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This means the crop factor for X system lenses (based on diagonal angle of view) compared to "full-frame" 135 is 0.79; for example, a X system lens with a focal length of 65 mm would have the equivalent coverage of a lens with a focal length of approximately 50 mm on a "full-frame" camera. X system lenses are designed by Hasselblad and ...
Photographic lens design. The design of photographic lenses for use in still or cine cameras is intended to produce a lens that yields the most acceptable rendition of the subject being photographed within a range of constraints that include cost, weight and materials. For many other optical devices such as telescopes, microscopes and ...
Modern highly corrected zoom lenses with fifteen, twenty or more elements would not be possible without multicoating. [218] [219] The transmission efficiency of a modern multicoated lens surface is about 99.7% or better. [220] Then and today, Pentax's SMC coatings were regarded as the most efficient at reducing flare and maintaining contrast. [221]
Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces that rest over the ears. Man with glasses. Glasses are typically used for vision correction ...
A collection of lenses a DSLR owner might have: 50mm F1.4, 17-40mm F4, 100mm F2.8 Macro, 24-70mm F2.8, 70-200mm F2.8. This article details lenses for single-lens reflex and digital single-lens reflex cameras (SLRs and DSLRs respectively). The emphasis is on modern lenses for 35 mm film SLRs and for "full-frame" DSLRs with sensor sizes less than ...
The template for rimless eyeglasses date back to the 1820s, when an Austrian inventor named Johann Friedrich Voigtländer [] marketed a rimless monocle. [2] The design as it is known today arose in the 1880s [3] as a means to alleviate the combined weight of metal frames with heavy glass lenses.
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