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Sony HVL-F36AM 36 at 85 mm no 24-85mm (17mm diffuser) No TTL/ADI, Wireless TTL/ADI Yes No 5-6 Yes (Body only/Or HVL-F58AM on Sony A900) HSS Nikon SB-26 AF Speedlight [40] 18m (at 18mm) / 50m (at 85mm) at ISO100 Screwlock PC 18 - 85mm 1/1 - 1/64 TTL yes yes 3sec yes Built in wide flash adapter and bounce card. Nikon SB-28 AF Speedlight [41]
Nikon SB-400 Flash (GN 69 ft, 21 m @ 27 mm) The SB-400 is a lightweight and very compact shoe-mount flash unit, powered by only two AA-size batteries. It uses a 40 mm xenon tube. Despite its small size, SB-400 is a very capable flash with a variable angle 'bounce' head (up to 90 deg.). The head lacks tilt movement which is common to larger flashes.
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".
A full-power flash from a modern built-in or hot shoe mounted electronic flash has a typical duration of about 1ms, or a little less, so the minimum possible exposure time for even exposure across the sensor with a full-power flash is about 2.4 ms + 1.0 ms = 3.4 ms, corresponding to a shutter speed of about 1 ⁄ 290 s. However some time is ...
Guide number distances are always measured from the flash device to the subject; if the flash device is detached from the camera, the position of the camera is irrelevant. Furthermore, unless a flash device has an automatic zoom feature that follows the setting of a camera's zoom lens, guide numbers do not vary with the focal length of lenses.
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.