Noh Ironogi Spotting Scopes

Scope Mount Adapter

Anamorphic Format

Development

Figure 1. If shooting in widescreen picture format on 4-perf film, without an anamorphic lens, the available film area is not used completely; some of the film surface is wasted on the frame lines.

Figure 2. With an anamorphic lens, the picture is optically squeezed in the horizontal dimension to cover the entire film frame, resulting in a better picture quality. When projecting the film, the projector must use a complementary lens of the same anamorphic power to stretch the image horizontally back to its original proportions.

Early prototypes and working systems

The process of anamorphosing optics was developed by Henri Chrtien during World War I to provide a wide angle viewer for military tanks. The optical process was called Hypergonar by Chrtien and was capable of showing a field of view of 180 degrees. After the war, the technology was first used in a cinematic context in the short film Pour Construire un Feu (To Build a Fire) in 1927 by Claude Autant-Lara. Anamorphic widescreen was not used again for cinematography until Twentieth Century-Fox bought the rights to the technique in 1952 to create its CinemaScope widescreen technique. CinemaScope was one of many widescreen formats developed in the 1950s to compete with the popularity of television and bring audiences back to the cinemas. The Robe, which premiered in 1953, was the first feature film released that was filmed with an anamorphic lens.

The development of anamorphic widescreen arose due to a desire for wider aspect ratios. The modern anamorphic widescreen format has an aspect ratio of 2.39:1, meaning the picture width is 2.39 times its height. Academy format 35 mm film (standard non-anamorphic full frame with sound tracks in the image area) has an aspect ratio of 1.37:1, which is not as wide (or, conversely, is too tall). In non-anamorphic spherical (flat) widescreen imaging, the picture is recorded on film so that its full width fits within the film frame, and substantial film frame area is wasted on portions that will be matted out by the time of projection, either on the print or in the projector, in order to create a widescreen image in the theater (Figure 1).

To make full use of the available film, an anamorphic lens is used during recording. Up to the early 1960s, three major methods of anamorphosing the image were used: counter-rotated prisms (e.g.Ultra Panavision), curved mirrors in combination with the principle of Total Internal Reflection (e.g. Technirama), and cylindrical lenses (lenses curved, and hence squeezing the scene being photographed in only one direction, as per a cylinder, e.g. the original CinemaScope system based on Henri Chrtien's design). Whatever the method used, the anamorphic lens leaves the image on film looking as if it had been stretched vertically. This deliberate geometric distortion is then reversed upon projection, resulting in a wider aspect ratio on-screen than that of the frame as recorded on film.

An anamorphic lens consists of a regular spherical lens, plus an anamorphic attachment (or integrated lens element) that does the anamorphosing. The anamorphic element operates at infinite focal length (so that it has little or no effect on the focus of the prime camera lens onto which it is mounted), but still nevertheless anamorphoses the optical field. When you use an anamorphic attachment, you use a spherical lens of a different focal length than you would for 1.85:1 (one sufficient to produce an image the full height of the frame and twice the width), and then the anamorphic attachment squeezes 2x horizontally. Specialized reverse anamorphic attachments existed that were relatively rarely used on projection and camera lenses to expand the image in the vertical space (e.g. the early Technirama system mentioned above), so that (in the case of the common two-times anamorphic lens) a frame twice as high as it might have been filled the available film area. Since a larger film area needed to be used to record the same picture, quality was increased.

The distortion introduced in the picture must be corrected when the film is played back, so another lens is used during projection that either expands the picture back to its correct proportions or (as in the case of the now defunct Technirama system) squeezes the image vertically to restore normal geometry. It should be noted that the picture is not manipulated in any way in the complementary dimension to the one anamorphosed (horizontally squeezed or vertically stretched).

It may seem that it would be easier to simply use a wider film for recording movies; however, 35 mm film was already in widespread use, and it was more economically feasible for film producers and exhibitors to simply attach a special lens to the camera or projector, rather than investing in a new film format, along with the attendant cameras, projectors, and editing equipment.

