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A twin-lens reflex camera (TLR) is a type of camera with two objective lenses of the same focal length. One of the lenses is the photographic objective or "taking lens" (the lens that takes the picture), while the other is used for the viewfinder system, [ 1 ] which is usually viewed from above at waist level.
The Four Thirds System sensor size (17.3 mm x 13 mm) is the smallest currently being used in DSLR cameras. This leads to both advantages (theoretically smaller, lighter and cheaper lenses and camera bodies) and disadvantages (slightly lower image quality, especially in low-light situations).
Sony offers a number of interchangeable-lens cameras in its α (Alpha) line. The line has featured cameras employing three different imaging technologies and two mounts: Digital single-lens reflex cameras (DSLR) – early α models with three-digit model numbers employ this technology; they all feature Sony's A-mount.
The Nikon D90 is the first Nikon camera to include a third firmware module, labeled "L," which provides an updateable lens distance integration database that improves autoexposure functions. [ 5 ] [ 6 ] [ 7 ] Some of its accessories, such as the MB-D80 battery grip and ML-L3 wireless remote, are also compatible with its predecessor the D80.
In June 2011 Pentax announced the 'Pentax Q' mirrorless interchangeable lens camera and the 'Q-mount' lens system. It has a small, 1/2.3 inch 12.4 megapixel LED Backlit CMOS sensor. [42] Announced in September, 2012, the Q10 has a slightly redesigned body and an improved sensor. Most features and specifications were unchanged.
The Nikon D3100 is a 14.2-megapixel DX format DSLR Nikon F-mount camera announced by Nikon on August 19, 2010. It replaced the D3000 as Nikon's entry level DSLR. It introduced Nikon's new EXPEED 2 image processor and was the first Nikon DSLR featuring full high-definition video recording with full-time autofocus and H.264 compression, instead of Motion JPEG compression.