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Tilt–shift photography is the use of camera movements on small- and medium-format cameras, and sometimes specifically refers to the use of tilt for selective focus, often for simulating a miniature scene.
Sometimes the term is used when the large depth of field is simulated with digital post-processing; the name may derive from a perspective control lens (or tilt–shift lens) normally required when the effect is produced optically.
Tilt is used to control the orientation of the plane of focus (PoF), and hence the part of an image that appears sharp; it makes use of the Scheimpflug principle. Shift is used to adjust the position of the subject in the image area without moving the camera back; this is often helpful in avoiding the convergence of parallel lines, as when photographing tall buildings.
- 1 History and use
- 2 Perspective control lenses
- 3 Camera movements
- 4 Applying camera movements
- 5 Selective focus
- 6 Applications
- 7 Perspective control in software
- 8 Gallery of perspective control lenses
- 9 See also
- 10 References
- 11 Further reading
- 12 External links
History and use
Movements have been available on view cameras since the early days of photography; they have been available on smaller-format cameras since the early 1960s, usually by means of special lenses or adapters. Nikon introduced a lens providing shift movements for their 35 mm SLR cameras in 1962, and Canon introduced a lens that provided both tilt and shift movements in 1973; many other manufacturers soon followed suit. Canon currently offers four lenses that provide both movements while Nikon offers three. Such lenses are frequently used in architectural photography to control perspective, and in landscape photography to get an entire scene sharp.
Some photographers have popularized the use of tilt for selective focus in applications such as portrait photography. The selective focus that can be achieved by tilting the plane of focus is often compelling because the effect is different from that to which many viewers have become accustomed. Ben Thomas, Walter Iooss Jr. of Sports Illustrated, Vincent Laforet and many other photographers have used this technique.
Perspective control lenses
|(a) Keeping the camera level, with an ordinary lens, captures only the bottom portion of the building.|
|(b) Tilting the camera upwards results in vertical perspective.|
|(c) Shifting the lens upwards results in a picture of the entire subject.|
In photography, a perspective control lens allows the photographer to control the appearance of perspective in the image; the lens can be moved parallel to the film or sensor, providing the equivalent of corresponding view camera movements. This movement of the lens allows adjusting the position of the subject in the image area without moving the camera back; it is often used to avoid convergence of parallel lines, such as when photographing a tall building. A lens that provides only shift is called a shift lens, while those that can also tilt are called tilt-shift lenses. The terms PC and TS are also used by some manufacturers to refer to this type of lens.
Short-focus perspective-control (PC) lenses (i.e., 17 mm through 35 mm) are used mostly in architectural photography; longer focal lengths may also be used in other applications such as landscape, product, and closeup photography. PC lenses are generally designed for single-lens reflex (SLR) cameras, as rangefinder cameras do not allow the photographer to directly view the effect of the lens, and view cameras allow for perspective control using camera movements.
A PC lens has a larger image circle than is required to cover the image area (film or sensor size). Typically, the image circle is large enough, and the mechanics of the lens sufficiently limited, that the image area cannot be shifted outside of the image circle. However, many PC lenses require a small aperture setting to prevent vignetting when significant shifts are employed. PC lenses for 35 mm cameras typically offer a maximum shift of 11 mm; some newer models offer a maximum shift of 12 mm.
The mathematics involved in tilt lenses are described as the Scheimpflug principle, after an Austrian military officer who developed the technique for correcting distortion in aerial photographs.
The first PC lens manufactured for an SLR camera in any format was Nikon’s 1961 f/3.5 35 mm PC-Nikkor; it was followed by an f/2.8 35 mm PC-Nikkor (1968), an f/4 28 mm PC-Nikkor (1975), and an f/3.5 28 mm PC-Nikkor (1981). In 1973, Canon introduced a lens, the TS 35 mm f/2.8 SSC, with tilt as well as shift functions.
Other manufacturers, including Olympus, Pentax, Schneider Kreuznach (produced as well for Leica), and Minolta, made their own versions of PC lenses. Olympus produced 35 mm and 24 mm shift lenses. Canon currently offers 17 mm, 24 mm, 45 mm, and 90 mm tilt/shift lenses. Nikon currently offers 19 mm, 24 mm, 45 mm, and 85 mm PC lenses with tilt and shift capability.