Cinerama was an earlier attempt to solve the problem of high-quality widescreen imaging, but anamorphic widescreen eventually proved to be more practicable. Cinerama preceded anamorphic films, but consisted of three projected images side-by-side on the same screen: the images never blended together perfectly at the edges, and it required three projectors; a 6-perf-high frame, which required four times as much film; and three cameras (eventually just one camera with three lenses and three streaming reels of film and the attendant machinery, which presented synchronization problems). Nonetheless, the format was popular enough with audiences to spur studios to the wide screen developments of the early 1950s. A few films were distributed in Cinerama format and shown in special theaters. Anamorphic widescreen was attractive to studios because of its similar high aspect ratio (Cinerama was 2.59), without the disadvantages that came with the Cinerama format's simultaneous reels and the complexity of synchronizing the reels.

The common anamorphic widescreen film format in use today is commonly called Scope or 2.35:1 (the latter being a misnomer born of old habit; see "2.35, 2.39, or 2.40?" below). Filmed in Panavision is a phrase contractually required for films shot using Panavision's anamorphic lenses. All of these phrases mean the same thing: the final print uses a 2:1 anamorphic projector lens that expands the image by exactly twice the amount horizontally as vertically. This format is essentially the same as at the time of CinemaScope, except for minor technical developments.

There are artifacts that can occur when using an anamorphic camera lens that do not occur when using an ordinary spherical lens. One is a kind of lens flare that has a long horizontal line usually with a blue tint and is most often visible when there is a bright light, such as from car headlights, in the frame with an otherwise dark scene. This artifact is not always considered to be a problem. It has come to be associated with a certain cinematic look and is in fact sometimes emulated using a special effect filter in scenes that were not shot using an anamorphic lens. Another common aspect of anamorphic lenses is that light reflections in the lens will be elliptical rather than round, as they are in spherical cinematography. Additionally, wide angle anamorphic lenses of less than 40 mm focal length produce a cylindrical perspective, which some directors and cinematographers, particularly Wes Anderson, use as a stylistic trademark.

Another characteristic of anamorphic camera lenses is that out-of-focus elements tend to be blurred more vertically. An out-of-focus point of light in the background will appear as a vertical oval rather than a circle. When the camera shifts focus, there is often a noticeable effect where elements appear to stretch vertically when going out of focus. However, the commonly cited claim that anamorphic lenses produce a shallower depth of field is not entirely true. Because of the cylindrical element in the lens, anamorphic lenses take in a horizontal angle of view twice as wide as a spherical lens of the same focal length. Because of this, cinematographers will often use a 50 mm anamorphic lens when they would otherwise use a 25 mm spherical lens, a 70 mm rather than a 35 mm, and so on.

A third characteristic, particularly of simple anamorphic add-on attachments to prime lenses, is anamorphic mumps. For reasons of practical optics, the anamorphic squeeze is not uniform across the image field in any system, cylindrical, prismatic or mirror-based. This variation results in some areas of the film image appearing more stretched than others. In the case of an actor's face in the center of the screen their faces look somewhat like they had the mumps, hence the name for the phenomenon. Conversely, at the edges of the screen actors in full length view can become skinny-looking. In medium shots, if they walk across the screen from one side to the other, they increase in apparent girth. Early Cinemascope presentations in particular (using Chrtien's off-the-shelf lenses) suffered from it. The solution was to link the anamorphic squeeze of the add-on adapter to the focus position of the prime lens, so that as focus changed the anamorphic ratio changed along with it, resulting in a normal-looking geometry in the area of interest on-screen. In early prismatic systems such as Panavision's Ultra-Panavision system, the angle of counter-rotation between prisms was linked by a mechanical system to the focus ring of the prime lens. In later cylindrical lens systems, the change in aspect ratio required between focus positions was achieved by combining two sets of anamorphic optics in one: a robust "squeeze" system coupled with a slight expansion sub-system. The expansion sub-system was counter-rotated in relation to the main squeeze system, all in mechanical interlinkage with the focus mechanism of the prime lens. The combination of squeeze and expansion changed the anamorphic ratio to the extent required to minimize the effect of anamorphic mumps in the area of interest in the frame. Though these techniques were regarded as a fix for the anamorphic mumps, they were a compromise. Cinematograhpers still needed to be careful with their framing of the scene so that effects of the change in aspect ratio were not readily apparent. The first company to produce an anti-mumps system was Panavision in the late 1950s.

While the anamorphic scope widescreen format is still in use as a camera format, it has been losing popularity in favor of flat formats, mainly Super 35 mm film. (In Super 35, the film is shot flat and can then be matted and optically printed as an anamorphic release print.) There can be several reasons for this:

An anamorphic lens can create artifacts or distortions as described above.

