I can't focus close enough to have enough definition to use the string peep, same on rifles. I put a holographic site on my bow, pretty inexpensive, mount is available on Amazon and I'm using a $50. Holo sight it has been on a few years now. It has a cross hair and circle reticle the top of the cross hair for 20 yards, the center for 30 and the bottom for 40.
I'll post a.pic if you want.