Navitar offers a variety of telecentric lenses that produce images in which the magnification remains constant even as image distance varies. Three-dimensional images viewed through a telecentric lens are not prone to the perspective distortion and optical errors of normal lenses.
Zoom Lenses
Navitar's 12x telecentric zoom lens has adjustable focal lengths ranging from 0.16x to 1.94x magnification range. The telecentric error ranges from -0.03 to 0.05 degrees at 0.16 x magnification to -0.24 to -0.29 at 1.94x magnification.
Single-Sided Lenses
Navitar's single-sided gauging lenses include the Invarigon-R, the Macro Invaritar, ELWD Macro Invaritar and Invaritar Large Field. Invarigon-R lenses have magnifications from 0.13x to 0.50x, while the Macro Invaritar lens magnifications range from 0.5x to 5x magnification. The ELWD Macro Invaritar lenses magnify objects by 2x to 5x, and the Invaritar Large Field lenses magnify them by 0.06x to 0.63x. Distortion ranges from less than 2 percent for Invaritar Large Field lenses to less than 0.1 percent over the entire object field for the Macro Invaritar lenses.
Double-Sided Lenses
Navitar's double-sided telecentric lenses magnify objects viewed through them by 0.03 to 2.0 times, while large-format lenses offer magnifications of 0.239 to 0.478 times. The distortion on Navitar's double-sided telecentric lenses is less than 0.1 percent within the depth of field.
Video Lenses
Navitar produces two video telecentric lenses: the TC-5028 and the TEC-M55. The TC-5028 is a 55 mm F/2.8 telecentric lens that magnifies objects by 0.5x to 1.0x, with distortion ranging from less than -0.1 percent at 1.0x magnification to to less than -0.3 percent at 0.5x magnification. The TEC-M55 is a 55 mm F/2.8 lens that maintains constant perspective and magnification.
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