"B" shutter setting?

In article , Robert Coe
wrote:

: What, exactly, does it do (or did it do)?
:
: bulb is for exposures longer than the slowest built-in shutter speed,
: generally ranging from a few seconds to a few hours.
:
: you press the shutter release button to open the shutter, hold it down
: to keep it open and when you let go, it closes. it gets its name from
: air bulbs, similar to the one your doctor uses when taking blood
: pressure.

Does anyone else question that etymology?

i don't. i remember air bulb shutter releases, and it wasn't all that
long ago either. cable releases work well for short distances, but for
longer runs they tend to bind. using air is a lot more reliable.

Since I first picked up a camera,
I've understood the "bulb" referred to by the "B" setting to be a flashbulb.
Early flashbulbs had a variety of speeds at which they reached full
brightness, and some flash units were independent of the camera and had to be
set off by hand. (My dad had one of those.) I was told that the "B" setting
was to accommodate the variety of different equipment in use.

some cameras had multiple flash sync terminals to match flash bulb
timings versus electronic flash.

I consider the air-release bulb explanation to be suspect anyway, because I
doubt that an air release could be counted on to hold pressure well enough to
guarantee that the shutter would stay open. I've seen air releases used a fair
number of times, but never to control a long exposure. For that you would have
used a cable release with a ratchet or screw lock. An air release was for when
you were too far from the camera to use a cable release.

ever have your blood pressure taken? that seems to hold pretty well,
does it not?

I realize that I'm at odds with Wikipedia. But it wouldn't be the first time
they've been wrong.

true, but this isn't one of them.

Robert Coe wrote:

Does anyone else question that etymology? Since I first picked up a camera,
I've understood the "bulb" referred to by the "B" setting to be a flashbulb.

It can't be. "B" appears on shutters made well before the advent
of flashbulbs. You can see "B" on late 19th century shutters,
while flashbulbs were developed in the late 1920s and were rare
before the 1930s.

The "B" setting is useful for open flash with bulbs or flashpowder,
but the "bulb" of the name is the pneumatic release.

I consider the air-release bulb explanation to be suspect anyway, because I
doubt that an air release could be counted on to hold pressure well enough to
guarantee that the shutter would stay open. I've seen air releases used a fair
number of times, but never to control a long exposure.

That's because you haven't met good ones. Good quality rubber
bulbs, valves and hoses can hold pressure all day. They used
to be common in the era of pneumatic shutters 100 years ago.

An air release was for when
you were too far from the camera to use a cable release.

The cable release started taking over from the air release about
100 years ago. It happened about the same time that clockwork
shutters started taking over from pneumatic ones. (You can use
a cable release with many pneumatic shutters, the standard screw
fitting is actually originally intended to fit the Compound pneumatic
shutters, but by and large you can't hook up a hose directly to
a clockwork shutter.)

Peter.
--

Robert Coe writes:

On Thu, 09 Feb 2012 12:50:25 -0500, nospam wrote:
: In article , Jennifer
: Murphy wrote:
:
: I happened to see this question on an old Trivial Pursuit card:
:
: What does the camera shutter speed B stand for?
:
: The answer is "Bulb".
:
: Is this still used?
:
: yes. many cameras have a 'b' or bulb setting.
:
: Does it mean "flash"?
:
: no.
:
: What, exactly, does it do (or did it do)?
:
: bulb is for exposures longer than the slowest built-in shutter speed,
: generally ranging from a few seconds to a few hours.
:
: you press the shutter release button to open the shutter, hold it down
: to keep it open and when you let go, it closes. it gets its name from
: air bulbs, similar to the one your doctor uses when taking blood
: pressure.

Does anyone else question that etymology? Since I first picked up a camera,
I've understood the "bulb" referred to by the "B" setting to be a flashbulb.
Early flashbulbs had a variety of speeds at which they reached full
brightness, and some flash units were independent of the camera and had to be
set off by hand. (My dad had one of those.) I was told that the "B" setting
was to accommodate the variety of different equipment in use.

