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Topic: Scheimpflug principle

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Critical focus

View camera

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	Scheimpflug principle - Wikipedia, the free encyclopedia
		The Scheimpflug principle is named after Austrian Captain Theodor Scheimpflug and deals with the change of the focus plane when tilting the front standard of a view camera.
		When an oblique tangent is extended from the film plane, and another is extended from the lens plane, they meet at a point.
		Scheimpflug references the concept in his 1904 British patent GB1196/1904.
	en.wikipedia.org /wiki/Scheimpflug_principle (164 words)

	scheimpflug (Site not responding. Last check: 2007-10-14)
		A Scheimpflug imaging device is not necessary for a clinical diagnosis of cataracts or to indicate the necessity of a cataract operation.
		Scheimpflug image showing from left to right: the vitreous body, the lens (with an opacity in the posterior subcapsular region), the anterior chamber and the cornea.
		Contrary to Scheimpflug imaging in a conventional slit lamp examination one observes the eye more or less approaching along the optical axis and illuminating from the side at an angle between 20 and 80 degrees.
	www.columbia.edu /~akj19/scheimpflug.html (833 words)

	Omni-directional optical code reader using scheimpflug optics - Patent 6621063
		In a preferred configuration, the image sensor plane is tilted with respect to the lens (or lens with respect to the image sensor plane) according to the Scheimpflug principle.
		By tilting the image sensor array plane 103 in accordance with the Scheimpflug principle such that the lens plane 102, sensor plane 103 and object plane 104 all intersect at point 115, the entirety of object plane 114 is within the DOF.
		Alternatively, the lens plane 102 may be tilted relative to the sensor plane 103, and, once again, in accordance with the Scheimpflug principle the object plane 104, image sensor array plane 103, and lens plane 102 will intersect at the Scheimpflug point 115.
	www.freepatentsonline.com /6621063.html (8498 words)

	Scheimpflug tilt adapter - Camera / lens mount for off-normal focus correction (Site not responding. Last check: 2007-10-14)
		Scheimpflug tilt adapters allow the lens to be tilted in a controlled way.
		In 1904 Theodor Scheimpflug, patented several special cameras for correcting the undesired distortion in photographs taken from balloons when the camera was not pointing straight down.
		A second condition similar to Scheimpflugâs Principle, also described in Scheimpflugâs patent, states that there is another set of three planes that must converge along a common line.
	www.oxfordlasers.com /datasheets/scheimpflug_tilt_adapter.htm (361 words)

	photo.net Forum: Scheimpflug principle quantified, anyone?
		Scheimpflug now tells you that the focal plane will have to intersect with the other two planes along the same line.
		Like the Scheimpflug Principle, the Hinge Rule asserts that three planes intersect in one line: The focal plane, the plane parallel to the aperture plane which is one focal length in front of the lens, and the plane parallel to the film plane which goes through the center of the lens.
		The Scheimpflug Principle (focal plane, aperture plane, and film plane intersect in one line) and the the Hinge Rule together allow it to determine the focal plane from the focal length of the lense, the film plane, and the aperture plane.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=004HFT (3293 words)

	«Honorific» «FirstName» «Lastname»
		The official name of the Association is “Scheimpflug - Club, for the promotion of cataract assessment modalities and epidemiology”, hereinafter referred to as the “Scheimpflug - club”, organization number 80 24 07-6930.
		The technical development of the necessary equipment, the methods of application and the procedures for obtaining hard data for lens transparency or opacification respectively around 1980 lead to a new approach in experimental and clinical cataract research.
		In the last years the application to clinical and epidemiological problems of cataract research more and more moved into the foreground, but still the slit image documentation according to Scheimpflug’s principle with its many evaluation procedures remained the basis of these meetings.
	www.ste.ki.se /scheimpflug/club/constitution.html (1396 words)

	Omni-directional optical code reader using scheimpflug optics - Patent 6963074
		The tilt angle α, lens focal length, aperture setting, and imaging array resolution may be selected to obtain the desired characteristics of depth-of-field and scan line width at a certain distance from the lens system 412.
		Each image sensor array 713a and 713b is arranged at an angle with respect to lens system 712 in accordance with the Scheimpf lug principle so that the DOF of each image sensor array 713a, 713b is improved.
		By tilting an image sensor arrays 1104a, 1104b, 1104c in accordance with the Scheimpflug principle, the optical code reader provides a preferred DOF to read optical codes oriented in the same direction of the imaging sensor array.
	www.freepatentsonline.com /6963074.html (8510 words)

