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A condenser (right) and its respective diaphragm (left) A condenser is an optical lens that renders a divergent light beam from a point light source into a parallel or converging beam to illuminate an object to be imaged. Condensers are an essential part of any imaging device, such as microscopes, enlargers, slide projectors, and telescopes.
Mixing mounting systems requires an adapter, which most often results in compromises such as loss of functionality (e.g. lack of autofocus or automatic aperture control). Furthermore, the adapter may require an additional optical element to correct for varied registration distances (the distance from the rear of the mount to the focal plane on ...
The depth-of-field adapter (also called a DOF adapter or 35 mm adapter) is a largely obsolete device that uses a ground glass focusing screen to enable the use of interchangeable lenses on a fixed lens camcorder. [5] There are also lens adapters made for other optical systems, including microscopes and telescopes.
Compared with some low-cost cameras that provide an optical viewfinder that uses a small auxiliary lens, the DSLR design has the advantage of being parallax-free: it never provides an off-axis view. A disadvantage of the DSLR optical viewfinder system is that when it is used, it prevents using the LCD for viewing and composing the picture.
The T-mount is a standard lens mount for cameras and other optical assemblies. The usual T-mount is a screw mount using a male 42×0.75 (42 mm diameter, 0.75 mm thread pitch) metric thread on the lens with a flange focal distance of 55 mm and a mating female 42mm thread on a camera adapter or other optical component.
M42 adapters work best on bodies with a flange depth less than or equal to the M42's flange depth, which includes the popular Canon EF-mount, the Pentax K-mount, the Minolta/Konica Minolta/Sony A-mount, the Sony E-mount, the Samsung NX-mount, the Fujifilm X-mount and the Four Thirds System including the Micro Four Thirds system. This allows the ...
The sampling aperture can be a literal optical aperture, that is, a small opening in space, or it can be a time-domain aperture for sampling a signal waveform. For example, film grain is quantified as graininess via a measurement of film density fluctuations as seen through a 0.048 mm sampling aperture.
The ability of a lens to resolve detail is usually determined by the quality of the lens, but is ultimately limited by diffraction.Light coming from a point source in the object diffracts through the lens aperture such that it forms a diffraction pattern in the image, which has a central spot and surrounding bright rings, separated by dark nulls; this pattern is known as an Airy pattern, and ...