In the past, zoom lenses were not that common among bird watchers. But with the recent technological development with magnifying lenses on Simmons spotting scopes and other brands, the trend is now shifting. Zoom lens users can start by using low power to skim over and then increase the power for more details. A zoom eyepiece is good if you’re seeking out Winchester spotting scopes that have a broad zoom capacity.

Double knob is one of the refractor scope’s primary components. High in accuracy but weaker than the others, the single knob is the most commonly used. The double knob is offered on Alpen spotting scopes. It has two knobs with different drive ratios. Quick focusing is offered by the fast knob but when you are almost in the right focus, the slow knob may be used for even more precision.