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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. [1]
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.
Thereafter, if the optical system is indeed parfocal, then changing the focal length to lesser magnification levels will continue to yield a focused image. So ... While the current opening sentence may technically be correct, without mentioning how optimal focus is achieved, this is the reason I consider the article's opening sentence incomplete.
AFC: No. 3 Baltimore Ravens vs. No. 2 Buffalo Bills – 6:30 p.m. ET The game of the week though is the final one of the divisional round and is likely to feature this year’s NFL’s MVP winner.
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At the time of his initial arrest, Henderson told officials that Kybrel fell off the couch and onto the floor after he spun him in circles and placed him on the furniture, WPXI and WTAE reported.
Dementia is a devastating condition that impacts up to 10 percent of older adults. And while there's no cure, getting diagnosed early can help patients get on a treatment plan and families prepare ...
Markeem Benson is accused of murdering Renise Wolfe in Nevada