I consider the air-release bulb explanation to be suspect anyway, because I
doubt that an air release could be counted on to hold pressure well enough to
guarantee that the shutter would stay open. I've seen air releases used a fair
number of times, but never to control a long exposure. For that you would have
used a cable release with a ratchet or screw lock. An air release was for when
you were too far from the camera to use a cable release.

I've used air releases, for the sort of time that would be needed to
trigger a bulb, I've never had one leak down enough to close the
shutter. (This doesn't mean I can in any way confirm that etymology;
but my experience is that an air release *could* be used as described,
at least.)

For real time exposures, you use the "T" shutter setting of course,
which doesn't have those problems.

(Another advantage of bulb releases is that the tubing was less stiff,
so it was harder to move the camera accidentally while manipulating it.)

I realize that I'm at odds with Wikipedia. But it wouldn't be the first time
they've been wrong.

Indeed not.

What citations do they give to support the current article?
--
David Dyer-Bennet, ; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info

On Fri, 17 Feb 2012 16:44:29 -0500, Robert Coe wrote:

On Thu, 09 Feb 2012 12:50:25 -0500, nospam wrote:
: In article , Jennifer
: Murphy wrote:
:
: I happened to see this question on an old Trivial Pursuit card:
:
: What does the camera shutter speed B stand for?
:
: The answer is "Bulb".
:
: Is this still used?
:
: yes. many cameras have a 'b' or bulb setting.
:
: Does it mean "flash"?
:
: no.
:
: What, exactly, does it do (or did it do)?
:
: bulb is for exposures longer than the slowest built-in shutter speed,
: generally ranging from a few seconds to a few hours.
:
: you press the shutter release button to open the shutter, hold it down
: to keep it open and when you let go, it closes. it gets its name from
: air bulbs, similar to the one your doctor uses when taking blood
: pressure.

Does anyone else question that etymology? Since I first picked up a camera,
I've understood the "bulb" referred to by the "B" setting to be a flashbulb.
Early flashbulbs had a variety of speeds at which they reached full
brightness, and some flash units were independent of the camera and had to be
set off by hand. (My dad had one of those.) I was told that the "B" setting
was to accommodate the variety of different equipment in use.

In the early days of photography exposures could range from 1/20sec to
20sec. So-called 'instantaneous' shutters could cope with the shorter
exposures but the longer exposures had to be conducted by the
photographer. In the very early days the conventional way for the
photographer to do this was by removing the lens cap and then putting
it back again. Manufacturers of instantaneous shutters began to offer
the ability for the photographer to hold the shutter open for the
desired length of time and then to release it.

In these early days pneumatic systems utilising rubber bulbs were the
predominate type of remote control for shutters. As well as the
various instantaneous speed settings, shutters would offer the
photographer the opportunity to directly control the exposure via the
bulb rather than leaving it to the timer in the shutter. So that's all
the 'B' means, that the shutter is under the control of the Bulb.

I consider the air-release bulb explanation to be suspect anyway, because I
doubt that an air release could be counted on to hold pressure well enough to
guarantee that the shutter would stay open. I've seen air releases used a fair
number of times, but never to control a long exposure. For that you would have
used a cable release with a ratchet or screw lock. An air release was for when
you were too far from the camera to use a cable release.

Depending on their condition, air releases are good for several
minutes, or longer. It all depends upon how they are designed and
built.

I realize that I'm at odds with Wikipedia. But it wouldn't be the first time
they've been wrong.

Bob

Regards,

Eric Stevens

On Fri, 17 Feb 2012 22:31:46 +0000 (UTC), Peter Irwin
wrote:

Robert Coe wrote:

Does anyone else question that etymology? Since I first picked up a camera,
I've understood the "bulb" referred to by the "B" setting to be a flashbulb.

It can't be. "B" appears on shutters made well before the advent
of flashbulbs. You can see "B" on late 19th century shutters,
while flashbulbs were developed in the late 1920s and were rare
before the 1930s.