	PUBLISHING HOUSE SB RAS
		Two basic schemes of laser triangulation sensors used for sensing a mirror surface are analyzed: the first one uses sensors with the photo-registration plane tilted to the optic axis according to the Scheimpflug principle, and the other uses sensors with the plane that is orthogonal to the optic axis.
		The conditions of Scheimpflug principle applicability are determined.
		It is shown that for a certain ratio of parameters of the optical system to probing light beam, the scheme with an orthogonal registration plane can ensure a smaller level of measurement errors than the scheme with a tilted output plane, despite the presence of defocusing.
	www-sbras.nsc.ru /PSB/show_text.phtml?eng+5365+9 (162 words)

	Scheimpflug Principle technique for close-up work - Large Format Photography Forum
		Don't know if there's a better method than checking on the ground glass after setting your tilts etc. Part of your trouble is the fact that you're doing macro work and the bellows are extended quite a bit.
		This means that it takes a lot of tilt before you establish a Scheimpflug a couple of feet or so off the ground.
		The problem is magnified by the fact that you're working very close to the subject, which means tilts change your framing a good bit more than normal.
	www.largeformatphotography.info /forum/showthread.php?t=1461 (662 words)

	Theodor Scheimpflug - Wikipedia, the free encyclopedia
		Theodore Scheimplug was an Austrian Captain best known for his contributions to photography, most notably the eponnymous Scheimpflug principle.
		Best known for his discovery of the Scheimpflug principle, which deals with the area of critical focus in a view camera, although there is some argument over whether he was actually the first to describe this principle.
		In fact, he himself did not claim credit for its discovery, but he did elaborate a great deal on the previous knowledge
	en.wikipedia.org /wiki/Theodor_Scheimpflug (124 words)

	Delaware Camera Club - The Reflector Online
		The Scheimpflug technique increases the depth-of-field by tilting the lens.
		When photographing a flat field at an angle to the camera, for example leaves on the ground, one can visualize three planes: The plane formed by the subject being photographed, the film plane, and the plane formed by the front of the lens.
		The Scheimpflug principle states that the maximum depth-of-field is achieved when the three planes meet at a common point.
	www.delawarecameraclub.org /reflector/mar02/faq.html (725 words)

	Oculus USA: Ophthalmic Diagnostic Devices
		The Pentacam images the anterior segment of the eye by a rotating Scheimpflug camera measurement.
		Single scheimpflug images from various positions or 3D-scans of the anterior segment can be shown.
		The high quality of the Scheimpflug image allows pre- and post operative monitoring as in the case of an intraocular contact lens.
	www.oculususa.com /prd_comp.php (525 words)

	JCCC::PHOT 123 - Studio Photography
		Apply the Scheimpflug principle to alter the position of the focal plane to render a receding subject plane perfectly focused at maximum -- wide open -- lens aperture.
		Apply the Scheimpflug principle to alter the position of the wedge-shaped area of focus to render in total focus a subject that includes areas that deviate from the plane of focus.
		Alter the shape of the subject (perspective “correction”) using the back tilt or swing to neutralize the apparent convergence of parallel lines so the lines appear parallel in the print.
	www.jccc.net /home/course_outline/fall-2005/PHOT123 (1086 words)

	COMPARISON OF FOLDABLE POSTERIOR CHAMBER LENSES USING SCHEIMPFLUG PHOTOGRAPHY (Site not responding. Last check: 2007-10-14)
		Photography of the anterior eye segment according to Scheimpflug principle is well established for cataract research as an objective and reproducible method.
		And Scheimpflug photography is a sensitive tool to show any disturbances of transparency in PCIOL (eg after YAG capsulotomy).
		Method: We evaluated in a prospective study 15 pairs of eyes 6 months after implantation of the acrylic foldable lens AcrySof in one eye of each pair of eyes (MA 60 BM, Alcon) and the foldable silicone lens AMO Phaco Flex (Sl 40 NB, Allergan) in the other eye.
	www.dog.org /1998/e-abstract98/315.html (331 words)

