Glass that does not go on the gun
Spotting Scopes FAQ
Angled or straight?
An angled eyepiece is easier to share between shooters of different heights and to use from a bench or on a slope. Straight is quicker for picking up a target.
Can I see bullet holes at 100 yards?
With good light and a quality scope, small holes are visible at 100 yards. Mirage and low light cut that down.