I hunt under about the same conditions. 50 yards is a very long shot for me. But I have bad eyes and they are getting worse. When younger, the open sights were fine. But the older I get the more I appreciate the scope. If you don't want to spend a lot of money, a simple 4x will do fine. If you have a little more, I would suggest a 2-7x32 Nikon Pro Staff scope. Excellent glass, and with the power range it will match all your hunting needs from quick shots to using the high power to double check what you think is that monster buck.
"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."