i am just wondering but if so what would be the wattage value of the bulb
2006-12-24 02:33:58 · 5 answers · asked by macgyver 1 in Science & Mathematics ➔ Engineering
An incandescent light by itself would not work, The light intensity generated by the filament alone would be insufficient to illuminate the subject for proper film exposure.
However:
Old style flash bulbs are incandescent. The glowing filament is used to ignite strands of magnesium. The magnesium burns brightly and quickly in a flash bright enough for proper exposure.
Because of the slight delay to ignite a flash bulb the triggering of a flash bulb is done earlier prior to opening the shutter.
When flashbulbs and electronic flashes were in use, 35mm cameras were provided with two sync cord connections. F & X which allowed connection of either a flashbulb or electronic flash.
Flash bulbs have fallen into obsolecense and it is rare to find a camera capable of using a flashbulb.
2006-12-24 05:30:31 · answer #1 · answered by MarkG 7 · 0⤊ 0⤋
An incandescent bulb can't be used as a flash. The amount of light needed to expose typical (eg. 100ASA) film is more than you'll get from a regular bulb, unless you leave the shutter open for a long time.
The reason for using a flash is to get the large "burst" of light, sufficient to expose the film.
If you use faster film, or a digital camera, then a regular incandenscent bulb would usually work, but it's obviously not operating as a "flash".
Also, a regular incandescent bulb - if used to generate the amount of light needed - would probably burn out instantly. The filament is not designed for that kind of use.
2006-12-24 02:50:50 · answer #2 · answered by so far north 3 · 0⤊ 0⤋
I am sure it could be altered to do so, but the time from triggering to max brightness would be a problem, unless you were doing an open shutter shot, where time doesn't matter. Wattage would depend on how much light you would really need. Another way to do it is, have the bulb up to max brightness and use a shutter to hold back the light until it was needed and snap the shutter open and closed. This is done on Large cameras/Steppers/Scanners used in the electronics business. I have used a 1kwatt UV lamp to expose wafers. The open time and close times were fairly long depending on the image being exposed, some shutters were electric, some used air and vacuum, air to open it, vacuum to close it. Use a 1000 watt bulb, light up your life.
2006-12-24 02:58:14 · answer #3 · answered by Robert D 4 · 0⤊ 0⤋
NO!, the flash will not light with a regular light bulb. The flash is a closed environment with an electrical arc passed through a gas (medium) which produces the very white light. The arc stimulates the gas's molecules.
2006-12-24 03:36:16 · answer #4 · answered by acatalinus 2 · 0⤊ 0⤋
No. Flashbulbs are designed to "burn out". The filaments are magnesium fiber, and the bulb contains air. An incadescent bulb uses tungsten filament and the bulb is evacuated to prevent burnout. There are, however, photoflood lights that continue to burn for some time. They are deliberately underdesigned to make them burn hotter, giving light closer to white, but they are only good for about 400 hours.
2006-12-24 06:13:22 · answer #5 · answered by Anonymous · 0⤊ 0⤋