An anamorphic lens is more expensive than a spherical lens.

Because the anamorphic-scope camera format does not preserve any of the image above and below the scope frame, it may not transfer as well to narrower aspect ratios, such as 4:3 or 16:9 for full screen television.

Film grain is less of a concern because of the availability of higher-quality film stocks and digital intermediates, although the anamorphic format will always yield higher definition than the non-anamorphic format.

The aperture of the lens, as seen from the front, appears as an oval.

Anamorphic scope as a printed film format, however, is well established as a standard for widescreen projection. Regardless of the camera formats used in filming, the distributed prints of a film with a 2.39:1 theatrical aspect ratio will always be in anamorphic widescreen format. This is not likely to soon change because movie theaters around the world don't need to invest in special equipment to project this format; all that is required is an anamorphic projection lens, which has long been considered standard equipment.

Other widescreen film formats (commonly 1.85:1 and 1.66:1) are simply cropped in vertical size to produce the widescreen effect, a technique known as masking or matting. This can occur either during filming, where the framing is masked in the gate, or in the lab, which can optically create a matte onto the prints. Either method produces a frame similar to that in Figure 1, and is known as a hard matte. Many film prints today have no matte, though the film is framed for the intended aspect ratio; this approach is called full-frame filming, since most spherical 4-perf cameras retain the silent gate. In these, the film captures additional information that is masked out during projection using an aperture mask in the projector gate, and is known as soft matte. This approach allows filmmakers the freedom to include the additional picture in an open matte 4:3 transfer of the film and avoid pan and scan, by protecting the frame for 4:3.

2.35, 2.39, or 2.40?

One common misconception about the anamorphic format concerns the actual number of the aspect ratio itself. Since the anamorphic lenses in virtually all 35 mm anamorphic systems provide a 2:1 squeeze; one would logically conclude that a 1.37:1 full academy gate would lead to a 2.74:1 aspect ratio if used with anamorphic lenses. However, due to a difference in the camera gate aperture and projection mask sizes for anamorphic films, the image dimensions used for anamorphic film vary from flat (spherical) counterparts. To complicate matters, the SMPTE standards for the format have varied over time; to further complicate things, pre-1957 prints took up the optical soundtrack space of the print (instead having magnetic sound on the sides), which made for a 2.55:1 ratio.

The first SMPTE definition for anamorphic projection with an optical sound track down the side (PH22.106-1957), made in December 1957, standardized the aperture to 0.839 in by 0.715 in (1.17:1). The aspect ratio for this aperture, after a 2x unsqueeze, rounds to 2.35:1. A new definition was created in October 1970 (PH22.106-1971) which made the vertical dimension slightly smaller in order to make splices less noticeable (as anamorphic prints use more of the negative frame area than any other modern format) when projected. This new aperture size, 0.838 in by 0.700 in, (1.19:1) makes for an unsqueezed ratio of 2.39:1 (more commonly referred to as 2.40:1). The most recent revision, from August 1993 (SMPTE 195-1993), slightly altered the dimensions so as to standardize a common aperture width (0.825 in) for all formats, anamorphic and flat. At these modern dimensions (0.825 in by 0.690 in1.19:1), the unsqueezed ratio remains at 2.39:1.

Anamorphic prints are still often called Scope or 2.35 by projectionists, cinematographers, and others working in the field, if only by force of habit. 2.39 is in fact what they generally are referring to (unless discussing films using the process between 1958 and 1970), which is itself usually rounded up to 2.40. With the exception of certain specialist and archivist areas, generally 2.35, 2.39, and 2.40 mean the same to most professionals, whether they themselves are even aware of the changes or not.

Lens makers and corporate trademarks

See also: List of anamorphic format trade names

There are numerous companies that are known for manufacturing anamorphic lenses. The following are the well known in the film industry:

Origination

Panavision is the most common source of anamorphic lenses, with lens series ranging from 20mm to a 2,000mm anamorphic telescope. The C-Series, which is the oldest lens series, are small and lightweight, which makes them very popular for steadicams. Some cinematographers prefer them to newer lenses because they are lower in contrast. The E-Series, of Nikon glass, are sharper than the C-Series and are better color-matched. They are also faster, but the minimum focus-distance of the shorter focal lengths is not as good. The E135mm, and especially the E180mm, are great close-up lenses with the best minimum focus of any long Panavision anamorphic lenses. The Super (High) Speed Lenses (1976), also by Nikon, are the fastest anamorphic lenses available, with T-stops between 1.4 and 1.8; there is even one T1.1 50 mm, but, like all anamorphic lenses, they need to be stopped-down for good performance because they are quite softly-focussed when wide open. The Primo and Close-Focus Primo Series (1989) are based on the spherical Primos and are the sharpest Panavision anamorphic lenses available. They are completely color-matched, but also very heavy: about 57 kilograms. The G-Series (2007), Panavision's latest anamorphic lens series, performance and size comparable with E-series, in lightweight and compact similar to C-series.

