What does it mean to have “Coaxial” focus controls?
Coaxial focus controls on a microscope refers to the coarse and fine focus controls being mounted on the same axes. This is a system where two knobs, one for coarse focus and one for fine focus are mounted together with the coarse focus being the larger of the two, and the smaller, fine focus knob mounted inside the coarse knob. This feature is typically found on advanced oil immersion microscopes.
