Machine Vision Knowledge Base: Lens Selection and Application Guides
Knowledge
Microscope Resolution: Optical Limit Versus Camera Limit | POMEAS
On a digital microscope the achievable resolution is set by whichever is coarser: the objective or the sensor. Matching them is the whole exercise.
Microscope Depth of Field: Why Focus Survives Over a Range | POMEAS
Depth of field lets a part that is not perfectly flat stay in focus. It falls fast with magnification, and it is not the same as telecentric depth.
Microscope Working Distance: The Clearance You Actually Need | POMEAS
Working distance is not just clearance for the part. Illumination, fixturing and height variation all consume it before the objective ever focuses.
Telecentric Lens Numerical Aperture: Resolution, Depth and Light | POMEAS
NA sets resolution, depth of field and light collection at the same time. Why a low NA model is sometimes the correct engineering answer.
Confocal Sensor Resolution: Why It Depends on Range | POMEAS
A chromatic confocal sensor's resolution is not one number. Range, surface condition and averaging time all move it, and the datasheet rarely says how.
Telecentric Lens Sensor Size: Matching Format to Field and Accuracy | POMEAS
Sensor format fixes your field of view at a given magnification, and the image circle is a hard limit. How to choose the format before the model.
FA Lens Resolution: What the Figure Actually Means | POMEAS
Resolution on an FA lens datasheet can mean pixel pitch, MTF or object-space detail. Only the last one predicts what your inspection resolves.
Flash Measurement Machine: How One-Shot Measurement Works | POMEAS
A flash measurement machine captures the whole field in one exposure and measures from it. Compare FOV, accuracy and takt; see POMEAS IMAGE 3 configurations.
Why a Confocal Sensor Cannot Measure a Highly Tilted Surface | POMEAS
A chromatic confocal sensor collects light through a small aperture. Tilt sends the return spot off that aperture. How to estimate the limit.
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