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Large format lenses are photographic optics that provide an image circle large enough to cover the large format film or plates used in large format cameras.. Photographic optics generally project a circular image behind that is only required to have acceptable correction of aberrations over the intended film/sensor diagonal with little room to spare.
In the best-known version of the illusion, two circles of identical size are placed near each other, and one is surrounded by large circles while the other is surrounded by small circles. As a result of the juxtaposition of circles, the central circle surrounded by large circles appears smaller than the central circle surrounded by small circles.
The two orange circles are exactly the same size; however, the one on the right appears larger. Ehrenstein illusion The Ehrenstein illusion is an optical illusion studied by the German psychologist Walter Ehrenstein in which the sides of a square placed inside a pattern of concentric circles take an apparent curved shape.
The image circle is the cross section of the cone of light transmitted by a lens or series of lenses onto the image plane. When this light strikes a perpendicular target such as photographic film or a digital camera sensor, it forms a circle of light – the image circle. Various sensor aspect ratios may be used which all fit inside the same ...
Lenses produced for 35 mm film cameras may mount well on the digital bodies, but the larger image circle of the 35 mm system lens allows unwanted light into the camera body, and the smaller size of the image sensor compared to 35 mm film format results in cropping of the image. This latter effect is known as field-of-view crop.
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The larger the aperture for a given wavelength, the finer the detail that can be distinguished in the image. This can also be expressed as x f = 1.22 λ d , {\displaystyle {\frac {x}{f}}=1.22\,{\frac {\lambda }{d}},} where x {\displaystyle x} is the separation of the images of the two objects on the film, and f {\displaystyle f} is the distance ...
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