from The Century Dictionary.
- noun One of a class of double or triple photographic lenses especially adapted for taking portraits.
Sorry, no etymologies found.
Sometimes the adjustable portrait-lens, which can be slipped over the other, will obviate that trouble by blurring everything not in exact focus, and this lens will allow you to stand nearer the object and so make it larger on the film.
College in March, 1888, with an 8-inch portrait-lens (the same used in the preparation of the Draper Catalogue) showed the old-established
The telescope used was of eight inches aperture and forty-five focus, its field of view -- owing to the "portrait-lens" or
Special conditions were required for success; above all, a wide field and a strong light-grasp, both complied with through the use of a 6-inch portrait-lens.
"In the photographs made with the 6-inch portrait-lens," Professor Barnard wrote, "besides myriads of stars, there are shown, for the first time, the vast and wonderful cloud-forms, with all their remarkable structure of lanes, holes, and black gaps, and sprays of stars.