Nikon Action Extremes 8x40, 10x50 and 12x50
... Unlike these other two mentioned it does not drop off quickly, but sharpness holds fairly well out towards the edges. The 12x50 AE did a little better than the 10x50. I would say it was decent out to 70% from center. But the 10x50 has a wider field of view. So really both the 10x50 and the 12x50 are ...
... Unlike these other two mentioned it does not drop off quickly, but sharpness holds fairly well out towards the edges. The 12x50 AE did a little better than the 10x50. I would say it was decent out to 70% from center. But the 10x50 has a wider field of view. So really both the 10x50 and the 12x50 are ...
Prism, Prism, Prism!
... 2. Understand spatial perception changes caused by viewing through prism 3. Learn about therapy techniques that utilize prisms Compensatory – reduces work, moves the image to where the eye sees Therapeutic – increases work, moves the image to where we want the eyes to look Therapeutic prism is used ...
... 2. Understand spatial perception changes caused by viewing through prism 3. Learn about therapy techniques that utilize prisms Compensatory – reduces work, moves the image to where the eye sees Therapeutic – increases work, moves the image to where we want the eyes to look Therapeutic prism is used ...
Binocular Objects (MS Word)
... one by one. The beginner will have to be careful not to confuse the various objects. The principal stars of Sagittarius form the famous “Teapot” asterism. The brightest part of the Milky Way seems to emerge from the Teapot's spout like a puff of steam. M22 The Great Sagittarius star cluster is a ver ...
... one by one. The beginner will have to be careful not to confuse the various objects. The principal stars of Sagittarius form the famous “Teapot” asterism. The brightest part of the Milky Way seems to emerge from the Teapot's spout like a puff of steam. M22 The Great Sagittarius star cluster is a ver ...
Autumn Asterisms for binoculars 2013
... Ursa Minor – the Mini Coathanger Most astronomers are familiar with the Coathanger (Collinder 399) in Vulpecula, but did you know there is another one? Ursa Minor boasts its own Coathanger consisting of 11 stars from 9th to 11th magnitude spanning about ...
... Ursa Minor – the Mini Coathanger Most astronomers are familiar with the Coathanger (Collinder 399) in Vulpecula, but did you know there is another one? Ursa Minor boasts its own Coathanger consisting of 11 stars from 9th to 11th magnitude spanning about ...
20 pm - Starmap
... As a starting point, face North, holding the map in your eyesight direction, with its North down. As you change the direction, rotate the map accordingly. The objects listed on the first page can be observed with naked eyes, in clear skies, with moderate light pollution. Close your eyes one minute a ...
... As a starting point, face North, holding the map in your eyesight direction, with its North down. As you change the direction, rotate the map accordingly. The objects listed on the first page can be observed with naked eyes, in clear skies, with moderate light pollution. Close your eyes one minute a ...
Binoculars - shapes and lenses
... Roof prism binoculars are lighter in weight, more visually pleasing with the straight-through shape, and by their construction design, much more durable. But it costs more to get good optical quality in roof prism binoculars. Inherent optical flaws in the roof prisms do need correction, which costs ...
... Roof prism binoculars are lighter in weight, more visually pleasing with the straight-through shape, and by their construction design, much more durable. But it costs more to get good optical quality in roof prism binoculars. Inherent optical flaws in the roof prisms do need correction, which costs ...
September Globular Clusters - Salisbury Plain Observing Group
... M15 lies around 30,000 light years away, a diameter of 200 light years, and like M13 contains many red giant stars, but with its greater distance appears fainter and more compact. It’s also noted as one of the few globulars to contain a planetary nebula, Pease 1, which at magnitude 14, can be locate ...
... M15 lies around 30,000 light years away, a diameter of 200 light years, and like M13 contains many red giant stars, but with its greater distance appears fainter and more compact. It’s also noted as one of the few globulars to contain a planetary nebula, Pease 1, which at magnitude 14, can be locate ...
Prism Design
... equations are measured with respect to the surface normal at the point of incidence of the ray on the surface. A change in algebraic sign of the ray angle occurs upon reflection. The algebraic signs of the angles are not shown in either of these equations. The entrance and exit faces of most prisms ...
... equations are measured with respect to the surface normal at the point of incidence of the ray on the surface. A change in algebraic sign of the ray angle occurs upon reflection. The algebraic signs of the angles are not shown in either of these equations. The entrance and exit faces of most prisms ...
Calculation of image position, size and orientation using first order
... They will, however, introduce the same aberrations as an equivalent thickness plane parallel plate. Spherical aberration and longitudinal chromatic aberration are introduced into an on-axis beam. TIR often fails when prisms are used with fast f/# beams. In polarized light applications, TIR at the pr ...