When the camera back is parallel to a planar subject (such as the front of a building), all points in the subject are at the same distance from the camera, and are recorded at the same magnification. The shape of the subject is recorded without distortion. When the image plane is not parallel to the subject, as when pointing the camera up at a tall building, parts of the subject are at varying distances from the camera; the more distant parts are recorded at lesser magnification, causing the convergence of parallel lines. Because the subject is at an angle to the camera, it is also foreshortened.
When the camera back is not parallel to a planar subject, it is not possible to have the entire subject in focus without the use of tilt or swing; consequently, the image must rely on the depth of field to have the entire subject rendered acceptably sharp.
With a PC lens, the camera back can be kept parallel to the subject while the lens is moved to achieve the desired positioning of the subject in the image area. All points in the subject remain at the same distance from the camera, and the subject shape is preserved. If desired, the camera back can be rotated away from parallel to the subject, to allow some convergence of parallel lines or even to increase the convergence. Again, the position of the subject in the image area is adjusted by moving the lens.
The earliest perspective control and tilt/shift lenses for 35 mm format were 35 mm focal length, which is now considered too long for many architectural photography applications. With advances in optical design, lenses of 28 mm and then 24 mm became available and were quickly adopted by photographers working in close proximity to their subjects, such as in urban settings.
The Arri motion-picture camera company offers a shift and tilt bellows system that provides movements for PL-mount lenses on motion-picture cameras.
Canon currently offers four lenses with tilt and shift functions: the TS-E 17 mm f/4, the TS-E 24 mm f/3.5L II, the TS-E 45 mm f/2.8, and the TS-E 90 mm f/2.8. On the 45 mm and 90 mm lenses, the mechanisms providing the tilt and shift functions can be rotated 90° to the left or right so that they operate horizontally, vertically, or at intermediate orientations. The lenses are supplied with the tilt and shift movements at right angles to each other; they can be modified so that the movements operate in the same direction.
The 17 mm and the 24 mm version II lenses allow independent rotation of the tilt and shift movements. The 90 mm lens gives 0.29 magnification, making it usable for moderate close-up work. All four lenses provide automatic aperture control.
Hartblei makes tilt-and-shift lenses to fit various manufacturers’ camera bodies. It currently offers four Super-Rotator Tilt/Shift lenses for 35 mm bodies: the TS-PC Hartblei 35 mm f/2.8, the TS-PC Hartblei 65 mm f/3.5, the TS-PC Hartblei 80 mm f/2.8, and the TS-PC Hartblei 120 mm f/2.8. It also offers the TS-PC Hartblei 45 mm f/3.5 to fit several medium-format camera bodies. The tilt and shift movements can be independently rotated in any direction.
Hasselblad offers a tilt-and-shift adapter, the HTS 1.5, for use with the HCD 28 mm f/4, HC 35 mm f/3.5, HC 50 mm f/3.5, HC 80 mm f/2.8 and HC 100 mm f/2.2 lenses on H-System cameras. To allow infinity focus, the adapter includes optics that multiply the lens focal lengths by 1.5. Autofocus and focus confirmation are disabled when using the adapter.
In 2008, Leica introduced a 30 mm tilt-and-shift lens for its new S-System of digital SLRs.
Minolta offered the 35mm f/2.8 Shift CA lens for its manual focus SR-mount cameras in the 1970s and 1980s. The lens was unique among perspective control lenses in that, rather than offering a combination of tilt-and-shift, Minolta designed the lens with variable field curvature, which could make the field of focus either convex or concave (essentially a three-dimensional, spherical form of tilt).
Nikon offers several PC lenses, all of which feature tilt and shift functions: a new (Oct. 2016) PC-E Nikkor 19mm f/4.0 ED lens, a PC-E Nikkor 24 mm f/3.5D ED lens, PC-E Micro-Nikkor 45 mm f/2.8D ED, and PC-E Micro Nikkor 85 mm f/2.8D ED. The 45 mm and 85 mm “Micro” lenses offer close focus (0.5 magnification) for macrophotography. In 2016, Nikon added the PC NIKKOR 19mm f/4E ED extra wide angle view lens with a magnification factor of 0.18 and 25 cm focus distance. The PC-E lenses offer automatic aperture control with the Nikon D3, D300, and D700 cameras. With some earlier camera models, a PC-E lens operates like a regular Nikon PC (non-E) lens, with preset aperture control by means of a pushbutton; with other earlier models, no aperture control is provided, and the lens is not usable.
