viewfinder, i could not see the numbers, f-stop, shutter spd and exposure.
I understand that this eye piece stops you opening the lcd screen on the 5100 am I right?THIS LOOKS LIKE A SOLUTION FOR MY PROBLEM, I FOUND IT WHILE LOOKING AT A D600 POST IN FLICKR.
CHANGE OUT THE RECTANGULAR EYE PIECE FOR A ROUND ONE.
Convert the Nikon D600 Viewfinder into a Round Viewfinder (Works with D5100, D7000, and Others)