Difference between revisions of "Crown shutter"
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The '''Crown B''' is an everset shutter giving T, B, 5–200 speeds, with the release lever on the top left. | The '''Crown B''' is an everset shutter giving T, B, 5–200 speeds, with the release lever on the top left. | ||
| − | It equips the [[Nifca and Molta plate folders#The Happy|Happy]] plate folder. On the early examples, the shutter plate is all black, engraved Patents-Nippon at the top and CROWN at the bottom with an MTS logo on the right. On later cameras, it has three metal strips on each side, is engraved PATENTS–NIPPON at the top and has no MTS logo. It has a larger aperture scale screwed to the bottom, with the name CROWN inscribed on it. | + | It equips the [[Nifca and Molta plate folders#The Happy|Happy]] plate folder. On the early examples, the shutter plate is all black, engraved ''Patents-Nippon'' at the top and ''CROWN'' at the bottom with an ''MTS'' logo on the right. On later cameras, it has three metal strips on each side, is engraved ''PATENTS–NIPPON'' at the top and has no ''MTS'' logo. It has a larger aperture scale screwed to the bottom, with the name ''CROWN'' inscribed on it. |
== Crown in #00 size == | == Crown in #00 size == | ||
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It is equipped with a small disc acting as an exposure counter. This disc advances each time the release is tripped and it can be manually reset. It is graduated from 1 to 8 with an intermediate stop between two consecutive numbers so that each number is used twice, as it appears in the red windows. The disc makes two full turns during the 16 exposures and each numbered position is shared by two numbers: 5/1, 6/2, 7/3 and 8/4. The patent for this device was filed on April 16, 1934 and published on October 13 of the same year.<REF> Patent reproduced in Tanimura, pp.5–7 of {{CCN}} no.131. An extract is also reproduced on p.19 of {{KKS}} no.12. </REF> | It is equipped with a small disc acting as an exposure counter. This disc advances each time the release is tripped and it can be manually reset. It is graduated from 1 to 8 with an intermediate stop between two consecutive numbers so that each number is used twice, as it appears in the red windows. The disc makes two full turns during the 16 exposures and each numbered position is shared by two numbers: 5/1, 6/2, 7/3 and 8/4. The patent for this device was filed on April 16, 1934 and published on October 13 of the same year.<REF> Patent reproduced in Tanimura, pp.5–7 of {{CCN}} no.131. An extract is also reproduced on p.19 of {{KKS}} no.12. </REF> | ||
| − | The Crown E only equips the [[Semi Minolta|original Semi Minolta]]. On all the examples except the very late ones, the shutter plate is black, engraved ''Patents-Nippon'' at the top, ''CROWN'' at the bottom with an ''MTS'' logo on the right. The late shutter plate is black with three metal strips on each side, engraved ''PATENT NIPPON'' at the top and ''CROWN'' at the bottom in block letters, with no MTS logo. | + | The Crown E only equips the [[Semi Minolta|original Semi Minolta]]. On all the examples except the very late ones, the shutter plate is black, engraved ''Patents-Nippon'' at the top, ''CROWN'' at the bottom with an ''MTS'' logo on the right. The late shutter plate is black with three metal strips on each side, engraved ''PATENT NIPPON'' at the top and ''CROWN'' at the bottom in block letters, with no ''MTS'' logo. |
== Other versions == | == Other versions == | ||
Revision as of 18:38, 21 April 2008
The Crown shutters were made by Molta, later Chiyoda (the predecessors of Minolta).
Contents
Crown in #0 size
The Crown A
The Crown A is supposed to exist in #0 size and to give T, B, 1–200 speeds. It is said that it was mounted on the Eaton plate folder, but no picture has been found so far.
The Crown B
|
| Crown B on a Happy, late shutter plate. Picture courtesy of eBayer hbpartner. (Image rights) |
The Crown B is an everset shutter giving T, B, 5–200 speeds, with the release lever on the top left.
It equips the Happy plate folder. On the early examples, the shutter plate is all black, engraved Patents-Nippon at the top and CROWN at the bottom with an MTS logo on the right. On later cameras, it has three metal strips on each side, is engraved PATENTS–NIPPON at the top and has no MTS logo. It has a larger aperture scale screwed to the bottom, with the name CROWN inscribed on it.
Crown in #00 size
The Crown E
 
|
| Left: Crown E with 1/100 top speed on a Semi Minolta, early shutter plate. Right: Crown E with 1/200 top speed on a Semi Minolta, late shutter plate. Pictures courtesy of eBayer hbpartner. (Image rights) |
The Crown E is an everset shutter in #00 size, with the release lever on the top left. It exists in two variants, giving first T, B, 5–100 speeds and later T, B, 5–200.
It is equipped with a small disc acting as an exposure counter. This disc advances each time the release is tripped and it can be manually reset. It is graduated from 1 to 8 with an intermediate stop between two consecutive numbers so that each number is used twice, as it appears in the red windows. The disc makes two full turns during the 16 exposures and each numbered position is shared by two numbers: 5/1, 6/2, 7/3 and 8/4. The patent for this device was filed on April 16, 1934 and published on October 13 of the same year.[1]
The Crown E only equips the original Semi Minolta. On all the examples except the very late ones, the shutter plate is black, engraved Patents-Nippon at the top, CROWN at the bottom with an MTS logo on the right. The late shutter plate is black with three metal strips on each side, engraved PATENT NIPPON at the top and CROWN at the bottom in block letters, with no MTS logo.
Other versions
To be continued.
List of cameras equipped (not exhaustive, and not implying that all the versions have a Crown shutter):
Notes
- ↑ Patent reproduced in Tanimura, pp.5–7 of Camera Collectors' News no.131. An extract is also reproduced on p.19 of Kurashikku Kamera Senka no.12.
Bibliography
- Tanimura Yoshihiko (谷村吉彦). "Semi Minolta I-gata gaibun." (セミミノルタⅠ型外聞, "Things heard about the Semi Minolta I") In Camera Collectors' News no.131 (May 1988). Nishinomiya: Camera Collectors News-sha.
- Tanimura Yoshihiko (谷村吉彦). "Supuringu kamera <semi minoruta>" (スプリングカメラ<セミミノルタ>, "Semi Minolta" self-erecting camera). Kamera Rebyū: Kurashikku Kamera Senka (カメラレビュー クラシックカメラ専科) / Camera Review: All about Historical Cameras no.12, October 1988. No ISBN number. Minoruta kamera no subete (ミノルタカメラのすべて, special issue on Minolta). Pp.19–24.
