microscope. ThefocusingmechanismofthemicroscopeislargelydifferentfromthatofBHorBH2sincetheformer mustassurerobbustness,durabilityandaccuracycompatiblewithheavyaccessoriestobeattachedtoit. Therefore,thefocusingmechanismcanrarelybetroubledinpracticaluse.Afterithasbeenusedfora ...