It's easier to focus all the colors of light from a point on the target at a single power through a few lenses in fixed positions into a small area on the human eye retina than a variable power one with moving lenses.
All fixed lenses in single power scopes are a compromise and don't focus all colors to the same plane. It gets complicated when more lenses are added for zoom scopes. Close is good enough based on quality versus cost issues.
Greater zoom spans further compound's things.
All fixed lenses in single power scopes are a compromise and don't focus all colors to the same plane. It gets complicated when more lenses are added for zoom scopes. Close is good enough based on quality versus cost issues.
Greater zoom spans further compound's things.
