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Telephoto Lens Compression EXPLAINED
Telephoto Lens Compression EXPLAINED
Published: 2013/08/19
Channel: Matt Granger
How to control your background with a 70 - 200 telephoto lens
How to control your background with a 70 - 200 telephoto lens
Published: 2017/12/27
Channel: Fstoppers
A6500 - Massive 500-1000mm Lens - It
A6500 - Massive 500-1000mm Lens - It's 80 Bucks, Does it Suck?
Published: 2017/03/31
Channel: Christopher Burress
Differences Between Wide Lenses and Telephoto Lenses: Photo on the Go with Joe McNally: Adorama TV
Differences Between Wide Lenses and Telephoto Lenses: Photo on the Go with Joe McNally: Adorama TV
Published: 2014/12/11
Channel: Adorama
Do you NEED a TELEPHOTO LENS?
Do you NEED a TELEPHOTO LENS?
Published: 2018/06/27
Channel: James Popsys
5 Reasons You Should Use a Telephoto Lens for Landscape Photos
5 Reasons You Should Use a Telephoto Lens for Landscape Photos
Published: 2018/06/14
Channel: Shutterbug
Giant iPhone Zoom Lens - Does It Suck?
Giant iPhone Zoom Lens - Does It Suck?
Published: 2016/05/16
Channel: Unbox Therapy
1200mm lens - Surf Photography with ULTRA Telephoto zoom lens
1200mm lens - Surf Photography with ULTRA Telephoto zoom lens
Published: 2017/01/23
Channel: Matt Granger
In Depth Review | Apexel 4 in 1 | 18x Smartphone Telephoto Lens Kit
In Depth Review | Apexel 4 in 1 | 18x Smartphone Telephoto Lens Kit
Published: 2018/05/04
Channel: Troys Hobbies
How to Use a Telephoto Zoom Lens
How to Use a Telephoto Zoom Lens
Published: 2015/01/23
Channel: TbonesTech
TOO CHEAP? Tzumi SmartLens Telephoto 8x Zoom Lens Review
TOO CHEAP? Tzumi SmartLens Telephoto 8x Zoom Lens Review
Published: 2016/08/23
Channel: Cora
Canon EF 600mm F/4 IS USM | THE $12000 SUPER TELEPHOTO LENS on the Canon EOS 1Dx Mark II
Canon EF 600mm F/4 IS USM | THE $12000 SUPER TELEPHOTO LENS on the Canon EOS 1Dx Mark II
Published: 2016/08/02
Channel: the daniel life
Canon T5i and T6i Wide Angle and Telephoto lens
Canon T5i and T6i Wide Angle and Telephoto lens
Published: 2016/07/27
Channel: Huck's World
Super Zoom Lens for your Phone!
Super Zoom Lens for your Phone!
Published: 2017/04/15
Channel: Tech Unit
Landscape Photography - 6 Reasons Why You Need A Telephoto Lens
Landscape Photography - 6 Reasons Why You Need A Telephoto Lens
Published: 2018/02/07
Channel: Andy Mumford
Smartphone 18x Telephoto lens review, tutorial, unboxing
Smartphone 18x Telephoto lens review, tutorial, unboxing
Published: 2017/09/29
Channel: K F
Canon 300mm f/4L USM Review - Best Tele For Your Money?
Canon 300mm f/4L USM Review - Best Tele For Your Money?
Published: 2013/08/02
Channel: DigitalRev TV
Telephoto Photography - Why are my pictures blurry?
Telephoto Photography - Why are my pictures blurry?
Published: 2017/01/03
Channel: 52Things: Rob & Jonas
The Best Telephoto Zoom Lens for Canon APS-C?
The Best Telephoto Zoom Lens for Canon APS-C?
Published: 2015/10/16
Channel: Christopher Frost Photography
Turning a 1300mm lens into a 16,000mm ! ZOOM MONSTER telephoto !!
Turning a 1300mm lens into a 16,000mm ! ZOOM MONSTER telephoto !!
Published: 2017/08/23
Channel: Duncan Dimanche
World
World's sharpest Tele lens! Moon, 300x zooming in! 4K, UHD, Leica 2.8/400 mm
Published: 2016/03/13
Channel: Markus Stark
Canon 100-400mm: Best telephoto lens for video?
Canon 100-400mm: Best telephoto lens for video?
Published: 2015/11/06
Channel: Fenchel & Janisch
Canon EF 101: Telephoto Lenses
Canon EF 101: Telephoto Lenses
Published: 2018/06/28
Channel: CanonUSA
8x Optical Zoom Telescope Camera Lens [For Smartphone] Review & Unboxing
8x Optical Zoom Telescope Camera Lens [For Smartphone] Review & Unboxing
Published: 2017/01/22
Channel: Samuel Lewis
The Angry Photographer: WHICH TELEPHOTO ZOOM IS BEST?? Nikon Lens Secrets to save you $$
The Angry Photographer: WHICH TELEPHOTO ZOOM IS BEST?? Nikon Lens Secrets to save you $$
