Dinosaur I can relate. I recently got a Sheridan which is the .20 cal. version of the Benjamin 392. I too have tri-focals and have the same problem with sights. To get my front sight in focus, as is usually recommended, I have to lift my face from the stock. I loose my "cheek weld" and any hope of seeing the target clearly, this means the bird or squirrel "disappears" into the leafy background. If I keep my face on the stock and see the target sharply, the sight disappears or is fuzzy. Kind of like trying to precisely aim a cotton ball. One scope solution I found and really like is the one piece mount from Baker airguns. It allows a scope that is close to the eye as opposed to a "scout" mount. It allows the scope to be close to the bore axis, for good cheek/stock fit, It doesn't stress the soldered barrel joint and it is SOLID. I have limited experience with the sheridan for hunting, and none with the crossman models but IF you decide on the Benjamin check out the Baker scope mount.