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Can be used as wireless (optical) controller for other Canon flashes Yes Canon Speedlite 600EX-RT [6] 60m/ 196.9 ft at 200mm zoom-head position Yes 20-200mm (14mm diffusor) 1/1-1/128 (1/3 steps) E-TTL II yes yes (360) 3.3 sec Yes (only when using Canon master) Can be used as wireless (optical) controller for other Canon flashes Yes
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The Speedlite 420EX is an external flash formerly made by Canon. The Speedlite 420EX is one of Canon's older mid-range flashes, being replaced by the 430EX in 2005. It was primarily intended for users wanting to step up from the entry-level flashes, as well as for use as a slave flash along with the more advanced Speedlite 550EX flash.
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.
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.
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.
Slave flash, where the flash from a safe flash unit connected to the camera triggers an unconnected flashgun which, if connected, would present a dangerous voltage, is another way to use a flashgun which cannot be connected to a hot shoe; indeed, it can be used for a camera with built-in flash and no hot shoe.
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 ...