused it IS focused. So I don't know what is up with my viewfinder.. what can I/should I do? Am I missing something obvious? I usually shoot in these parameters
Aperture of f stop 1.8
50mm prime lens
auto lighting mode