An apochromatic lens.    From Wordnet, Princeton University. 

Zeiss prepares a compensating eyepiece micrometer for use with his apochromatic objectives, the divisions of which are so computed that.    From Wordnik.com.  [The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.] Reference

Threads up to about one twenty-thousandth of an inch in diameter may be sufficiently well measured by means of a Zeiss "4 centimetre apochromatic object-glass" and an eyepiece "No. 6" with sixteen centimetre tube length.    From Wordnik.com.  [On Laboratory Arts] Reference

Although with the increase in power it is correspondingly difficult to combine all these corrections in one objective, they are brought to a high pitch of excellence in the present-day "achromatic" objectives, and so remove the necessity for the use of the higher priced and less durable apochromatic lenses.    From Wordnik.com.  [The Elements of Bacteriological Technique A Laboratory Guide for Medical, Dental, and Technical Students. Second Edition Rewritten and Enlarged.] Reference

The level of color correction is specified as either achromatic or apochromatic.    From Wordnik.com.  [MAKE Magazine] Reference

You can, for example, buy semi-plan apochromatic objectives and plan achromat objectives.    From Wordnik.com.  [MAKE Magazine] Reference

apochromatic means "free of chromatic and spherical aberration" (e.g. an apochromatic lens).    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

Control of chromatic aberration is also improving, thanks to dropping prices of low - and super-low-dispersion apochromatic glass.    From Wordnik.com.  [PopPhoto: Photography Newswire] Reference

Mamiya continues to be a pioneer by continually improving and refining the finest professional photographic products with state-of-art advancements such as superior apochromatic lens technology and practical, ergonomic camera design and function.    From Wordnik.com.  [PRWeb - Daily News Feed] Reference

With the present compound Microscope, only developed in the last hundred years, and its apochromatic lenses, invented only in the last forty years, we are able to see and photograph objects of a minuteness immeasurably beyond the power of the human eye, and, with our telescopes, we can see and photograph stars far beyond the possibility of vision by the unaided eye; and yet, by the stellar spectroscope, we are actually able to examine and identify the very atoms of which that distant star is composed, or rather was composed hundreds of thousands of years ago; we can compare those atoms with the same atoms in our laboratories, and we find that, though the former are hundreds of thousands of years older than the latter, they show absolutely no signs of wear or loss of energy, though they have been for that enormous time, and are still, pulsating at the rate of not only millions but billions of times per second; and though the pulsations they emit have travelled across such a vast depth o.    From Wordnik.com.  [Science and the Infinite or Through a Window in the Blank Wall] Reference