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Zoom lenses (sometimes referred to as "true" zoom) are ideally parfocal, in that focus is maintained as the lens is zoomed (i.e., focal length and magnification changed), which is convenient and has the advantage of allowing more accurate focusing at maximal focal length then zooming back to a shorter focal length to compose the image.
The optical microscope, also referred to as a light microscope, is a type of microscope that commonly uses visible light and a system of lenses to generate magnified images of small objects. Optical microscopes are the oldest design of microscope and were possibly invented in their present compound form in the 17th century.
Cone of light behind an achromatic doublet objective lens (A) without (red) and with (green) a Barlow lens optical element (B). The Barlow lens, named after Peter Barlow, is a diverging lens which, used in series with other optics in an optical system, increases the effective focal length of an optical system as perceived by all components that are after it in the system.
Two Leica oil immersion microscope objective lenses; left 100×, right 40×. The objective lens of a microscope is the one at the bottom near the sample. At its simplest, it is a very high-powered magnifying glass, with very short focal length. This is brought very close to the specimen being examined so that the light from the specimen comes ...
Archaeologists discovered 123 bodies from the 12 th century dumped in a vertical shaft near Leicester Cathedral.. The remains include men, women, and children, and show no signs of violence. The ...
This story was updated to clarify the sentencing date was put on hold earlier this month. President-elect Donald Trump's Nov. 26 sentencing date in his New York hush money case is on hold as ...
Canada women's coach Bev Priestman, suspended following a drone surveillance scandal at the Paris Olympics, was fired Tuesday following an independent review. Assistant coach Jasmine Mander and ...
As new means that the book is in the state that it should have been in when it left the publisher. This is the equivalent of mint condition in numismatics. Fine (F or FN) is "as new" but allowing for the normal effects of time on an unused book that has been protected. A fine book shows no damage. Very good (VG) describes a book that is worn ...