Published: 2015/03/11
Channel: Theoria Apophasis
18 X Zoom Universal Telescope Lens for Smart Phones
18 X Zoom Universal Telescope Lens for Smart Phones
Published: 2017/07/28
Channel: CREATIVE TECH
iPhone Telephoto Lens?!
iPhone Telephoto Lens?!
Published: 2016/04/20
Channel: Matt Schaefer
420-800mm F/8.3-16 HD Super Telephoto Manual Zoom Lens
420-800mm F/8.3-16 HD Super Telephoto Manual Zoom Lens
Published: 2016/12/12
Channel: TOMTOP
Best budget telephoto lens for sports or wild life photography or else best bang for your buck!!!
Best budget telephoto lens for sports or wild life photography or else best bang for your buck!!!
Published: 2016/11/16
Channel: Blue Sky Photography
Apexel 18x NEW Super Zoom Phone Lens Unboxing Review Lens On Samples
Apexel 18x NEW Super Zoom Phone Lens Unboxing Review Lens On Samples
Published: 2017/10/21
Channel: Ansuman Mahapatra
Weird lens reviews: Samyang 800mm f/8 Mirror, & 2x telecoverter (with samples)
Weird lens reviews: Samyang 800mm f/8 Mirror, & 2x telecoverter (with samples)
Published: 2014/02/12
Channel: Christopher Frost Photography
How to Buy your first SUPER Telephoto Lens
How to Buy your first SUPER Telephoto Lens
Published: 2016/09/01
Channel: Clint the Audio Guy
Quick Look | Canon Super Telephoto 1200mm f/5.6L
Quick Look | Canon Super Telephoto 1200mm f/5.6L
Published: 2015/05/01
Channel: B and H
Moment 60mm 2x Zoom Tele Lens for Smartphones & Tablets - [Review]
Moment 60mm 2x Zoom Tele Lens for Smartphones & Tablets - [Review]
Published: 2015/12/30
Channel: Andrew OHara
What Is A Telephoto Lens?
What Is A Telephoto Lens?
Published: 2015/08/25
Channel: Taylor Jackson
Cheap Telephoto Lens: Bower 500mm F/8 Review
Cheap Telephoto Lens: Bower 500mm F/8 Review
Published: 2016/01/07
Channel: bigtb1717
Which Sony Mirrorless Telephoto Lens to Buy? (2018)
Which Sony Mirrorless Telephoto Lens to Buy? (2018)
Published: 2018/05/14
Channel: that1cameraguy
Wide angle vs Telephoto Depth of Field
Wide angle vs Telephoto Depth of Field
Published: 2014/11/05
Channel: Matt Granger
How To Use the Precision Design 2.5x Telephoto & .45x Wide-Angle Lens Kit (PD-TWK)
How To Use the Precision Design 2.5x Telephoto & .45x Wide-Angle Lens Kit (PD-TWK)
Published: 2016/08/17
Channel: Cameta Camera
Using a Telephoto lens on iPhone’s Telephoto camera.
Using a Telephoto lens on iPhone’s Telephoto camera.
Published: 2018/06/07
Channel: olloclip
1200mm Canon 5.6 L Super Telephoto Lens
1200mm Canon 5.6 L Super Telephoto Lens
Published: 2009/04/28
Channel: B and H
Nikon
Nikon's BEST Ultra Telephoto Prime lens - FIELD TESTED
Published: 2018/07/10
Channel: Matt Granger
800mm Telephoto Lens (Canon EF Mount) for $100
800mm Telephoto Lens (Canon EF Mount) for $100
Published: 2012/11/25
Channel: ScreamingTreeFilm
5200mm Canon Lens World
5200mm Canon Lens World's MOST powerful Super telephoto EF FD (updated upload)
Published: 2009/11/27
Channel: HDCAMAN
Giant Lens for your Smartphone!?
Giant Lens for your Smartphone!?
Published: 2016/09/23
Channel: Vimal Chintapatla
Giant Lens for your Smartphone!?
Giant Lens for your Smartphone!?
Published: 2018/02/08
Channel: ExploreSumit
3 Budget Telephoto Lenses for MFT
3 Budget Telephoto Lenses for MFT
Published: 2016/08/29
Channel: Steve Seguin
TAMRON 70-210 f4 Lens Review | Best Budget Telephoto Lens?
TAMRON 70-210 f4 Lens Review | Best Budget Telephoto Lens?
Published: 2018/06/02
Channel: Jared Polin
AMIR 3 in 1 Telephoto Lens Kit for your Phone
AMIR 3 in 1 Telephoto Lens Kit for your Phone
Published: 2017/12/04
Channel: BeatTheBush DIY
Photography Tips : How Does a Telephoto Lens Work?
Photography Tips : How Does a Telephoto Lens Work?
Published: 2009/07/07
Channel: eHow
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
  (Redirected from Telephoto)
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A collection of telephoto lenses

