Objective Class

Field Flatness

Absolute Value(s) of Focus

Application

Achromats

up to 23 mm

between red and blue wavelength (2 colors) is ≤ 2x depth of field

for standard applications in the visual spectral range

Semi-Apochromats

up to 25 mm

for red wavelength and blue to green wavelength (3 colors) are ≤ 2.5x depth of field

for applications in the visual spectral range with higher specifications

Apochromats

up to 25 mm

for red wavelength and blue to green wavelength (3 colors) are ≤ 1x depth of field

for applications with highest specifications in the visual range and beyond