Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A parfocal lens is a lens that stays in focus when magnification/focal length is changed. There is inevitably some amount of focus error, but small enough to be considered insignificant.Zoom lenses (sometimes referred to as "true" zoom) are ideally parfocal in that focus is maintained as the lens is zoomed (focal length and magnification changed), which not only is...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A parfocal lens is a lens that stays in focus when magnification/focal length is changed. There is inevitably some amount of focus error, but small enough to be considered insignificant.Zoom lenses (sometimes referred to as "true" zoom) are ideally parfocal in that focus is maintained as the lens is zoomed (focal length and magnification changed), which not only is convenient, but also has the advantage of allowing more accurate focusing at maximum focal length and then zooming back to a shorter focal length to compose the image. However, not all so-called "zoom" lenses are actually parfocal.
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В 2022 году издательство «НЛО» выпустило «Энциклопедию диссидентства. Восточная Европа, 1956–1989» о диссидентских движениях в странах социалистического лагеря. Настоящее издание описывает диссидентскую активность того же периода в СССР. В книгу вошли обзорные статьи по названной теме, исторические очерки, описывающие возникновение и развитие национальных диссидентских движений в ряде союзных республик,...
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Новое литературное обозрение
Дата выхода: март 2024
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