In photography and cinematography, a telephoto lens is a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length.[1] This is achieved by incorporating a special lens group known as a telephoto group that extends the light path to create a long-focus lens in a much shorter overall design. The angle of view and other effects of long-focus lenses are the same for telephoto lenses of the same specified focal length. Long-focal-length lenses are often informally referred to as telephoto lenses although this is technically incorrect: a telephoto lens specifically incorporates the telephoto group.[2]

Telephoto lenses are sometimes broken into the further sub-types of medium telephoto: lenses covering between a 30° and 10° field of view (67mm to 206mm in 35mm film format), and super telephoto: lenses covering between 8° through less than 1° field of view (over 300mm in 35mm film format).[3]

Construction[edit]

A 500 mm lens of a non-telephoto design
A 150–500mm telephoto zoom lens

In contrast to a telephoto lens, for any given focal length a simple lens of non-telephoto design is constructed from one lens (which can, to minimize aberrations, consist of several elements to form an achromatic lens). To focus on an object at infinity, the distance from this single lens to focal plane of the camera (where the sensor or film is respectively) has to be adjusted to this focal length. For example, given a focal length of 500 mm, the distance between lens and focal plane is 500 mm. The farther the focal length is increased, the more the physical length of such a simple lens makes it unwieldy.

But such simple lenses are not telephoto lenses, no matter how extreme the focal length – they are known as long-focus lenses.[1] While the optical centre of a simple ("non-telephoto") lens is within the construction, the telephoto lens moves the optical centre in front of the construction. While the length of a long-focus lens approximates its focal length, a telephoto lens manages to be shorter than its focal length. E.g., a telephoto lens might have a focal length of 400 mm, while it is shorter than that.

