Why it is called as BULB ( bulb mode ) in SLR

[ragmaan]

Hi Friends,
Could you anyone explain or give the realstuff behind the bulb mode.

Why it is called as Bulb mode ( rather than shutter or Aperture ).

Thanks in Advance

[WooD]

The term bulb is a reference to old-style pneumatically actuated shutters; squeezing an air bulb would open the shutter and releasing the bulb would close it. According to the Focal Encyclopedia of Photography[3]:

BULB EXPOSURE (B). Another term for a brief exposure—in which the shutter remains open only so long as the shutter release is held down. The word originated with the early pneumatic shutter release.
It is not clear when the term actually originated. It appears that when instantaneous shutters were introduced, they included a B setting so that the familiar bulb behavior could be duplicated with a cable release. This may have been the origin of the term bulb in reference to shutter settings.

From here.............

http://en.wikipedia.org/wiki/Bulb_(photography)

[smc1377]

Let me google that for you

[ragmaan]

From olden days, People were used separate bulb for flashes , The function was When photographer opened the shutter ( manually ), they use the bulb for flash ( and it will be on )
Then again he closed the shutter . So bulb will be on throughout the process ( from open to closed )... This was now called Bulb mode . You can see some photography process in olden movies... And also they will use single bulb for single shot.. :-)

My Teacher ( Mr Raja ) shared this one to me... Thanks Guru.

If any one have other concerns , please let me know.