Telephoto Lens for Compact Long Range Barcode Reader

An imaging engine for decoding barcodes, the imaging engine comprising an imager and a telephoto lens assembly for long range imaging of a barcode via the imaging engine, the telephoto lens assembly including:

• a first lens, disposed along an optical axis to receive light from an object of interest;
• a second lens, disposed along the optical axis to receive light from the first lens and further to correct for pupil aberrations of the image projected after a fourth lens onto the imager;
• a third lens, disposed along the optical axis to receive light from the second lens and further to correct for chromatic aberration of the image projected after the fourth lens onto the imager, wherein the chromatic aberration is introduced by the first lens;
• and
• the fourth lens, disposed along the optical axis to receive light from the third lens and further to correct for optical field curvature of the image projected after the fourth lens onto the imager;
• wherein no elements that modify the light wavefront are disposed between any of the first lens and the second lens, the second lens and the third lens, or the third lens and the fourth lens.