The mechanisms providing the tilt and shift functions can be rotated 90° to the left or right so that they operate horizontally, vertically, or at intermediate orientations. The lenses are supplied with the tilt and shift movements at right angles to each other; they can be modified by Nikon so that the movements operate in the same direction.
In Pentax high-end DSLRs (K-7, K-5, K-5 II, K-5 IIs and K-30) the shake reduction hardware unit can be manually adjusted in the X/Y direction to achieve a shift effect with any lens using the Composition Adjust function in the menu system. Although available for any lens that fits the camera body, this adjustment can not fully replace regular shift lenses as those may provide a larger shift movement.
Schneider-Kreuznach offers the PC-Super Angulon 28 mm f/2.8 lens that provides shift movements, with preset aperture control. The lens is available with mounts to fit cameras by various manufacturers, and also with 42 mm screw mount.
The Sinar arTec camera offers tilt and shift with the full range of Sinaron digital lenses.
All perspective control and tilt/shift lenses are manual-focus prime lenses; most are quite expensive compared to regular prime lenses. Some medium format camera makers, such as Mamiya, have addressed this problem by offering shift adapters that work with the maker’s other prime lenses.
ARAX introduced a 35 mm f/2.8 and an 80 mm f/2.8 tilt shift lens, which are available for several camera mounts. Both lenses retail for less than the Samyang T-S 24mm. ARAX also produces a 50 mm f/2.8 tilt shift lens for Micro 4/3 and Sony NEX mounts.
Most SLR cameras provide automatic aperture control, which allows viewing and metering at the lens’s maximum aperture, stops the lens down to the working aperture during exposure, and returns the lens to maximum aperture after exposure. For perspective-control and tilt/shift lenses, the mechanical linkage is impractical, and automatic aperture control was not offered on the first such lenses. Many PC and TS lenses incorporated a feature known as a “preset” aperture, which lets the photographer set the lens to working aperture, and then quickly switch between working aperture and full aperture without looking at the aperture control. Though slightly easier than stopped-down metering, operation is less convenient than automatic operation.
When Canon introduced its EOS line of cameras in 1987, the EF lenses incorporated electromagnetic diaphragms, eliminating the need for a mechanical linkage between the camera and the diaphragm. Because of this, the Canon TS-E tilt/shift lenses include automatic aperture control.
In 2008, Nikon introduced its PC-E perspective-control lenses with electromagnetic diaphragms. Automatic aperture control is provided with the D300, D500, D600/610, D700, D750, D800/810, D3, D4 and D5 cameras. With some earlier cameras, the lenses offer preset aperture control by means of a pushbutton that controls the electromagnetic diaphragm; with other earlier cameras, no aperture control is provided, and the lenses are not usable.
A camera lens can provide sharp focus on only a single plane. Without tilt, the image plane (containing the film or image sensor), the lens plane, and the plane of focus are parallel, and are perpendicular to the lens axis; objects in sharp focus are all at the same distance from the camera. When the lens plane is tilted relative to the image plane, the plane of focus (PoF) is at an angle to the image plane, and objects at different distances from the camera can all be sharply focused if they lie in the same plane. With the lens tilted, the image plane, lens plane, and PoF intersect at a common line; this behavior has become known as the Scheimpflug principle. When focus is adjusted with a tilted lens, the PoF rotates about an axis at the intersection of the lens's front focal plane and a plane through the center of the lens parallel to the image plane; the tilt determines the distance from the axis of rotation to the center of the lens, and the focus determines the angle of the PoF with the image plane. In combination, the tilt and focus determine the position of the PoF.
In applications such as landscape photography, getting everything sharp is often the objective; by using tilt, both the foreground and background can often be made sharp without the use of a large f-number. When the PoF coincides with an essentially flat subject, the entire subject is in focus; for a subject that is not flat, obtaining foreground and background sharpness relies on the depth of field, though the sharpness can often be obtained with a smaller f-number than would be needed without the use of tilt. Basically, this shifts the whole plane of focus keeping one of the three axes as it is.
The PoF can also be oriented so that only a small part of it passes through the subject, producing a very shallow region of sharpness, and the effect is quite different from that obtained simply by using a large aperture with a regular camera.
