I have had a red dot on my S&W model 41 for 23 years. At it's lowest setting (smallest dot), it's fine. A year ago, I bought a Crosman Custom Shop pellet pistol, but the Crosman red dot I got with it was pure junk. It had only one setting..."Big red smear". Replaced it with a BSA red dot ($35.) and all is 98% (slight comma). Moral...make sure your sight has a wide range of sight adjustments. BTW, prices are higher for firearms usage because they need to handle the recoil.
Brilliant description! This is a very bright guy. The "red dot" sights were a logical outgrowth of the Telrad reflex finders which were used in astronomy. I believe the Telrads were used first. I used them on my telescopes in the early 1970's.