	Optical Pachymetry - Ophthalmology Product Matrix - Medcompare
		Optical Pachymetry: The OCULUS Pachycam is a portable non-contact pachymeter based on the Scheimpflug principle.
		Features: Scheimpflug image: single pictures or 3-D scans of the anterior segment can be shown.
		Optical Pachymetry: Pachymetric measurements of the cornea are taken with the Scheimpflug camera and calculated from the
	www.medcompare.com /matrix.asp?catid=409 (159 words)

	Scheimpflug Principle and the Hinge Rule - Large Format Photography Forum
		Scheimpflug Principle and the Hinge Rule - Large Format Photography Forum
		With a 450, for most scenes, it is normal not to be able to get everything in focus.
		On the LF home page, there is a method that I recommend for finding the optimal f-stop, which does not require calculations, although it is based on sound optical principles.
	www.largeformatphotography.info /forum/showthread.php?t=4581 (2365 words)

	Canon 45 TSE- Mini Review - Canon Digital Photography Forums
		It is a very thick booklet and goes into some detail as far as the principles of tilt/shift photography.
		Petal hoods closely fit the lens coverage, but you hardly know where that's going to be on his, especially if tilt and shift are realigned.
		Scheimpflug principle in brief - tilt the lens so the focal plane extended, the subject's desired plane of focus, and a perpendicular to the lens axis all converge at the same point for maximum DoF.
	photography-on-the.net /forum/showthread.php?t=159736 (2046 words)

	[No title]
		I am not by nature a technical person and I believe that for the most part it is not important.
		While it may be intellectually interesting about things like hyperfocal distance and the Scheimpflug principle or the relative merits of different lenses, knowing these things will not make you a better photographer, just as knowing how an internal combustion engine works will not make you a better driver.
		In 1970 I taught a class at the Philadelphia College of Art (now, University of the Arts) called "Theory and Technique." Since I was a self-taught photographer, I knew virtually none of what I had been hired to teach before the semester began, though I had told them I did.
	www.michaelandpaula.com /mp/developerintro.html (2493 words)

	Detecting Progression of Nuclear Sclerosis by Using Human Grading Versus Semiautomated Computer Grading -- Klein et al. ...
		to the Scheimpflug principle—that is, the plane of the
		Scheimpflug photography of the anterior eye segment: principle, instrumentation and application to clinical and experimental ophthalmology.
		Chylack LT, Jr, McCarthy D, Khu P. Use of Topan SL-45 Scheimpflug slit photography to measure longitudinal growth of nuclear cataracts in vivo.
	www.iovs.org /cgi/content/full/46/4/1155 (4877 words)

	A newly developed peripheral anterior chamber depth analysis system: principle, accuracy, and reproducibility -- ... (Site not responding. Last check: 2007-10-14)
		A newly developed peripheral anterior chamber depth analysis system: principle, accuracy, and reproducibility -- Kashiwagi et al.
		Richards DW, Russell SR, Anderson DR. A method for improved biometry of the anterior chamber with a Scheimpflug technique.
		Anterior chamber angle biometry: a comparison of Scheimpflug photography and ultrasound biomicroscopy.
	bjo.bmjjournals.com /cgi/content/full/88/8/1030 (2808 words)

	Large format: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-14)
		Architectural and close-up photographers in particular benefit greatly from this ability.
		Based on the Scheimpflug principle Scheimpflug principle quick summary:
		The scheimpflug principle is named after austrian captain theodor scheimpflug and deals with the change of the focus plane when swinging the front standard of a...
	www.absoluteastronomy.com /enc1/large_format (1182 words)

	Omni-directional optical code reader using scheimpflug optics
		accordance with the Scheimpflug principle to allow for omni- directional
		Scheimpflug principle to allow for omni-directional reading with a preferred
		If you would like to purchase a copy of this patent, please call MicroPatent at 800-648-6787.
	www.tmcnet.com /usubmit/2006/Jan/1256954.htm (531 words)

	large format (Site not responding. Last check: 2007-10-14)
		Day 1 - Introduction to camera movements and the Scheimpflug principle.
		Assignment 1 - 4 sheets using swing and tilt.
		Assignment 5 - 8 sheets of art work.
	www.mlkstudios.com /classes/large_format.html (60 words)

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