- Assembly of Optics
Optical bonding and optical cementing of lenses.
Lathe centering of optics
- Autocollimator
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.
- Collimator
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.
- EFL
Definition of effective focal length
- EFL and Distortion
Measurement of the effective focal length and the distortion
- F-number
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
- Telescope
The operating principle of telescopes
- Vignetting
Vignetting in an optical system is the gradual reduction of the image brightness with increased off-axis angle.
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KnowHow 