... They will, however, introduce the same aberrations as an equivalent thickness plane parallel plate. Spherical aberration and longitudinal chromatic aberration are introduced into an on-axis beam. TIR often fails when prisms are used with fast f/# beams. In polarized light applications, TIR at the pr ...
Device for projecting and viewing stereoscopic pictures
... ing to the invention use is made not only of the backward rays, but also of the lateral sess the disadvantage that they have a right rays which are usually lost. In this manner and a wrong side, one of theends having about twice as many rays are utilized and to be placed before the eyes: if the othe ...
... ing to the invention use is made not only of the backward rays, but also of the lateral sess the disadvantage that they have a right rays which are usually lost. In this manner and a wrong side, one of theends having about twice as many rays are utilized and to be placed before the eyes: if the othe ...
angles_telescopes
... • theta = S/D will yield angle in radians – there are 2*pi (or roughly 2*3.1416) radians in a circle – so 1 radian = 57 degrees ...
... • theta = S/D will yield angle in radians – there are 2*pi (or roughly 2*3.1416) radians in a circle – so 1 radian = 57 degrees ...
Astrophotography Manual
... size of the objective (front) lens in millimetres. 2. Field of view This means the area you see. This is the inverse of magnification. That means the higher the magnification the smaller the view. Numbers expressing field on view on binoculars are: 7o 30' or 131 metres. 7o 30' means you can see 7o ...
... size of the objective (front) lens in millimetres. 2. Field of view This means the area you see. This is the inverse of magnification. That means the higher the magnification the smaller the view. Numbers expressing field on view on binoculars are: 7o 30' or 131 metres. 7o 30' means you can see 7o ...
Sample pages 1 PDF
... A secondary effect is that they fold the light path, so that the binocular is shorter than it would otherwise be. For smaller binoculars in particular, this makes them easier to handle. As stated above, binoculars are often classified according to their prism type. For modern binoculars without angl ...
... A secondary effect is that they fold the light path, so that the binocular is shorter than it would otherwise be. For smaller binoculars in particular, this makes them easier to handle. As stated above, binoculars are often classified according to their prism type. For modern binoculars without angl ...
Mapping flight lines is a technically challenging process of
... although it is the case that a law of diminishing returns seems to apply and the improvement of quality per increase in price gets smaller the more you pay. In general terms I would suggest that the old fashioned Porro Prism (kinked) designs, yield better value for money as they have fewer optical s ...
... although it is the case that a law of diminishing returns seems to apply and the improvement of quality per increase in price gets smaller the more you pay. In general terms I would suggest that the old fashioned Porro Prism (kinked) designs, yield better value for money as they have fewer optical s ...
binocular doubler
... Any birder or sportsman will admit there are times when they wished they had a spotting scope instead of binoculars. For those instances when more magnification is needed, the new Doubler accessory from Bushnell is the perfect solution. The Doubler is a 2.5x eyepiece that can be fitted onto a binocu ...
... Any birder or sportsman will admit there are times when they wished they had a spotting scope instead of binoculars. For those instances when more magnification is needed, the new Doubler accessory from Bushnell is the perfect solution. The Doubler is a 2.5x eyepiece that can be fitted onto a binocu ...
Binoculars - Mecklenburg Audubon Society
... If you wear eyeglasses and want to see as well as you can, fold-down the rubber eye cups are a must. Those who do not wear glasses should also look carefully at any binocular they are planning to buy to see how deeply the ocular lenses are recessed. Some poorly designed models have such deeply reces ...
... If you wear eyeglasses and want to see as well as you can, fold-down the rubber eye cups are a must. Those who do not wear glasses should also look carefully at any binocular they are planning to buy to see how deeply the ocular lenses are recessed. Some poorly designed models have such deeply reces ...
Name: Notes – #6 Our Sky Through Binoculars and Telescopes 1
... Notes – #6 Our Sky Through Binoculars and Telescopes 1. Binoculars and telescopes do three things: A. Collect more _______________________ ...
... Notes – #6 Our Sky Through Binoculars and Telescopes 1. Binoculars and telescopes do three things: A. Collect more _______________________ ...
Binoculars
Binoculars, field glasses or binocular telescopes are a pair of identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects. Most are sized to be held using both hands, although sizes vary widely from opera glasses to large pedestal mounted military models.Unlike a (monocular) telescope, binoculars give users a three-dimensional image: for nearer objects the two views, presented to each of the viewer's eyes from slightly different viewpoints, produce a merged view with an impression of depth.