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The 300 mm f /2.8 APO was introduced in 1985 as one of the original dozen lenses released with the Maxxum/Dynax 7000. [1] Like contemporary Canon FD super-telephoto lenses, it was available exclusively with a white finish to reflect the sun, minimizing the effect of thermal expansion on optical alignment, [2] and carried a gold ring towards the front of the lens, [3]: 37 designating it as a (G ...
An apochromat, or apochromatic lens (apo), is a photographic or other lens that has better correction of chromatic and spherical aberration than the much more common achromat lenses. The prefix apo- comes from the Greek preposition ἀπό- , meaning free from or away from.
These new lenses included 35–80 mm f /4–5.6 (with built-in lens cap), 80–200 mm f /4.5–5.6, 35–105 mm f /3.5–4.5, 70–210 mm f /3.5–4.5, and 100–300 mm f /4.5–5.6. [ 4 ] Some of the original lenses were updated and re-released with the same cosmetics and are known as "New" or "Restyled" versions; minor optical updates such as ...
A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). The refracting telescope design was originally used in spyglasses and astronomical telescopes but is also used for long-focus camera lenses .
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.
The first model, named 300-800mm F5.6 EX IF APO HSM (manufacturer code 594) was announced on 4 October 2002 at that year's Photokina and first delivered on 29 January 2003. The construction of the lens has 18 optical elements in 16 groups including 2 ELD (extra-low dispersion) elements.
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One type of optical coating is an anti-reflective coating, which reduces unwanted reflections from surfaces, and is commonly used on spectacle and camera lenses. Another type is the high-reflector coating , which can be used to produce mirrors that reflect greater than 99.99% of the light that falls on them.