what is meant by bulb min shutter ?


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spitfire

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#1
Hi

sometimes the specs of a cam is written as : min shutter :8 sec + Bulb

what does it mean by bulb ?

and how does it actually lengthen the shutter speed ?


thx. :confused:
 

Newman

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#2
This means that the shutter can be set to open for as long as 8 sec or if you use bulb mode, as long as the shutter button is pressed. In bulb mode, the shutter will close only after you release the shutter button.
 

spitfire

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#3
thx. but wudnt mean that it will induce camera shake since we are holding on to the shutter button ?
 

AReality

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#4
spitfire said:
thx. but wudnt mean that it will induce camera shake since we are holding on to the shutter button ?

Usually is used on a tripod, with a wired/wireless trigger connected to the camera, for very long exposures.
 

spitfire

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#5
AReality said:
Usually is used on a tripod, with a wired/wireless trigger connected to the camera, for very long exposures.
thx so thats when a remote cord would be useful for a digicam rite ?
 

Newman

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Not advisable to use wireless remote for long exposures. Wireless RC is using infrared which requires a line of sight. So if you press down the shutter and then you lose the line of sight (eg drop the rc), the shutter would close.
 

Ian

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Feb 20, 2002
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#11
spitfire said:
Hi

sometimes the specs of a cam is written as : min shutter :8 sec + Bulb

what does it mean by bulb ?

and how does it actually lengthen the shutter speed ?


thx. :confused:
The term "Bulb" is derived from the view cameras of the mid to late 19th century and early 20th century where an pneumatic air release was to control the shutter. At one end was a bulb like rubber ballon that was squeezed to release the shutter and the shutter closed when the photograher stopped squeezing the bulb. Such releases can still be obtained today, though they have largely been replaced with either an electronic control or pluger and wire cable release mechanism.

Bulb mode is now used to denote a long exposure period, often running to many minutes or even hours. The limiting factor on the potential length of time for an exposure with bulb mode for cameras with electronic shutters is the time it takes to flatten the battries in the camera, or if using an external power source how long the external source can last. Cameras with mechanical shutters have no limit to exposure time when using bulb mode.

Ian
 

Ian

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#12
Newman said:
Not advisable to use wireless remote for long exposures. Wireless RC is using infrared which requires a line of sight. So if you press down the shutter and then you lose the line of sight (eg drop the rc), the shutter would close.
Not all wireless remotes use infrared as the control signal. Nikon for example produced a series of long range wireless remote control systems that used radio signals. Such units have a range of around 1.1km and are frequently used when photographing in hazardous conditions. Other manufacturers have produced similar units.

Nor do all cameras require a continious signal from a wireless remote to keep the shutter open. The Nikon F5 for example can be configured to require two trigger pulses, one to open the shutter and a second to close the shutter.
 

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