Vantage Film, designers and manufacturers of Hawk Lenses. The entire Hawk lens system consists of 50 different prime lenses and 5 zoom lenses, all of them specifically developed and optically computed by Vantage Film. Hawk Lenses have their anamorphic element in the middle of the lens (not up front like Panavision), which makes them more flare-resistant. This design choice also means that if they do flare, one does not get the typical horizontal flares. The C-Series, which were developed in the mid-1990s, are relatively small and lightweight. The V-Series (2001) and V-Plus Series (2006) are an improvement over the C-Series as far as sharpness, contrast, barrel-distortion and close-focus are concerned. This increased optical performance means a higher weight, however (each lens is around 4-5 kilograms). There are 14 lenses in this series which goes from 25 mm to 250 mm. The V-Series also have the best minimum focus of any anamorphic lens series available and as such can rival spherical lenses. Vantage also offers a series of lightweight lenses called V-Lite. They are 5 very small anamorphic lenses (about the size of a Cooke S4 spherical lenses), which are ideal for handheld and steadicam while also giving an optical performance comparable to the V and V-Plus lenses. In 2008 Vantage introduced the Hawk V-Lite 16, a set of new lenses for 16 mm anamorphic production, as well as the Hawk V-Lite 1.3x lenses, which make it possible to use nearly the entire sensor area of a 16:9 digital camera and at the same time provide the popular 2.39:1 release format.

Joe Dunton Camera (JDC): Manufacturer and rental house based in Britain and North Carolina, which adapts spherical lenses to anamorphic by adding a cylindrical element. Its most popular lenses are adapted Cooke S2/S3, but they have also adapted Zeiss Super Speeds and Standards, as well as Canon lenses.

Elite Optics, manufactured by JSC Optica-Elite Company in Russia and sold in the United States by Slow Motion Inc.

Technovision a French manufacturer that, like JDC, also has adapted spherical lenses for anamorphic.

Isco Optics a German company that developed the Arriscope line for Arri in 1989.

Projection

Schneider Kreuznach, (also called Century) makers of the most widely used[verification needed] anamorphic projection lenses in the world. The company also manufactures add-on anamorphic adaptor lenses that can be mounted on digital video cameras.

ISCO Precision Optics is the other dominant manufacturer of theatrical cinema projection lenses.

Super 35 and Techniscope

Although many films projected anamorphically have been shot using anamorphic lenses, there are often aesthetic and technical reasons that make shooting with spherical lenses preferable. If the director and cinematographer still wish to retain the 2.39:1 aspect ratio, anamorphic prints can be made from spherical negatives. Because the 2.39:1 image cropped from an Academy ratio 4-perf negative causes considerable waste of frame space, and since the cropping and anamorphosing of a spherical print requires an intermediate lab step, it is often attractive for these films to use a different negative pulldown method (most commonly 3-perf, but occasionally Techniscope 2-perf) usually in conjunction with the added negative space Super 35 affords.

However with advancements in digital intermediate technology, the anamorphosing process can now be completed as a digital step with no degradation of image quality. 3-perf and 2-perf also pose minor problems for visual effects work. The area of the film in 4-perf work that is cropped out in the anamorphosing process nonetheless contains picture information which is useful for such visual effects tasks as 2D and 3D tracking. This mildy complicates certain visual effects efforts for productions using 3-perf and 2-perf, making anamorphic prints struck digitally from centre cropped 4-perf Super 35 the popular choice in large budget visual effects driven productions.

See also

Arriscope

Anamorphosis

Aspect ratio

Cine 160

Letterbox

List of film formats

Pan and scan

References

^ a b Konigsberg, Ira. The Complete Film Dictionary Meridian. 1987. "Anamorphic lens" pp. 11-12

^ Hart, Martin.(2000). Widescreen museum "Of Apertures and Aspect Ratios" Retrieved July 8, 2006.

