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Topic: Telephoto lens

	Telephoto lens - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-08)
		In photography and cinematography, a telephoto lens is a lens where the focal length is significantly longer than the focal length of a normal lens.
		Telephoto lenses also have less depth of field than shorter lenses.
		Strictly speaking, telephoto lenses must contain a telephoto group, which allows the lens to be physically shorter than its focal length.
	encyclopedia.worldsearch.com /telephoto_lens.htm (245 words)

	Encyclopedia topic: Telephoto lens (Site not responding. Last check: 2007-10-08)
		This effect is similar to moving closer to the object, but is not the same, since a telephoto does not introduce additional perspective distortion (additional info and facts about perspective distortion).
		Telephoto lenses also have less depth of field (additional info and facts about depth of field) than shorter lenses.
		Compare with the opposite effect used in retrofocus lens (additional info and facts about retrofocus lens) es, which have greater clearance from the rear element to the film plane than their focal length would permit with a conventional optical design.
	www.absoluteastronomy.com /encyclopedia/t/te/telephoto_lens.htm (234 words)

	Photographic lens - Wikipedia, the free encyclopedia
		The lens may usually be focused by adjusting the distance from the lens assembly to the image-forming surface, or by moving elements within the lens assembly.
		The maximum usable aperture of a lens is usually specified, as the focal ratio or f-number, the focal length divided by the actual aperture in the same units.
		An extreme wideangle lens of large aperture must be of very complex construction to correct for optical aberrations, which are worse at the edge of the field and when the edge of a large lens is used for image-forming.
	en.wikipedia.org /wiki/Photographic_lens (1278 words)

	Telephoto lens - Wikipedia, the free encyclopedia
		In photography and cinematography, a telephoto lens is a lens whose focal length is significantly longer than the focal length of a normal lens.
		For a 35 mm camera with a 36 mm x 24 mm format (43.3 mm diagonal), the normal lens is 50 mm and a lens of focal length 70 mm or more is considered telephoto.
		Optical designs of telephoto lenses must contain a telephoto group, which allows the lens to be physically shorter than its focal length.
	en.wikipedia.org /wiki/Telephoto_lens (320 words)

	Telephoto Lens (Site not responding. Last check: 2007-10-08)
		In a varifocal zoom lens the focal length is varied by moving the lenses, but the camera must be refocused.
		The telephoto lens is shown mounted on a single lens reflex camera.
		In a true zoom lens, more elements are used and their positions are changed so that the image on the film remains in focus.
	hyperphysics.phy-astr.gsu.edu /hbase/geoopt/telep.html (153 words)

	E1 Lens : Digital Camera Telephoto Lens - SLR Digital Camera from Olympus Imaging America (Site not responding. Last check: 2007-10-08)
		A digital telephoto lens that's equivalent to 28-108mm 35mm film lens.
		This durable, high-performance all-digital telephoto lens possesses a fast f2.0 aperture for impressive low light shooting and multiple ED glass elements for unsurpassed image quality from edge-to-edge.
		With digital specific lens designs and unrivaled optical elements, unsurpassed image quality is achievable in an interchangeable lens SLR system, no matter what aperture you choose.
	www.olympusamerica.com /e1/sys_lens_spec.asp (243 words)

	Tamron Learning Center: Fundamentals, 35mm, Digital Lenses, Commack NY
		In contrast, in a telephoto lens, as focal lengths become longer, less difference is observed between close and distant subjects, making it appear as if they are closer regardless of the distance between them(compressed perspective).
		The Tamron lens hood is designed as an integral part of the optics to provide the maximum shading for each lens.
		This is the case even for those made for a zoom lens, where the wide-end of the focal length range inevitably becomes the benchmark for the optical design.
	www.tamron.com /lenses/fundamentals.asp (1017 words)

	Telephoto
		A good telephoto lens is an essential part of any nature photographer's kit, and learning how to use one is an important skill.
		A telephoto can be hand-held if the reciprocal of the exposure is greater than the focal length of the lens.
		For instance, if you are using a 400mm lens your shutter speed should be greater that 1/400 of a second, 1/100 of a second for a 100mm lens.
	www.marietta.edu /~mcshaffd/macro/telephoto.html (715 words)

	Telephoto lens (Site not responding. Last check: 2007-10-08)
		In photography and cinematography, a telephoto lens is a lens where the focal length is significantly longerthan the focal length of a normal lens.
		The original meaning of telephoto lens was a lens with optics containing a telephoto group, that would allowthe lens to be physically shorter than its focal length.
		Compare with the opposite effect used in retrofocus lenses, which have greater clearance from the rearelement to the film plane than their focal length would permit with a conventional optical design.
	www.therfcc.org /telephoto-lens-109710.html (166 words)

