- Assembly of Optics
Optical bonding and optical cementing of lenses.
Lathe centering of optics
The operating principle of autocollimators
- Chief Ray Angle (CRA)
A chief ray is the ray from an off-axis object point which passes through the center of the aperture stop of an optical system.
- Chromatic Aberrations
The dependence of the axial image position on the wavelength is called Chromatic Focal Shift.
The operating principle of collimators
- Depth of Focus
The depth of focus is the extent of the region in front of and behind the image plane in which the image will appear to be sharp.
Definition of effective focal length
- EFL and Distortion
Measurement of the effective focal length and the distortion
The F-Number of a lens is defined by the ratio between the EFL and the diameter of the entrance pupil.
- Field Curvature
Field curvature is an optical aberration in which the focus position changes from the center to the edge of the field of view.
- Measurement of Centering errors
Measurement of centering errors of spherical, aspheric lenses and objective lenses
- MTF - Modulation Transfer Function
Imaging quality evaluation with the modulation transfer function
The operating principle of telescopes
Vignetting in an optical system is the gradual reduction of the image brightness with increased off-axis angle.