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Pearl (I), II and III

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The name Pearl was given by Konishiroku (the later Konica) to many models of rollfilm folders. This article deals with the Pearl (I), II and III made from 1949 in 4.5×6cm format, successors of the Semi Pearl. These were replaced in 1958 by the ephemeral Pearl IV, which has a completely different construction.

Other articles deal with the early models for plates and rollfilm, the Pearl No.2, self-erecting 6×9 Pearl, and the Baby Pearl and Pearlette cameras (both using 127 film).

Operation Edit

All these Pearl models share a design quirk that is likely to confuse somebody who is moderately accustomed to other folders but is new to any in this particular line. What are obviously the shutter-release button at the top of the body and the door-opening button at the top of the door are in fact the reverse of what they seem: the photographer opens the door with the button on the top plate or top housing, and releases the shutter with the button on the opened door.

Pearl and Pearl RS, with uncoupled rangefinder Edit

The Pearl (in retrospect Pearl I, first half of 1949[1]) has the same basic body as the Semi Pearl, with a top housing (simply inscribed "Pearl") for a viewfinder and an uncoupled rangefinder. The rangefinder is set by a knob above the top housing, and the distance read must be transfered by the user to the distance scale of the lens. Film advance is still by key. The back has only one red window and is similar to the last examples of the Semi Pearl. The camera retains the combination of a coated Hexar 75mm f/4.5 lens and a Durax shutter (1–100, B, T) found on the Semi Pearl. There is still no flash synchronization.[2] Presumably "Semi" was dropped from the name in view of the unlikeliness of a revival of any 6×9 folder (the prewar 6×9 Pearl had been rather unusual among Japanese cameras even when new, and even a modernized successor would probably have struck most photographers in 1949 as a bulky extravagance); the disappearance of the Baby Pearl may have been another factor.

The Pearl RS (in retrospect Pearl I RS, but also simply inscribed "Pearl"; late 1950[3]) has a Konirapid-S shutter (B, 1–500) with Kodak-type flash synchronization. An accessory shoe is added at the top right of the camera (as seen by a photographer holding it horizontally), the back latch is modified and the strap has disappeared.[4] The price in 1951 was ¥14,850.[5]

Pearl II and IIB, with coupled rangefinder Edit

The Pearl II was released together with the Pearl RS and maybe sold a little after;[6] it is the same camera with a coupled rangefinder and inscribed Pearl II on the top housing. The focusing tab is modified and the focusing scale has disappeared from the front assembly. It is replaced by a rotating disc that shows the distance against a simple depth-of-field scale, placed under a window in the top housing, where the uncoupled model has a focusing knob for the rangefinder. In 1952[7] an f/3.5 Hexar option (¥30,150) was added to the standard f/4.5 Hexar (¥26,650). With the f/4.5 lens, the camera's dimensions open are 120×100×92mm (43mm closed); it weighs 580g.[8]

In response to increasing competition from 35mm cameras, the Pearl IIB (still engraved Pearl II) was released in mid-1955[9] as a cheaper (¥23,500) alternative to the II (¥30,150). It retains the f/3.5 Hexar lens but the shutter is a Durax-S (top speed 1/400) and the focusing scale is back to the front assembly. There is still a depth-of-field scale above the top housing, but it must be turned manually. The Pearl IIB has one innovation: a PC rather than Kodak flash terminal.[10] (At least one example of the Pearl II has been observed with this feature.)

Pearl III, with auto-stop advance Edit

The Pearl III (late 1955[11], inscribed Pearl III above the top housing) adds "semi-automatic" (auto-stop) film advance: once the "start" line on the backup paper is lined up with a dot on the film rail, the camera calculates how far the photographer may wind the film before each exposure. The red window accordingly disappears from the film back. An advance knob replaces the advance key of the previous models, it contains a manually reset exposure counter. The auto-stop mechanism was designed by Nakagawa Kenzō and supplied to Konishiroku by his company Aram Kōgaku, at a pace of 2,000 units per month.[12]

The Pearl III also substitutes a film-reminder dial (color, panchromatic, etc., as well as speed) for the distance and depth-of-field dial of the II. It retains the Konirapid S shutter of the II but has the PC flash terminal of the IIB. The lens is the Hexar f/3.5, except for a few examples said to be fitted with a three-element Konitor lens, certainly the same 75mm f/3.5 as on the Aram Six. The focusing ring is fitted with a concave tab and a depth-of-field scale.[13]

