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They sell them like that. I have a Zeiss which has two lens ganged together so you can use either of the two apart or swing them together and use both.

So true.

You really see it more with telescopes than microscopes. The eyepiece objective can come in all types of configurations Symmetrical, Plossl, Erfle, Orthoscopic, Konig, Nagler,Huygen,...

Reminds me of an old Star trek Episode where Data is stuck on a planet and he devises a microscope which is about 3 feet high and is a series of lenses probably a dozen or more stacked one above the...

Basic optics. You can't just combine objectives to get more mag. Much is involved in matching the correct lens so you get a good clear field of view with proper eye relief. That's how the first...