External links

"Of Apertures and Aspect Ratios", Widescreen Museum

Mitchell, Rick, "The Widescreen Revolution", Operating Cameraman (Society of Camera Operators) (Summer, 1994), http://www.soc.org/opcam/04_s94/mg04_widescreen.html, retrieved 2008-10-06 

v  d  e

Motion Picture Film Formats

Film gauges

8 mm  9.5 mm  16 mm  35 mm  70 mm

Film formats

35 mm: CinemaScope (1953)  VistaVision (1954)  Modern anamorphic (1957)  Super 35 (1982)

70 mm: Todd-AO (1953)  IMAX (1970)

35 mm 3 strips: Cinerama (1952)  Kinopanorama (1958)  Cinemiracle (1958)

Video aspect ratio standards

4:3  16:9  14:9

Video framing issues

Widescreen  Anamorphic widescreen  Letterbox  Fullscreen or Pan and scan  Open matte  Shoot and protect

Portal:Film

Categories: Film and video technology | Movie film formats | Films shot anamorphically | 1953 introductionsHidden categories: All pages needing factual verification | Wikipedia articles needing factual verification from July 2007

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Excalibur Crossbow 9860 Scope Mount For Exocet XBow $40.81 The Excalibur Scope Mount is built from strong anodized aluminum to solidly and securely position your scope for accurate shooting. Using a weaver type base it installs in seconds using 4 pretapped mounting holes located on every trigger unit.

ProMag AR-15 Accessories, AR-15 Flat Top 1 Inch Scope Mount $81.95 The scope mount allows 1 inch diameter tube scope directly to the rifle. The mount ensures proper scope height without the need for extra high rings. The mount is quick detachable, held in place by a full length spring locking bar with two thumb screws. Constructed of hard anodized aircraft grade aluminum.

Konus 7120 2060 x 80 Spotting Scope Tripod Green $341.24 The Konus 80mm spotting scope provides impeccable optical quality. Fully rubber armored to prevent shocks and scratches. Also an extendable sunshade provides a barrier from ambient light and reflection. The telescope type eyepiece provides clear and comfortable viewing from many distances. Everything you need to completely enjoy the outdoors is included. 80mm spotting scope with 45 degree eyepiece for comfortable viewing. Quick pivot set screw allows the unit to rotate and provide viewing in any situation. Multi coated optics for clear bright viewing and an oversized ocular for quick acquisition. Premium tabletop tripod with extendable legs and panhead mount maneuverability. Includes a zippered storage case with strap and a photo adapter tube for camera lens attachment capability.

VESA MOUNT ADAPTER & FLUSH WALL MOUNT $99.99 VESA MOUNT ADAPTER & FLUSH WALL MOUNT

Aluminum Alloy Scope Mount Base for AK Series Gun S8609 $8.45 - Aluminum alloy material - Items include scope mount + hex wrench - Fit for AK series gun - Package Included: 1 x Scope Mount Base for AK Series Gun ?

wall plate mount adapter $51.99 HP - Wall plate mount adapter - for TouchSmart 9100

Ceiling Mount Adapter $21.99 SANUS CEILING MOUNT ADAPTER W OFFSET NIC

Burris Ar Pepr 30Mm Scope Mount 410341 $76.29 Burris 30MM Matte Black Scope Mounts Md: 410341, Proper Eye Position Ready for combat riflescopes, this mount provides 2 inches of forward scope positioning. Ring bases are milled as a single, tough unit and ring tops feature Picatinny tops for mounting additional accessories. Available for 30MM or 1 inch scopes., Type: Scope Mount MFG/Model: AR Proper Eye Position Ready Style: Picatinny Misc: 30MM Finish: Matte Black, Manufacturer: BURRIS COMPANY, Model: 410341. Type: Gun Scopes

Professional GL-4*32C Rifle Scope with Gun Mount $97.3 - 4x32 type scope- Superior optical glass- Fixed 4x zoom- With vertically and horizontally adjustable targeting cross- QR mount allows fast removal of the scope from RIS rail- Extra external sights gives chance to aim without magnification- Compatible with M40/M4A1 and so on- Package included:- 1 * Riflescope- 1 * Mount- 1 * Cleaning cloth

Apple Vesa Mount Adapter Kit $39 Apple Vesa Mount Adapter Kit