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2. Flash (photography) - Wikipedia

   en.wikipedia.org/wiki/Flash_(photography)

   For more sophisticated and longer-range lighting several synchronised flash units at different positions may be used. Ring flashes that fit to a camera's lens can be used for shadow free portrait and macro photography; some lenses have built-in ring-flash. [16] In a photographic studio, more powerful and flexible studio flash systems are used.

3. Photoflash capacitor - Wikipedia

   en.wikipedia.org/wiki/Photoflash_capacitor

   The light energy emitted by a flash is supplied by the capacitor, and is proportional to the product of the capacitance and the voltage squared; photoflash capacitors may have capacitance in the range 80-240 microfarads (μF) and voltages from 180 to 330 volts for flash units built into small disposable and compact cameras, increasing for units ...

4. Flash comparison - Wikipedia

   en.wikipedia.org/wiki/Flash_comparison

   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

5. Cactus (camera equipment brand) - Wikipedia

   en.wikipedia.org/wiki/Cactus_(camera_equipment...

   Cactus has been manufacturing wireless flash triggers using radio signal since 2007 and has been focusing its research on cross-brand compatibility in radio flash triggering system. Its V4 wireless flash trigger and V5 wireless flash transceiver are both equipped with a multi-pin hotshoe and work with most of the portable flashes, but are not ...

6. Canon EOS flash system - Wikipedia

   en.wikipedia.org/wiki/Canon_EOS_flash_system

   The pre-flash may cause undesirable reactions from animate objects - e.g. humans may blink as a reaction to the pre-flash, and have their eyes closed by the time the main flash occurs. When using flash exposure lock (FEL), the pre-flash is fired when FEL is activated. E-TTL has two major disadvantages over A-TTL when used with film cameras. [2]

7. Flash synchronization - Wikipedia

   en.wikipedia.org/wiki/Flash_synchronization

   Due to their construction, focal plane shutters, as used on most single-lens reflex cameras (SLRs), only allow normal xenon flash units to be used at shutter speeds slow enough that the entire shutter is open at once, typically at shutter speeds of 1/60 or slower, although some modern cameras may have an X-sync speed as high as 1/500 (e.g ...