achromatic lenses are used in all high-grade optical instruments such as telescopes and microscopes.
If not, the substitution of an achromatic lens will be of no advantage.
The achromatic condenser itself should consist of at least two combinations of different powers and of wide angular apertures.
Given the achromatic object-glass, why should not it be divided?
The bands are then achromatic in the sense that the ordinary telescope is so.
The achromatic doublets have a very large, clear and flat field.
John Dollond died; an eminent English optician and inventor of the achromatic telescope.
achromatic and other lenses were known, and the microscope, the telescope and spectacles.
This object-glass is under corrected in point of colour, and wants to be made longer in the focus to be achromatic.
Fourthly, there is the contrast of colour and neutrality, the chromatic and achromatic, or hue and shade.
achromatic ach·ro·mat·ic (āk'rə-māt'ĭk)
Of or relating to color perceived to have zero saturation and therefore no hue, such as neutral grays, white, or black.
Refracting light without spectral color separation.
Of or relating to cells or tissues difficult to stain with standard dyes.