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Beginning in 2000, Edmund Optics offered a variety of experimental grade and stock clearance items via a print catalog and online under a separate business named Anchor Optics, but this operation ceased in 2016, and the current Anchor Optics web site now redirects to a page at Edmund Optics listing clearance items. [5]
When Edmund Scientific introduced the telescope in 1976 they called it "The Edmund Wide-Field Telescope" with a Part Number "2001" [5] Edmund had a public contest which ran until November 15, 1976, to come up with a name. [6] The winning name was "Astroscan 2001". The "2001" part of the name was dropped over time.
Edmund Astronomy News (March 1978) called the eyepiece the "Rank-Kaspereit-Erfle" (RKE) a "redesign[ed] ... type II Kellner". [16] However, the RKE deign does not resemble a Kellner, and is closer to a modified König. There is some speculation that at some point the "K" was mistakenly interpreted as the name of the more common Kellner, instead ...
Zemax is a software program used for designing and simulating optical systems. It is widely used in the field of optics and photonics for designing and analyzing the performance of lenses, cameras, telescopes, microscopes, and other optical systems. With the software, the behavior of light interacting with various optical components can be ...
A USAF 1951 resolution chart in PDF format is provided by Yoshihiko Takinami. This chart should be printed such that the side of the square of the 1st element of the group -2 should be 10 mm long. USAF 1951 Resolution Target Further explanations and examples; Koren 2003: Norman Koren's updated resolution chart better suited for computer analysis
This can be a letter-number code, as used in the Schott Glass catalogue, or a 6 digit glass code. Glasses' Abbe numbers, along with their mean refractive indices, are used in the calculation of the required refractive powers of the elements of achromatic lenses in order to cancel chromatic aberration to first order.
Diagram illustrating the flange focal length of an SLR–type and a mirrorless–type camera. For an interchangeable lens camera, the flange focal distance (FFD) (also known as the flange-to-film distance, flange focal depth, flange back distance (FBD), flange focal length (FFL), back focus [1] or register, depending on the usage and source) of a lens mount system is the distance from the ...
Direct surface surveying (no intervening optics, for example Foucault knife-edge test, Ronchi test, Caustic test) Auxiliary optics (null correctors, computer-generated holograms, etc.) Interferometric testing; The Fizeau interferometer is the standard type of interferometer that is used in optical fabrication. [12]