Using tilt changes the shape of the depth of field (DoF). When the lens and image planes are parallel, the DoF extends between parallel planes on either side of the PoF. With tilt or swing, the DoF is wedge shaped, with the apex of the wedge near the camera, as shown in Figure 5 in the Scheimpflug principle article. The DoF is zero at the apex, remains shallow at the edge of the lens's field of view, and increases with distance from the camera. For a given position of the PoF, the angle between the planes that define the near and far limits of DoF (i.e., the angular DoF) increases with lens f-number; for a given f-number and angle of the PoF, the angular DoF decreases with increasing tilt. When it is desired to have an entire scene sharp, as in landscape photography, the best results are often achieved with a relatively small amount of tilt. When the objective is selective focus, a large amount of tilt can be used to give a very small angular DoF; however, the tilt fixes the position of the PoF rotation axis, so if tilt is used to control the DoF, it may not be possible to also have the PoF pass through all desired points.
View camera users usually distinguish between rotating the lens about a horizontal axis (tilt), and rotation about a vertical axis (swing); small- and medium-format camera users often refer to either rotation as "tilt".
If a subject plane is parallel to the image plane, parallel lines in the subject remain parallel in the image. If the image plane is not parallel to the subject, as when pointing a camera up to photograph a tall building, parallel lines converge, and the result sometimes appears unnatural, such as a building that appears to be leaning backwards.
Shift is a displacement of the lens parallel to the image plane that allows adjusting the position of the subject in the image area without changing the camera angle; in effect the camera can be aimed with the shift movement. Shift can be used to keep the image plane (and thus focus) parallel to the subject; it can be used to photograph a tall building while keeping the sides of the building parallel. The lens can also be shifted in the opposite direction and the camera tilted up to accentuate the convergence for artistic effect.
Shifting a lens allows different portions of the image circle to be cast onto the image plane, similar to cropping an area along the edge of an image.
Again, view camera users usually distinguish between vertical movements (rise and fall) and lateral movements (shift or cross), while small- and medium-format users often refer to both types of movements as "shift".
Lens image circle
Whereas the image circle of a standard lens usually just covers the image frame, a lens that provides tilt or shift must allow for displacement of the lens axis from the center of the image frame, and consequently requires a larger image circle than a standard lens of the same focal length.
Applying camera movements
On a view camera, the tilt and shift movements are inherent in the camera, and many view cameras allow a considerable range of adjustment of both the lens and the camera back. Applying movements on a small- or medium-format camera usually requires a tilt–shift lens or perspective control lens. The former allows tilt, shift, or both; the latter allows only shift. With a tilt–shift lens, adjustments are available only for the lens, and the range is usually more limited.
Tilt–shift and perspective-control lenses are available for many SLR cameras, but most are far more expensive than comparable lenses without movements. The Lensbaby SLR lens is a low-cost alternative for providing tilt and swing for many SLR cameras, although the effect is somewhat different from that of the lenses just described. Because of the simple optical design, there is significant curvature of field, and sharp focus is limited to a region near the lens axis. Consequently, the Lensbaby's primary application is selective focus and toy camera–style photography.
Selective focus can be used to direct the viewer's attention to a small part of the image while de-emphasizing other parts.
With tilt, the effect is different from that obtained by using a large f-number without tilt. With a regular camera, the PoF and the DoF are perpendicular to the line of sight; with tilt, the PoF can be almost parallel to the line of sight, and the DoF can be very narrow but extend to infinity. Thus parts of a scene at greatly different distances from the camera can be rendered sharp, and selective focus can be given to different parts of a scene at the same distance from the camera.
With tilt, the depth of field is wedge shaped. As noted above, using a large amount of tilt and a small f-number gives a small angular DoF. This can be useful if the objective is to provide selective focus to different objects at essentially the same distance from the camera. But in many cases, effective use of tilt for selective focus requires a careful choice of what is sharp as well as what is unsharp, as Vincent Laforet has noted. Because the tilt also affects the position of the PoF, it may not be possible to use a large amount of tilt and have the PoF pass through all desired points. This may not be a problem if only one point is to be sharp; for example, if it is desired to emphasize one building in a row of buildings, the tilt and f-number can be used to control the width of the sharp area, and the focus used to determine which building is sharp. But if it is desired to have two or more points sharp (for example, two people at different distances from the camera), the PoF must include both points, and it usually is not possible to achieve this while also using the tilt to control DoF.