There are two later variants, which are also simply inscribed Pearl III and must be distinguished by looking at the lens. The Pearl IIIMX (1956[14]) replaces the Konirapid S with a Seikosha-MX shutter. This adds X synchronization for electronic flash, becoming popular at around this time. In a time of increased competition in the industry, companies such as Konishiroku that had previously produced shutters for their own cameras found it more economical to buy them in from either Seikosha or Copal.[15] The Hexar lens on this model has a seven-digit serial number and is said to be an improved model (maybe recomputed).[16] The Pearl IIIL (1957[17]) has two further innovations: a Seikosha-MXL shutter, using the light-value system, and a new amber coating for the lens.[18] When closed, the IIIL has the same dimensions as the II, and weighs 600g.[19]

The Pearl III was succeeded in December 1958 by the Pearl IV, which is a radical redesign of the original concept.

Notes Edit

  1. Miyazaki, p.183, says March 1949, while Tanimura, "Pāru II", says April 1949. Kokusan kamera no rekishi, p.358, says that the Pearl was tested in the August 1949 issues of Ars Camera and Kōga Gekkan.
  2. Tanaka, "Nihon no supuringu-kamera: Konishiroku", p.60. For this and subsequent models: Konika-Minoruta-ten, p.8.
  3. Tanimura, "Pāru II", and Miyazaki, p.128, both say October 1950. Kokusan kamera no rekishi, p.358, says that the Pearl RS and Pearl II are mentioned together in the November 1950 issue of Asahi Camera. The earliest advertisement is dated January 1951.
  4. Tanaka, "Nihon no supuringu-kamera: Konishiroku", pp.60–1; Uchida, "Hekisā 75mm no shikaku.
  5. Advertisement for the Pearl RS and Pearl II published in the January 1951 issue of Camera Fan, reproduced in Kokusan kamera no rekishi, p.160.
  6. Miyazaki, p.128, says that the Pearl II and Pearl RS were released in October 1950, but gives January 1951 for the Pearl II on p.183. Kokusan kamera no rekishi, p.358, says that the Pearl RS and Pearl II were mentioned together in the November 1950 issue of Asahi Camera. The earliest advertisement is dated January 1951. It is reproduced in Kokusan kamera no rekishi, p.160, and shows a price for the Pearl RS but not for the Pearl II. Uchida, "Konpakuto na Pāru RS", says that the Pearl II was released in 1951, the year after the Pearl RS.
  7. Miyazaki, p.183, says April 1952. Kokusan kamera no rekishi, p.358, says that the f/3.5 lens is first advertised in the November 1952 issue of Asahi Camera.
  8. Tanaka, "Nihon no supuringu-kamera: Konishiroku", pp.60–61; Tanimura, "Pāru II."
  9. Miyazaki, p.183, says April 1955. Kokusan kamera no rekishi, p.358, says that the Pearl IIB was reviewed in the issues dated July or August 1955 of many Japanese magazines. The first advertisements are dated August 1955.
  10. Tanaka, "Nihon no supuringu-kamera: Konishiroku", pp.60–61.
  11. Miyazaki, p.183, says December 1955. Kokusan kamera no rekishi, p.395, says that the first mention in Japanese magazines was in January 1951 issues.
  12. Sugiyama, p.76; Yazawa, p.13 of Camera Collectors' News no.254.
  13. Miyazaki, Konika kamera no 50nen, p.129 (the source for examples with Konitor lenses); Tanaka, "Nihon no supuringu-kamera: Konishiroku", p.61. All Konitor lenses have three elements, see Yazawa in Camera Collectors' News no.254.
  14. Kokusan kamera no rekishi, p.395, says that it was featured in the new products column of the May 1956 issue of Camera Mainichi.
  15. Tanaka, "Nihon no supuringu-kamera: Konishiroku", p.61.
  16. Miyazaki, p.131.
  17. Kokusan kamera no rekishi, p.395, says that it was featured in the new products column of the June 1957 issue of Nippon Camera.
  18. Miyazaki, Konika kamera no 50nen, p.129; Tanaka, "Nihon no supuringu-kamera: Konishiroku", p.61.
  19. Kawamata, p.98.

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