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The artisan activity commenced at an unknown date during Spinoza's early phase at Amsterdam, during the 1650s. He appears to have been quite skilled in lens-grinding by the time he moved to Rijnsburg in 1661.
Scientific American's THE AMATEUR SCIENTIST Index A Complete Index to "The Amateur Scientist" Edited by C. L. Stong April 1952 to June 1978 A Service of the
Stellafane External Links provide links to related information on Amateur Telescope Making, Mirror Making, Optics, other Astronomy clubs and local area links to the Springfield, Vermont area.
This a nice little receiver and works well for vlf. Nice article
The repair and care of Vintage Costume Jewelry
As for buying a real telescope, here's my advice: Aperture The most important factor in a telescope's ability to detect anything is its aperture-- the diameter of the primary mirror (reflector) or objective lens (refractor).
David Harbour presents an easy to understand overview of the Foucault Test used to evaluate the performance of telescope mirrors.
the geometry of color perception. The previous pages have explained three very different methods for defining a color: (1) the measurement of the color stimulus as a spectral emittance or reflectance curve in colorimetry; (2) the proportional responses to the stimulus by the L, M and S cones, represented as a chromaticity diagram; and (3) the ...
Katie Scootering. Nikon D5 at 1/1,000, 1/1,250 and 1/1,600 at 12 FPS at Auto ISO 100, Nikon 80-200mm AF-S at f/2.8 at 105mm, 86mm and 80mm. Click any for the camera-original full-resolution files to explore on your computer.
Nikon Lens Compatibility. Nikon System Compatibility . March 2017 Nikon Reviews Nikon Lenses All Reviews. Introduction. Nikon is the leader when it comes to compatibility among cameras and lenses of different decades.
By Chuck Hawks. For many years I was a camera store manager and professional photographer. Later I became a photography teacher. In the course of pursuing those careers, and because I was interested, I came to have a better than average understanding of optics and lens systems.
This page introduces the optical principles necessary to understand the design and performance of astronomical telescope systems — the telescope and eyepiece used as a visual instrument with the eye included as a third component.
Microscope: Microscope, instrument that produces enlarged images of small objects, allowing the observer an exceedingly close view of minute structures at a scale convenient for examination and analysis.
Schmidt–Cassegrain telescopes are one of the most popular commercial designs on the amateur astronomical market, having been mass-produced since the 1960s. The design replaces the Schmidt Camera film holder with a Cassegrain secondary mirror, making a folded optical path with a long focal length and a narrow field of view.
Several men laid claim to inventing the telescope, but the credit usually goes to Hans Lippershey, a Dutch lensmaker, in 1608. Galileo Galilei improved on Lippershey's design and was the first to point a telescope toward the sky.
11. SOLDERING - . Step one is to have the proper soldering iron, solder and technique. The soldering iron's tip size and wattage should match the size of the job.
The camera lens is an invention that attempts to duplicate the operation of the human eye. Just like the eye, the lens sees an image, focuses it, and transmits its colors, sharpness, and brightness through the camera to the photographic film, which, like our memory, records the image for processing ...
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The Fresnel lens reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections.
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Telescope telescope construction and building making amateur dobsonian kits ATM Accessories parts telescopes spares equipment sales astronomy information, tips.
Preparation before grinding. Throw rough grit around the rim of the mirror, wet it down, grab a piece of metal, and grind in a nice rounded bevel 1/12" wide.
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