Selective focus using tilt appears in motion pictures such as Minority Report, (2002). Director of photography Janusz Kamiński says he prefers using tilt–shift lenses to digital post-production as too much digital can detract and "It doesn’t look organic."
Basic digital post-processing techniques can give results similar to those achieved with tilt, and afford greater flexibility and control, such as choosing the region that is sharp and the amount of blur for the unsharp regions. Moreover, these choices can be made after the photograph is taken. One advanced technique, Smallgantics, is used for motion-pictures; it was first seen in the 2006 Thom Yorke music video "Harrowdown Hill", directed by Chel White. Artist Olivo Barbieri is well known for his miniature-faking skills in the 1990s. Artist Ben Thomas's series Cityshrinker extended this concept to miniature faking major cities around the world, his book Tiny Tokyo: The Big City Made Mini (Chronicle Books, 2014), depicts Tokyo in miniature.
When making photographs of a building or other large structure from the ground, it is often impossible (without shift) to fit the entire building in the frame without tilting the camera upwards. The resultant perspective causes the top of the building to appear smaller than its base, which is often considered undesirable (b). The perspective effect is proportional to the lens’s angle of view.
Photographing from the ground, perspective can be eliminated by keeping the film plane parallel to the building. With ordinary lenses, this results in capturing only the bottom part of the subject (a). With a perspective control lens, however, the lens may be shifted upwards in relation to the image area, placing more of the subject within the frame (c). The ground level, the camera’s point of perspective, is shifted towards the bottom of the frame.
Another use of shifting is in taking pictures of a mirror. By moving the camera off to one side of the mirror, and shifting the lens in the opposite direction, an image of the mirror can be captured without the reflection of the camera or photographer. Shifting can similarly be used to photograph “around” an object, such as a building support in a gallery, without producing an obviously oblique view.
Perspective control in software
Computer software (such as Photoshop's perspective and distort functions) can be used to control perspective effects in post-production. However, this technique does not allow the recovery of lost resolution in the more distant areas of the subject, or the recovery of lost depth of field due to the angle of the film/sensor plane to the subject. Areas of the image enlarged by these digital techniques may suffer from the visual effects of pixel interpolation, depending on the original image resolution, degree of manipulation, print/display size, and viewing distance.
The effect of using tilt or swing movements is less easily accomplished in post-production. If every part of the image is within the depth of field, it is fairly easy to simulate the effect of shallow depth of field that could be achieved by using tilt or swing; however, if the image has a finite depth of field, post-production cannot simulate the sharpness that could be achieved by using tilt or swing to maximize the region of sharpness.
Gallery of perspective control lenses
Olympus 24 mm f/3.5 Zuiko-Shift. 10 mm maximum shift. Mounted on an Olympus camera.
35 mm f/2.8 PC-Nikkor. 11 mm maximum shift.
Arax 35 mm f/2.8 TS mounted on a Canon EOS 40D. Fully tilted.
Minolta 35 mm f/2.8 shift. 11 mm maximum shift.
Pentax Shift 28 mm f/2.8 SMC lens.
Pentax-mount Arax 35 mm f/2.8 TS at max tilt and no shift.
- Tilted plane focus
- The Brenizer Method
- Canon TS-E 24mm lens
- PC-E Nikkor 24mm f/3.5D ED Lens
- Lensbaby, another type of movable lens
- View camera, a camera type that allows tilt and/or shift control.
- Sato, Haruo. "Tale Seventeen : PC-Nikkor 28 mm f/4". Nikon Corporation. Retrieved 2008-07-10.
- Canon TS 35 mm f/2.8 SSC lens. Canon Camera Museum. Retrieved on 2008-07-10.
- "Tale Seventeen : PC-Nikkor 28 mm f/4". Nikon Corporation.
- Canon TS 35 mm f/2.8 SSC lens. Canon Camera Museum
- Ray 2000, 171.
- Ray 2000, 172.
- PC-E Nikkor 24 mm f/3.5D ED User's Manual , 7MAA49C2-02, p. 21. Nikon Corporation.
- "Pentax K-5 User's Manual", p. 220, Pentax Ricoh Imaging Corporation.
