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The lens aperture is the easiest way to control depth of field. The rule is simple: the smaller the aperture (that is, the bigger the f-number), the greater the ...

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Edmund Optics® (EO) is a leading producer of optics ... Barrington, NJ 08007-1331. United States ... Edmund Optics® (EO) is a leading producer of optics ...

The opportunities for single-vision aspheric lenses are relatively well known. Aspheric lenses improve the cosmetics of a pair of glasses by using surface curves that are flatter centrally and progressively flattened (in plus  prescriptions) as one moves from lens center to edge. The result is lenses that are thinner overall than the same prescription in standard spherical lenses with steeper curves. This thinning and flattening reduces the magnification of the wearer’s eyes as seen through the lens by others, as well as the world the wearer sees, and when specifically controlled ensures peripheral vision is optimized to be equal to or better than the peripheral vision in standard “best form” spherical design lenses.

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Power Technology infrared viewing devices are an excellent choice for observation of IR light emitted by sources like bulbs, LEDs and lasers.

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Dec 21, 2021 — Depth of field (DoF) is the area between the nearest and farthest points from the camera that are acceptably sharp in an image. A deep DoF means ...

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Enables user to attenuate light seen by the viewer’s detector surface. The accesory is for use with F1.4/26 mm and F1.6/26 mm lenses. The adjustable aperture allows a user to adjust the iris diameter between 2-20 mm and a thumb screw can be tightened to lock in the setting.

These lenses have two different amounts of asphericity on the same surface, located 90 degrees apart. Only a few manufacturers cast finished lenses with an atoric back surface (different asphericity in each meridian) and these have been typically limited to 1.67 high-index lenses. Another option is to free-form the back surface of the lens with the correct asphericity for each power, but this approach is as yet very limited in availability.

These adhesives are commonly used in the assembly and repair of optical systems such as lenses, prisms, and fiber optics. Unlike standard adhesives, optical ...

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This is an Android application to display, record and so on for a USB camera. No advertisement, and free. We have been maintaining it since Mar. 30, 2013 that ...

A unique and patented solution is to use the Double Aspheric lens from Augen Optics. It is available to your laboratory as a front surface, double aspheric, semi-finished lens blank in Trivex and 1.56 high-index. Your laboratory only needs to grind the back surface to create the prescription in the same way it now supplies any Rx back to you.

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For the wearer, this results in lenses that look better and perform better since the world they see is closer to natural size. In addition, the lenses provide a larger clear field-of-vision through the window of the lens frame, since magnification of objects seen through the lens has been neutralized. However, modern aspheric semi-finished lens blanks are rotationally symmetrical—that is, within a base curve, there is only one amount of asphericity and it is the same in all meridians for all prescriptions for which the lens blank is intended. Therefore, prescriptions with cylinder corrections (for astigmatism) have only one meridian corrected by the asphericity.

For patients with astigmatism, the resulting areas of clear vision are improved most significantly in the sphere power meridian of the prescription. The cylinder meridian would not have the correct asphericity due to the difference in power and the field of clear vision in that meridian would be reduced when compared to the other meridian. If the ability to aspherize the power in the cylinder meridian was also possible, then the field of clear vision in both meridians would be further improved and you would be able to offer the same quality of vision to the full range of single-vision wearers, including those with high prescriptions. This is, in fact, the case for lenses called double aspheric.

Dec 31, 2014 — Suppose you want to frame an object of size a at distance l . Then, roughly, a/l = s/f where s is the sensor size and f is the focal length.