Diagram of a typical telephoto lens with a large positive lens and a smaller negative telephoto group combined to create a much longer focal length - f.

A telephoto lens works by having the outermost (i.e. light gathering) element of a much shorter focal length than the equivalent long-focus lens and then incorporating a second set of elements close to the film or sensor plane that extend the cone of light so that it appears to have come from a lens of much greater focal length. The basic construction of a telephoto lens consists of front lens elements that, as a group, have a positive focus. The focal length of this group is shorter than the effective focal length of the lens. The converging rays from this group are intercepted by the rear lens group, sometimes called the "telephoto group," which has a negative focus. The simplest telephoto designs could consist of one element in each group, but in practice, more than one element is used in each group to correct for various aberrations. The combination of these two groups produces a lens assembly that is physically shorter than a long-focus lens producing the same image size.

Diagram of a catadioptric mirrors lens.

This same property is achieved in camera lenses that combine mirrors with lenses. These designs, called catadioptric, 'reflex', or 'mirror' lenses,have a curved mirror as the primary objective with some form of negative lens in front of the mirror to correct optical aberrations. They also use a curved secondary mirror to relay the image that extends the light cone the same way the negative lens telephoto group does. The mirrors also fold the light path. This makes them much shorter, lighter, and cheaper than an all refractive lens, but at the cost of some optical compromises due to aberrations caused by the central obstruction from the secondary mirror.

The heaviest non-Catadioptric telephoto lens for civilian use was made by Carl Zeiss and has a focal length of 1700 mm with a maximum aperture of f/4, implying a 425 mm (16.7 in) entrance pupil. It is designed for use with a medium format Hasselblad 203 FE camera and weighs 256 kg (564 lb).[4]

The telephoto lens design has also been used for wide angles, at least once in the case of the Olympus XA where it permitted a 35mm focal length to fit in an extra compact camera body.[5]

Retrofocus lenses[edit]

A diagram of light travel through a wide-angle lens showing how focal length can be shorter than the lens.

Inverting the telephoto configuration, employing one or more negative lens groups in front of a positive lens group, creates a wide-angle lens with an increased back focal distance. These are called retrofocus lenses or inverted telephotos, which have greater clearance from the rear element to the film plane than their focal length would permit with a conventional wide-angle lens optical design. This allows for greater clearance for other optical or mechanical parts such as the mirror parts in a single-lens reflex camera. Zoom lenses that are telephotos at one extreme of the zoom range and retrofocus at the other are now common.[citation needed]

History[edit]

A Canon F-1, 35mm camera with a telephoto zoom lens.

The concept of the telephoto lens, in reflecting form, was first described by Johannes Kepler in his Dioptrice of 1611,[6] and re-invented by Peter Barlow in 1834.[7]

Histories of photography usually credit Thomas Rudolphus Dallmeyer with the invention of the photographic telephoto lens in 1891, though it was independently invented by others about the same time; some credit his father John Henry Dallmeyer in 1860.[8]

In 1883 or 1884 New Zealand photographer Alexander McKay discovered he could create a much more manageable long-focus lens by combining a shorter focal length telescope objective lens with negative lenses and other optical parts from opera glasses to modify the light cone. Some of his photographs are preserved in the holdings of the Turnbull Library in Wellington, and two of these can be unequivocally dated as having been taken during May 1886. One of McKay’s photographs shows the Russian warship Vjestnik anchored in Wellington harbour about two and a half kilometres away, with its rigging lines and gun ports clearly visible. The other, taken from the same point, is of a local hotel, the Shepherds Arms, about 100 metres distant from the camera. The masts of the Vjestnik are visible in the background. McKay's other photographic achievements include photo-micrographs, and a ‘shadow-less technique’ for photographing fossils.[9]

McKay presented his work to the Wellington Philosophical Society (the precursor of the Royal Society of New Zealand) in 1890.[10]

See also[edit]

References[edit]

External links[edit]

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