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Leica M series User Manual 15
A Step Towards Infinity
Ever since their introduction by Horatio S. Gree-
nough, stereomicroscopes have worked accord-
ing to the optical principles based primarily
on Ernst Abbe's research. For over a century,
ingenious optics designers and engineers have
worked to push magnification, resolution and
image fidelity to the limit permitted by optics.
In doing so, they have always been constrained
by the interrelation between three factors: the
higher a microscope's resolution, the lower the
available working distance. If one increases the
distance of the optical axes, the three-dimen-
sional image seen by the observer becomes
distorted— a sphere becomes an ellipse, a flat
surface curves towards the observer.