	Telephoto lens - Freepedia (Site not responding. Last check: 2007-10-08)
		For a 35 mm camera with a 36 mm x 24 mm format (43.3 mm diagonal), the normal lens is 50 mm and a lens of focal length 70 mm or more is considered telephoto.
		This effect is similar to moving closer to the object, but is not the same, since a telephoto will produce a different perspective.
		Regarding optical design a telephoto lens must contain a telephoto group, which allows the lens to be physically shorter than its focal length.
	en.freepedia.org /Telephoto.html (279 words)

	MC Rubinar 10/1000 Macro Telephoto Lens
		The lens diameter at the mounting flange is 125mm or 62.5 mm radius.
		The lens focusing is performed by rotation the focusing ring until the sharpest possible image of the object is obtained on the ground glass.
		The lens is designed for photographing at the temperature from -15°C to +45°C. when bringing the lens from the cold into a warm room, don't open its case to prevent fogging of optical details.
	www.rugift.com /photocameras/rubinar_1000_lens.htm (937 words)

	Lens
		With 35mm film, a wide angle lens is generally considered anything with a focal length of 35mm or less.
		A "normal" or "standard" lens is one that produces prints with no apparent wide angle or telephoto distortion.
		A crop of the center of a frame taken with a 14 mm lens may have the same field of view as a 100 mm portrait lens, but will have a very different (larger) depth of field and presumably a different rendering of out of focus area.
	www.photo.net /making-photographs/lens (2456 words)

	Kenko 5X Telephoto Lens (Site not responding. Last check: 2007-10-08)
		After researching what was available I discovered the Kenko 5X Telephoto Lens which seems to be the strongest one on the market for camcorders.
		In addition, one final fact is when you are on wide angle you are at 1X and when you go to full zoom on a newer camcorder that is 20X and you have increased 20X in magnification.
		Overall, if you need a telephoto lens that has more zoom than a 2X this is your best bet and seems to be the strongest available for camcorders and has a reasonable price.
	www.x-raycameras.com /kenk_5x.htm (452 words)

	Figure 1-36.—Reflecting telephoto lens
		The overall physical length of a telephoto lens is
		In the case of a telephoto (or mirror) lens, the
		A telephoto lens is used from farther away to
	www.tpub.com /content/photography/14209/css/14209_49.htm (313 words)

	Telephoto lens (Site not responding. Last check: 2007-10-08)
		In photography and cinematography, a telephoto lens is a lens where the focal length is significantly longer than the diagonal of the image projected within the camera.
		43 mm and a lens of focal length 70 mm or more is considered telephoto.
		It uses material from the wikipedia article Telephoto lens.
	www.eurofreehost.com /te/Telephoto_lens.html (169 words)

	Compact and lightweight, high-performance telephoto Zoom Lens 55-200mm F4-5.6 DC - SIGMA CORPORATION
		This compact telephoto zoom lens was exclusively designed for use with digital SLR cameras.
		High performance zoom lens is ideally suited to a wide range of subjects.
		This lens has a minimum focusing distance of 110cm (43.3in.) and maximum magnification of 1:4.5.High performance 3.6x telephoto zoom lens suited a wide range of shooting conditions, such as portrait, sports, nature.
	www.sigma-photo.co.jp /english/lens/digital/55_200_4_56.htm (329 words)

	Tamron Lenses: AF70-300MM F/4-5.6, 35mm, Digital Lenses, Commack NY (Site not responding. Last check: 2007-10-08)
		This is the definitive lightweight, compact telephoto macro zoom with a maximum magnification ratio of 1:2 at the 300mm setting -- ideal for shooting subjects that are difficult to approach such as sporting and theatrical events.
		The lens also features special effects such as the capability to provide beautifully blurred backgrounds to highlight the main subject in protraiture, or "compression effects" that make the most of the telephoto lens.
		The optical system incorporates a LD (Low Dispersion) lens, resulting in clear sharp images free of chromatic aberration.
	www.tamron.com /lenses/prod/70300mm.asp (133 words)

	Amazon.com: Canon EF 300mm f/2.8L IS USM Telephoto Lens for Canon SLR Cameras: Camera & Photo (Site not responding. Last check: 2007-10-08)
		Canon Lens Trunk 300 for EF 300mm f/2.8L IS USM Lens
		The 300mm f/2.8L IS lens focuses closer (down to 8.2 feet/2.5m), offers the world’s fastest autofocus when used with EOS bodies having 45-point AF, is gasketed and sealed against dust and moisture, and has a lightweight magnesium alloy barrel and tripod collar.
		In this telephoto lens line-up, the focal lengths range from 135mm to 300mm.
	www.amazon.com /exec/obidos/tg/detail/-/B0000ALKBU?v=glance (865 words)

