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Intermediate between fixed magnification and zoom magnification systems is a system attributed to Galileo as the "Galilean optical system"; here an arrangement of fixed-focus convex lenses is used to provide a fixed magnification, but with the crucial distinction that the same optical components in the same spacing will, if physically inverted ...
A C79 Optical Sight. The C79 optical sight (SpecterOS3.4x) is a telescopic sight manufactured by Elcan.A variant, the M145 Machine Gun Optic is in use by the US military. It is 3.4×28, meaning 3.4x magnification, and a 28mm diameter objective lens.
A stereo transparency viewer is a type of stereoscope that offers similar advantages, e.g. the View-Master. Disadvantages of stereo cards, slides or any other hard copy or print are that the two images are likely to receive differing wear, scratches and other decay. This results in stereo artifacts when the images are viewed.
Stereo thresholds almost always improve, often several-fold, with training [8] and involve perceptual factors, differing in their particulars for each test. [9] This is most vividly evident in the time it takes to "solve" a random-dot stereogram rapidly decreases between the first exposure and subsequent views [ 10 ]
Stereoscopy creates the impression of three-dimensional depth from a pair of two-dimensional images. [5] Human vision, including the perception of depth, is a complex process, which only begins with the acquisition of visual information taken in through the eyes; much processing ensues within the brain, as it strives to make sense of the raw information.
Design difference in grabber interfaces between the Picatinny rail and the new NATO Accessory Rail. The scope mount itself can be used as the interface for attaching other accessories. For mounting telescopic sights and/or other accessories to guns several rail interface systems are available to provide a standardized mounting platform.