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The Nikon D5100 is a 16.2-megapixel DX-format DSLR F-mount camera announced by Nikon on April 5, 2011. [3] It features the same 16.2- megapixel CMOS sensor as the D7000 with 14-bit depth, [ 1 ] while delivering Full HD 1080p video mode at either 24, 25 or 30 fps.
The flash unit sets up a circuit between shoe and contact—when it is completed by the camera, the flash fires. In addition to the central contact point, many cameras have additional metal contacts within the "U" of the hot shoe. These are proprietary connectors that allow for more communication between the camera and a "dedicated flash".
Nikon refers to this technique as "3D matrix metering", although different camera manufacturers use different terms for this technique. Canon incorporated this technique in E-TTL II. More advanced TTL flash techniques include off-camera flash lighting, where one or more flash units are located at different locations around the subject.
An ADP-MAA adapter to the iISO flash shoe is however provided with the Sony SLT-A99, and the newest flash Sony HVL-F60M, which uses the new hotshoe comes with a reverse adapter ADP-AMA for older Sony and Minolta cameras. The last cameras introduced utilizing the iISO hotshoe in 2012 were the SLT-A37 and NEX-7 as well as the Hasselblad Lunar.
The Nikon SB-500 is a lightweight and very compact shoe-mount flash unit with coverage for a 24 mm lens on an FX camera or a 16 mm lens on DX camera and combined with 100 lux LED for video light, powered by only two AA-size batteries. SB-500 is a very capable flash with a variable angle 'bounce' head (up to 90°) and rotates 180° for soft ...
Flash units are commonly built directly into a camera. Some cameras allow separate flash units to be mounted via a standardized accessory mount bracket (a hot shoe). In professional studio equipment, flashes may be large, standalone units, or studio strobes, powered by special battery packs or connected to mains power.