Please help improve this section by adding citations to reliable sources. Incorporating specialized optical materials such as synthetic fluorite, Super UD and UD glass, and large-aperture high-precision aspherical lenses, only lenses that perform to the highest photographic standards are allowed to bear the designation ‘L’.
#CANON L OBJEKTIV SERIES#
Super-telephoto lenses such as the EF 500mm f/4L IS USM, or the EF 200mm f/2L IS USM have a rear 52mm drop-in filter holder which can be used to hold gelatin type filters.Īccording to Canon, its L series lenses are Some telephoto L-lenses, such as the EF 70-200mm zoom lenses, or the EF 300mm f/4L IS USM do not have rear gelatin filter holders. Wide angle L-lenses typically have a gelatin filter holder on the mounting collar of the lens, which allows a gelatin to be installed behind the lens. Larger sized L-lenses, such as the 70–200 mm, 100–400 mm zooms, and longer focal length primes (300 mm+), usually have an off-white barrel to reduce heat absorption under the sun that may otherwise affect the performance of the lens.
All current L-series lenses have ultrasonic autofocus motors (USM) and extra communication pins, except for the specialist tilt-shift lenses which do not provide auto focus.Ī gelatin filter holder, on the rear of an EF lens. Standard prime lenses have a much greater maximum aperture, such as Canon's current 50mm and 85mm L lenses which open to f/1.2. L lenses are often "fast", with maximum apertures commonly f/2.8 or f/4, and, with the exception of the RF 100–500 mm f/4.5–7.1L IS USM lens, never exceeding f/5.6. Their front elements do not rotate for the proper operation of some filters, such as circular polarizers. L lenses also contain optics of higher quality, with many lenses containing aspherically ground, fluorite or ultra-low dispersion glass elements.
L lenses tend to be more durable, incorporating dust and water-resistant rubber seals on some models. Most L series lenses share a number of common characteristics not found in Canon's line of lower-end lenses. Some models of L lenses utilize an infrared reflective heat shield coating. This lens is often paired with an L series telephoto lens, such as the EF 28–300mm f/3.5–5.6 L USM or any of the EF 70–200mm family ( f/4L USM, f/4L IS USM, f/2.8L USM, f/2.8L IS USM, f/2.8L IS II USM).Canon L series lenses have a red ring around the lens barrel and the letter "L". In this role, it is compared with the EF-S 17–55mm lens, with which it can unofficially share lens hoods.
On a cropped sensor, it has 35 mm equivalent focal length of 27–64mm. This lens is also a popular step up from the stock kit lens on many of Canon's EOS Digital family of cameras, the EF-S 18–55mm f/3.5–5.6, for those still wanting a wide angle lens. Canon now sells an image-stabilized 16–35mm f/4 lens for about $300 more than the 17–40. A member of the L-series, the 17–40mm is a good substitute for the 16–35mm f/2.8 lens, which is heavier and costs approximately twice as much. Weighing 475 g and measuring 83.5 mm x 96.8 mm, it is a popular choice with many photographers because of its light and compact size. The 17–40mm is the least expensive of Canon's current wide-angle zooms for full-frame bodies, with the EF 16–35mm f/4L IS USM and EF 11–24mm f/4L USM being more expensive, and the EF 16–35mm f/2.8L USM being both faster and more expensive. It is one of the few Canon photo lenses that are parfocal. Other than the front element, it is sealed against dust and water, and features a diaphragm which remains nearly circular from f/4 to f/8. The lens has an EF mount to work with the EOS line of cameras. The EF 17–40mm f/4L USM lens is a wide-angle lens made by Canon Inc. ( March 2009) ( Learn how and when to remove this template message)
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