F number nacalculator

These are additional lenses built-in to improve corrections even further, and therefore they give the most superior image. While they give the best image, they also are the most expensive. They are used by high end users where extreme quality of images and details are required.

Semi-plan objectives can either be built-up out of two lens element achromats or three or more element apochromats and has about 80% of focused area across the center. EPL on objectives stands for Eco Plan or economical plan and

f-number formula

Although all four objective types will correct for achromatic errors (color errors), there is no “achromatic” in the name of “semi plan”, “plan”, and “semi-APO”. The difference between the lenses is the focusing area which can be seen from the eyepieces when using the objective lenses. The difference at the low power lenses is smaller than at the higher 40/60/100x lenses.

F number naformula

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Numerical aperture

The numerical aperture of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.

A plan objective corrects better for color and spherical aberration that either the semi plan or the achromatic objective. Plan objectives have a flat field around the center of close to 100% of the image and gives flatter fields and slightly higher resolving power (details). Plan objectives are supplied to middle and high end laboratories.

Objective lenses are the optic components of microscopes that take light from the object being observed, focuses the rays and then produces the image.