- "Samyang T-S 24mm f/3.5 ED AS UMC Lens Review". Retrieved November 23, 2013.
- Stroebel, Leslie (1976). View Camera Technique (3rd ed.). London: Focal Press. p. 28. ISBN 0-240-50901-3.
- Wilson, Andrew (May 1, 2006). "Shift/tilt lenses bring new perspectives". Vision Systems Design. Retrieved 2008-05-19.
- "Tilt–shift working", "cow.mooh.org", Page contents copyright (c) Bhautik Joshi, 2010.
- Bond, Howard (May–June 1998). "Setting Up the View Camera". Photo Techniques: 41–45. A transcription is available on the Large Format Page.
- Lensbaby web site FAQ, "Is the Lensbaby like a tilt–shift lens?"
- Stroebel, 1976
- "Interview: Vincent Laforet". Canon USA, Inc. Retrieved 2010-04-06.
- Kaminski, Janusz (2010-04-02). "Janusz Kaminski on The Diving Bell and the Butterfly". MovieMaker. Retrieved 2010-04-02..
- Segal, David (2007-02-07). "Can Photographers Be Plagiarists?". Slate. Retrieved 2007-02-07.
- Rodrigues, Vailancio (2008-11-16). "50 Beautiful Examples of Tilt–Shift Photography". Smashing Magazine. Retrieved 2008-11-19.
- Baryshnikov, Evgeniy (2012-01-10). "More than 60 Examples of miniature faking Photography created using Tilt-Shift Generator software". Retrieved 2012-05-06.
- Held, R. T.; Cooper, E. A.; O'Brien, J. F.; Banks, M. S. (March 2010). "Using blur to affect perceived distance and size" (PDF). ACM Transactions on Graphics. 29 (2): 19:11–19:11. doi:10.1145/1731047.1731057. ISSN 0730-0301. Retrieved 2012-02-23.
- "TiltShift Effect Generator". FaceGarage. 2014-11-30. Retrieved 2014-11-30.
- Fergusson, WM (9 December 2007). "Fake Tilt-Shift Photography". NY times. Retrieved November 2014. Check date values in:
- Thomas, Ben (2014-04-10). "Tiny Tokyo; The Big City Made Mini". Retrieved 2014-05-09.
- Held, R. T.; Cooper, E. A.; O'Brien, J. F.; Banks, M. S. (March 2010). "Using blur to affect perceived distance and size" (PDF). ACM Transactions on Graphics. 29 (2): 19:11–19:11. doi:10.1145/1731047.1731057. ISSN 0730-0301. Retrieved 2012-02-23.
- Ray, Sidney F. 2000. The geometry of image formation. In The Manual of Photography: Photographic and Digital Imaging, 9th ed. Ed. Ralph E. Jacobson, Sidney F. Ray, Geoffrey G. Atteridge, and Norman R. Axford. Oxford: Focal Press. ISBN 0-240-51574-9
|Wikimedia Commons has media related to Tilt–shift photography.|
- Major Cities of the World in tilt shift by Ben Thomas, project Cityshrinker
- A Really Big Show—slideshow of photos by Vincent Laforet with commentaries (requires Flash)
- About Canon's Tilt Shift Lens—Utilizing the shift feature on a Canon wide-angle tilt–shift lens.
- Tilt–Shift Software Photoscape Tutorial—Simple Photoscape tutorial to stimulate fake tilt–shift effects
- Examples of Tilt-Shift Photography
- Uniqlo Calendar - Timelapse tilt-shift footage around various places in Japan set to upbeat music (requires Adobe Flash).
- What is perspective correction?
- How Shift Lenses Change your Life
- History of the PC-Nikkor lens
- Instruction manual for 35 mm PC-Nikkor lens
- Perspective Control (Shift Lenses) in Architectural Photography
- Perspective Control (Tilt/Shift range) Architectural View Camera
- Using the 35 mm Perspective Control Lens
- Dictionary of Film and Photography: Perspective control (PC) lens
- Using a perspective control lens (shift lens)
- Tutorial: Perspective Control Lenses
- Tilt-Shift lens selection and difference
- Perspective Correction Using Software
- Page of Links to Galleries and Information on Tilt-Shift Photography and Lenses
- Sinar arTec camera with tilt and shift
- Rokinon 24 mm shift lens