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This was the first model to offer a 6x4.5 cm frame, allowing 15 shots on a standard 120 roll film. The M645 was a true system camera , with interchangeable viewfinders and lenses. It used an electronically controlled cloth focal plane shutter offering speeds of 8 seconds to 1/500 second in one-stop increments.
There is no precise definition of the term, but lenses marketed as "standard zoom" usually cover a range of at least 30mm to 70mm in terms of 35mm equivalent focal length with an optical zoom ratio of 2.5× (e.g. 28-70mm) to 5× (e.g. 24-120mm) — the most common being 3× (e.g. 24-70mm). [1]
Very-large-aperture lenses designed to be useful in very low light conditions with apertures ranging from f/1.2 to f/0.9 are generally restricted to lenses of standard focal length because of the size and weight problems that would be encountered in telephoto lenses and the difficulty of building a very wide aperture wide angle lens with the ...
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Interchangeable lenses for digital and conventional SLR cameras, including compact high-ratio zoom lenses of which Tamron was the pioneer in 1992 when it released the 28–200 mm. [3] The most-current lens of this type is the AF 16–300 mm F/3.5-6.3 Di II VC PZD MACRO. Tamron was the maker of the manual-focus Adaptall series which have ...
Apart from this zone-focusing, a distance scale in meters or feet and a depth-of-field scale are provided to let the photographer make an educated guess of whether the picture will be in focus. Three shutter speeds are provided; B, 1/25 and 1/50s. The aperture can be set at 9 (full aperture), 11 and 22.