	Fast aperture telephoto zoom lens that provides excellent optical performance for Digital SLR cameras and film SLR ...
		This telephoto zoom lens provides a large F4 aperture at all focal lengths.
		The new multi layer lens coating and lens design reduce flare and ghosting, and also maintains minimal light-fall-off, superior peripheral brightness is ensured.
		Two SLD glass elements are used in the front lens group and two in the rear lens group for superior correction of several aberrations for superior image quality throughout the entire zoom range.
	www.sigma-photo.co.jp /english/lens/telezoom/100_300_4.htm (286 words)

	Steves Digicams - Kenko 8x32 Add-On Telephoto Lens
		This lens can be mounted on various digicams using the appropriate, precision engineered adapter.
		This lens comes complete with the original eyepiece cup, carrying case and strap and can be used as regular monocular field scope when not mounted on a camera.
		The photo on the left is with the S20 in full telephoto, the photo on the right is the S20 in full telephoto plus the Kenko 8x32 lens.
	www.steves-digicams.com /kenko_8x32.html (325 words)

	Ten Sigma DG telephoto lenses: Digital Photography Review
		This time ten new EX telephoto lenses including three single focus telephoto lenses (APO 300mm F2.8 EX, APO 500mm F4.5 EX APO 800mm F5.6 EX) will be introduced to market as DG lens series, which demonstrates high performance with digital single, lens reflex cameras.
		This lens ensures a superior level of precision from 50mm standard to 500mm ultra telephoto focal length range.
		This telephoto zoom lens has a large maximum aperture of F2.8 that is constant throughout the zoom range.
	www.dpreview.com /news/0502/05021401sigma10dgs.asp (552 words)

	Re: Telephoto Lens (Site not responding. Last check: 2007-10-08)
		Chip, a 500mm Mirror lens would be a total waste of money.
		They are heavier and longer than a mirror lens but give a sharper and more contrastier picture than the Mirror lens.
		There were several 400mm lens made that were inexpensive, such as Quantaray and Spiratone.
	www.acecam.com /photography/10768.html (173 words)

	Sigma 50-500mm Telephoto Lens - lonestardigital.com
		It takes a strong telephoto lens to get in where I want to be for long distance or closeup wildlife and sports photography...
		The whole idea of a zoom lens is to take the place of a range of single focal length lenses, but as far as sports shooting goes, it's hard to find that "perfect" range for consistent use.
		Included with the lens is a bayonet mount hood (shown in the photos above) remarkably similar in shape to the new Nikkor AF-S lens hoods.
	www.lonestardigital.com /Sigma_50-500.htm (641 words)

	Buy the Tiffen Telephoto Conversion Lens (00190) and other Digital Camera Lenses and Filters at circuitcity.com
		Still needs close up lens The overall value of the zoom is what surprised me the most...
		Telephoto lens: This Tiffen lens doubles the focal length to bring distant objects into closer view.
		Coating: Each lens element is multi-coated to reduce glare and reflections.
	www.circuitcity.com /ssm/Tiffen-Telephoto-Conversion-Lens-00190-/sem/rpsm/oid/38427/rpem/ccd/productDetail.do (176 words)

	Digital Cameras: Digital Camera Batteries, Telephoto Lens, Wide Angle Lens, 35mm Cameras (Site not responding. Last check: 2007-10-08)
		A telephoto lens from 123AV is great for bird watching, sports photography or other subjects that are far away from you and your camera.
		A telephoto lens is easy to use, and is invaluable when filming nature.
		A wide angle lens is great for filming large areas.
	www.123av.com /Photography.asp (232 words)

	MTO-11CA 10/1000 Telephoto Lens
		The MTO-11CA 10/1000 Telephoto telescopic lens serves as an interchangeable one for the Zenit SLR cameras, intended for fl-and-white and color photography, used to take close-ups of remote objects, inaccessible parts of terrain, landscapes, architectural details and sports competitions, ideal for photographic hunting.
		The MTO-11CA 10/1000 Telephoto Lens is furnished with a set of colour filters, and supplied in a handy lether carrying case.
		The lens diameter at the mounting flange is 126 mm or 63 mm radius.
	www.rugift.com /photocameras/mto_11_ca_lens.htm (396 words)

	Telephoto lenses for EOS
		Since the last version of the EOS FAQ a few new telephoto lenses for EOS have been released and the price of all lenses has increased.
		I'll define "telephoto" as a lens of over 300mm in focal length.
		The lens is $4600, so adding the two TCs pushes it to close to $5400, but you do then get 3 good lenses, a 300/2.8, a 420/4 and a 600/5.6, all AF and all capable of "pro" quality images.
	bobatkins.photo.net /info/faq30/telefoto.htm (1329 words)

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