Machine Vision Knowledge Base: Lens Selection and Application Guides
Knowledge
Telecentric Lens Numerical Aperture: What NA Sets | POMEAS
Numerical aperture sets light collection, the diffraction limit and, inversely, depth of field. Six checks across six POMEAS telecentric models, with figures.
Telecentric Lens Sensor Size and Image Circle | POMEAS
A telecentric lens covers a maximum sensor, not every sensor. How to match 1/2, 2/3, 1 and 1.1 inch cameras to the image circle, with published field tables.
Why a Telecentric Lens Gives a Double Image | POMEAS
A double image is rarely a lens fault. Rule out lighting, acquisition and flat glass first, then work six causes in check order, with published POMEAS specs.
Why Telecentric Measurement Drifts When Parts Move | POMEAS
Telecentricity removes magnification drift, not defocus, tilt or lighting drift. Bound each term in micrometres, then run six checks, with published values.
Moritex Machine Vision Lighting: 6 Specs to Check | POMEAS
Substituting a vision light is not a colour and size swap. Wavelength, uniformity, 24 V control, geometry and working distance decide it, with POMEAS values.
Starrett Optical Comparator Replacement: 6 Checks | POMEAS
Before replacing a Starrett optical comparator, compare stage travel, optical magnification, edge detection, accuracy and which 2D features an IMAGE 3 can measure.
Mitutoyo Optical Comparator: 6 Specs to Verify | POMEAS
A comparator reads a silhouette by eye; a camera reads pixels against a threshold. Six parameters decide whether the profile you trust survives the switch.
Keyence Measurement Microscope: 6 Specs to Check | POMEAS
A quoted accuracy is taken on one standard, at one magnification, over one area. Six parameters decide whether a substitute microscope holds your tolerance.
Olympus Microscope Alternatives: Six Checks | POMEAS
What to verify before substituting an industrial microscope when the installed base is small: six parameters and a template for the replacement specification.
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