Lens

In optical measuring lenses are used to magnify the image of the part captured by the camera. There are many models available and the lens best suited for your application will depend on the level of accuracy required for your Quality Assurance process. You can choose between conventional zoom lenses and telecentric models depending on requirements.

Conventional lenses allow you to adjust the size of your displayed image without moving the distance to the object. In addition some lenses offer magnification in fixed steps giving you the benefit of fixed magnification throughout the measurement process and therefore an easier calibration process of the software.

The traditionally cheaper and more readily available conventional lenses can be used when large parts have to be measured or when high precision is not a factor.

Telecentric lenses have the advantage of tackling the issue of parallax, the effect where objects closer appear to be larger than objects placed farther away that is associated with the human eye and conventional zoom lenses.

This phenomenon is also present in conventional imaging systems in which the magnification of an object changes with its distance from the lens. Telecentric lenses optically correct for this occurrence so that objects remain the same perceived size independent of their distance, over a range defined by the lens.

Telecentric lenses are mostly used in the highly precise measurement of small components and wherever CCD based measurement is utilized.