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Related to focal distance: Effective focal length
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The focal distance of the concave lens was designed according to Eq.
In addition, the depth of focus increases when the focal distance moves towards infinity.
For both G2 and G3 models, the standard configuration includes three lenses (20mm, 50mm, and 100mm macro), with full calibrations for all focal distances and aperture settings supporting a wide range of measurement setups.
A motor-driven Z axis allows automatic adjustment of the focal distance to accommodate different workpieces; and a motor-driven vertical-lift front door simplifies exchanging the workpiece.
Maintaining proper focal distance as the height of the workpiece changes can be more reliable with a stationary head than with flying optics.
Camera digital single lens reflex, slr single lens, accompanied by flash, professional, objective wide angle lens, telephoto zoom lentre focal distance, and telephoto zoom lens 18-300 .
The working head featured ZnSe focalisation convex lens, with 200 mm focal distance, and 0.
8 EX DN has two glass mold aspherical lenses, including a double-sided aspherical lens, to provide excellent correction for all types of aberration, as well as an inner focusing system that corrects the fluctuation of aberration to maintain image quality regardless of the focal distance.

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