American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Corrected for both chromatic and spherical aberration, as a lens.
Century Dictionary and Cyclopedia
- An epithet descriptive of an improved form of lens devised by Professor Abbe of Jena, constructed of new kinds of glass which allow of a more perfect correction of chromatic and spherical aberration than has hitherto been possible. The kinds of glass employed are chiefly remarkable in that their dispersion for different parts of the spectrum is nearly proportional; hence a lens constructed of them is not subject to the limitation of an ordinary achromatic lens of being strictly achromatic for two colors only. Another defect of ordinary lenses, that their spherical aberration is not corrected for all rays, is also largely overcome.
GNU Webster's 1913
- adj. (Optics) Free from chromatic and spherical aberration; -- said esp. of a lens in which rays of three or more colors are brought to the same focus, the degree of achromatism thus obtained being more complete than where two rays only are thus focused, as in the ordinary achromatic objective.
- adj. corrected for both chromatic and spherical aberration
“Many amateurs have discovered that the combination of a small rich field refractor, a 600 apochromatic refractor, and a 1200 Newtonian makes for the ultimate in observing equipment.”
“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.”
“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.”
“Zeiss prepares a compensating eyepiece micrometer for use with his apochromatic objectives, the divisions of which are so computed that”
“For the telescope and camera buffs out there, Legault says the images were produced using a Takahashi TOA-150 6-inch apochromatic refractor focal length 3600mm on an EM-400 mount, with a Baader Herschel wedge.”
“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.”
“Control of chromatic aberration is also improving, thanks to dropping prices of low - and super-low-dispersion apochromatic glass.”
“You can, for example, buy semi-plan apochromatic objectives and plan achromat objectives.”
“The level of color correction is specified as either achromatic or apochromatic.”
These user-created lists contain the word ‘apochromatic’.
Words taken from Infinite Jest by David Foster Wallace.
Hopefully, I'll be using this site for more than one year. It will be fun then to look back and see what new words I found worthy of notice in any given year.
All words spotted in 2008...
Looking for tweets for apochromatic.