Why do I have to focus binoculars but not scopes?

[bigfutz]

Why do I have to focus most binoculars but not scopes? I see a few fixed focus binoculars out there; does anyone have experience with any of them? Seems like with every pair of binoculars I have used, I spend way too much time focusing.

 

[Midnight Raver]

Probably because it involves focusing both eyes. That is why binocs have one side with extra adjustment features for differing eye vision. Are your eyes both the same?

 

[rotarymike]

Same issue even if closing one eye. Think more depth of field - for example, a camera with a low f/stop will focus very narrowly, where at higher numbers you get greater depth of field.

 

[bigfutz]

Think someone would make fixed focus binocs.

EDIT: Duh, they do. Bushnell Permafocus.

http://www.bushnell.com/wildlife/binoculars/perma-focus