It also helps to partly ( 90 % ) remove the gold coating of some flash tubes which otherwise suppresses UV.
12.
The continuous lighting uses tungsten bulbs with a colour temperature of around 3200?instead of daylight-balanced ( 5500?) flash tubes.
13.
Their usual purpose is to briefly power a high-voltage flash tube, used to illuminate a photographic subject or optically pump a laser rod.
14.
This supports TTL and manual models only, and contains two flash tubes, one on either side, which can be fired separately or together.
15.
Ring flashes, with flash tubes arranged in a circle around the front of the lens, can be helpful in lighting at close distances.
16.
Working with an electronics specialist he devised a flash tube / capacitor combination which provided the required combination of high-power flash and extremely short flash duration.
17.
A quick-and-dirty method for switching, especially for those using a flash camera for the main components, is to use the flash tube itself as a switch.
18.
The ST-E2 also uses a modulated flash tube for this purpose, but it is fitted with a near infra-red filter ( it serves no other purpose ).
19.
As flash tubes require very high current for a very short time to operate, photoflash capacitors are designed to supply high discharge current pulses without excessive internal heating.
20.
But its flash tube did so repeatedly and quickly in a series of bursts of very short duration, allowing an accompanying camera or human eye to capture very fast motions.
