Decker is correct , All of my scope's apart from the one on my 22rf are 50mm and above . BUT my bino's are swarovski 7x42 and good for seeing at night with just a slither of moon, i can see rabits that are impossible to see with the naked eye.
I have a chinese scope 8x56 S&B copy and is ok for the £100 it cost and i keep it as an emergancy scope. But compaired to a 6x42 S&B or Swarovski its dark and gives a yellow picture. If fact when compaired to them it's crap.