If you can't see your marks (mine are all computer generated tapes) then you probably can't see to make a shot at 20 yards or less, not to mention further out where you would have to move it. It takes me less than 4 seconds to move mine if need be. Depending on the model, it's either a slide up and down or on my Ultra a geared wheel which works very smooth. Everybody likes different things, but after using every kind of sight on the market the HHA rear adj. sights are just the ticket for the way I hunt.

Dan