Difference between revisions of "Ibso"
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| − | The '''Ibso''' shutter was made by [[Gauthier]] from 1908 | + | The '''Ibso''' shutter with a 3 blade diaphragm was made by [[Gauthier]] from 1908-1926. It was the first [[everset shutter]] (i.e. an 'automatic' shutter, not needing to be cocked) on the market.<ref>[http://www.prontor.de/go/unternehmen-firmengeschichte/english.html Gauthier (now Prontor) company history] at [http://www.prontor.de/go/home/english.html Prontor GMBH].</ref> It is found on many folding cameras of the period and has the usual limitation of everset shutters that it cannot offer very fast speeds; the original Ibso shutter gives speeds from 1 to 1/100 second, plus 'B' and 'T'. |
| + | There are also IBSO shutters known that offer an extra speed of 1/150 sec. | ||
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| + | The cilinder at the top of the shutter is a pneumatic air-brake which regulates the speed. | ||
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| + | Gauthier replaced the IBSO shutter with the [[IBSOR]]. | ||
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Revision as of 07:26, 6 September 2015
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| Ibso shutter on a Romain Talbot folding camera image by John de Grooth (Image rights) |
The Ibso shutter with a 3 blade diaphragm was made by Gauthier from 1908-1926. It was the first everset shutter (i.e. an 'automatic' shutter, not needing to be cocked) on the market.[1] It is found on many folding cameras of the period and has the usual limitation of everset shutters that it cannot offer very fast speeds; the original Ibso shutter gives speeds from 1 to 1/100 second, plus 'B' and 'T'. There are also IBSO shutters known that offer an extra speed of 1/150 sec.
The cilinder at the top of the shutter is a pneumatic air-brake which regulates the speed.
Gauthier replaced the IBSO shutter with the IBSOR.
Notes