First flashes were in 1899. See
http://en.wikipedia.org/wiki/Flash-lamp

The "B" setting is useful for open flash with bulbs or flashpowder,
but the "bulb" of the name is the pneumatic release.

I consider the air-release bulb explanation to be suspect anyway, because I
doubt that an air release could be counted on to hold pressure well enough to
guarantee that the shutter would stay open. I've seen air releases used a fair
number of times, but never to control a long exposure.

That's because you haven't met good ones. Good quality rubber
bulbs, valves and hoses can hold pressure all day. They used
to be common in the era of pneumatic shutters 100 years ago.

An air release was for when
you were too far from the camera to use a cable release.

The cable release started taking over from the air release about
100 years ago. It happened about the same time that clockwork
shutters started taking over from pneumatic ones. (You can use
a cable release with many pneumatic shutters, the standard screw
fitting is actually originally intended to fit the Compound pneumatic
shutters, but by and large you can't hook up a hose directly to
a clockwork shutter.)

Peter.

Regards,

Eric Stevens

Eric Stevens wrote:
On Fri, 17 Feb 2012 22:31:46 +0000 (UTC), Peter Irwin
wrote:
It can't be. "B" appears on shutters made well before the advent
of flashbulbs. You can see "B" on late 19th century shutters,
while flashbulbs were developed in the late 1920s and were rare
before the 1930s.

First flashes were in 1899. See
http://en.wikipedia.org/wiki/Flash-lamp

That "Flash lamp" is a device for setting off flash powder,
not a flashbulb.

Peter.
--

On Fri, 17 Feb 2012 16:44:29 -0500, Robert Coe wrote:

On Thu, 09 Feb 2012 12:50:25 -0500, nospam
wrote:
: In article , Jennifer :
Murphy wrote:
:
: I happened to see this question on an old Trivial Pursuit card:
:
: What does the camera shutter speed B stand for?
:
: The answer is "Bulb".
:
: Is this still used?
:
: yes. many cameras have a 'b' or bulb setting.
:
: Does it mean "flash"?
:
: no.
:
: What, exactly, does it do (or did it do)?
:
: bulb is for exposures longer than the slowest built-in shutter speed,
: generally ranging from a few seconds to a few hours.
:
: you press the shutter release button to open the shutter, hold it down
: to keep it open and when you let go, it closes. it gets its name from
: air bulbs, similar to the one your doctor uses when taking blood :
pressure.

Does anyone else question that etymology?
I don't.
In the early 60's I acquired an old plate camera (with a lot of other
stuff) from a church jumble sale. The camera had a name plate that
included a date of 1898. The shutter was marked with 1/50 1/25 1/4 sec
and B, T.

Since I first picked up a
camera, I've understood the "bulb" referred to by the "B" setting to be
a flashbulb. Early flashbulbs had a variety of speeds at which they
reached full brightness, and some flash units were independent of the
camera and had to be set off by hand. (My dad had one of those.) I was
told that the "B" setting was to accommodate the variety of different
equipment in use.

This was before the introduction of Flash bulbs.

I consider the air-release bulb explanation to be suspect anyway,
because I doubt that an air release could be counted on to hold pressure
well enough to guarantee that the shutter would stay open. I've seen air
releases used a fair number of times, but never to control a long
exposure. For that you would have used a cable release with a ratchet or
screw lock. An air release was for when you were too far from the camera
to use a cable release.

I realize that I'm at odds with Wikipedia. But it wouldn't be the first
time they've been wrong.

Bob

I never rely on wikipedia.



--
Neil
Reverse ‘a’ and 'r' then delete ‘l’ for address.

On 2012-02-18 12:28 , Neil Ellwood wrote:
I never rely on wikipedia.

Nor should you rely on any single source.


--
"We demand rigidly defined areas of doubt and uncertainty."
Douglas Adams - (Could have been a GPS engineer).