quarta-feira, 1 de maio de 2013

HISTÓRIA DA MAMIYA PRESS C 23

The Mamiya Press is a unique camera by any definition. The first model was released in 1960 and as the name would indicate, was geared toward news and press photography. The much larger 4?x5? Graflex Speed Graphic was the workhorse of the press corps in the 1930s and 1940s, so the Mamiya Press could probably be regarded as a next generation press camera. It is certainly a strange looking camera. It doesn’t look like a field camera or a folder with the trademark bellows right behind the lens. But it also doesn’t look anything like an SLR. It takes medium format film, both in sheets (which are no longer sold in that size) and roll (120 and 220). The Mamiya Press is a medium format rangefinder camera system designed to accept interchangeable backs and lenses. Mamiya made a number of variants to the basic body design, including one model, the 600SE, that was licensed to be marketed under the Polaroid name. The camera body itself is a simple affair, with a single-window combined range- and view-finder that couples to the lens for focusing. It has tripod mounts in both vertical and horizontal positions, a mount for a handgrip for the left hand, and cold shoes on both the body and the handgrip. Lenses produced were: ¦ 50mm f/6.3 - 8 elements in 5 groups (Biogon type) ¦ 65mm f/6.3 - 4 elements in 4 groups (similar to the Wide Field Ektars or Bausch & Lomb Metrogon) ¦ 75mm f/5.6 - 7 elements in 4 groups (Biogon type) ¦ 90mm f/3.5 - 4 elements in 3 groups (Tessar type) ¦ 100mm f/3.5 - 4 elements in 3 groups (Tessar type) ¦ 100mm f/2.8 - 6 elements in 4 groups (Gauss type) ¦ 127mm f/4.7 - 4 elements in 3 groups (Tessar type) ¦ 150mm f/5.6 - 4 elements in 3 groups (Tessar type) ¦ 250mm f/8 (not rangefinder coupled) ¦ 250mm f/5 - 6 elements in 4 groups (Sonnar type) Film Backs & Accessories Two different types of back exist for the Mamiya Press, the Graflex back, and the Mamiya Back, or G-type and M-types. The backs are incompatible with each other, and Press cameras came in versions for either one back or the other. The Super 23 only accepted Mamiya (M-type) backs. The Mamiya Universal had interchangeable rear adapters - the M adapter and the G adapter. Thus, the Universal was capable of using both Mamiya and Graflex backs, as long as one had the appropriate adapter. The Universal also accepted a Polaroid back; this needed no adapter and attached directly to the main camera body. Mamiya film backs include 6x9, 6x7, a combination 6x4.5-6x6-6x9 back, and Polaroid packfilm backs. Accessory backs for 2.5 x 3.5 inch (6.5x9cm) sheet film and plates include a right angle focusing back, a magnifying focusing back and a ground glass viewing back. Other accessories include a wire frame sportsfinder, separate finders for the 50mm, 65mm, and 75mm lenses, back spacers and extension tubes. Mamiya Press Models by Bob Hutchinson Mamiya Press Models - Some Explained Early Mamiya Press models: Standard with bellows back and Standard 23 without bellows, small cavity, twist in bayonet lens mount with notch latch, and simple split image rangefinder/viewfinder with sliding/attaching mask arrangements for different lenses, limited parallax correction. Large majority of these models came with Mamiya back, a few with Graflex Graflok back. Changing backs possible on the Standard 23 by removing 4 screws. More difficult on the Standard because the bellows is glued to the back. The bellows back allows some close-up work and it allows the user to point the camera up and keep the film plane perpendicular to the ground and parallel to vertical subjects to avoid converging vertical lines and subjects. Limit, I believe, is about 10 degrees. This usually requires use of the ground glass back. I avoid the bellows camera to avoid the possible associated light leaks. Super 23 Model: Came later and had the Standard bellows back, small cavity, newly designed front, sophisticated rangefinder/viewfinder with changeable bright frames for 100mm, 150mm & 250mm lens, auto parallax correction, with lock ring style lens mount, no notch latch. Majority of Super 23 models came with Mamiya back, a few with Graflex Graflok back. Changing backs not practical unless bellows is re-glued to back. (If the back can be removed without tools it is called an adapter. Hence, the Universal (below) has an adapter, previous models do not.) Universal, last model: Same front, viewfinder/rangefinder and lens mount as the Super 23, much larger cavity to accommodate the Polaroid 3 1/2" x 4 1/2" format (picture size actually a bit smaller), easily removable and interchangeable back adapter system similar to the Graflex XL system. Back system originally comprised the "M" adapter for Mamiya accessories, horizontal format, "P" adapter for Mamiya accessories, vertical format, "G" adapter for Graflex accessories and Polaroid back, horizontal format. Other limited production after-market items became available also. A few attempts were made at using 4x5 back accessories on the Universal and Graflex XL in conjunction with lenses to cover 4x5 and mounts and a spacing arrangement for the 4x5 back adapter. Without this mechanical arrangement and the 4x5 accessories spaced back about an inch, 4x5 coverage was not possible. Today, it would be nice if the Universal would cover the 6x12 format - Can't happen, body just not big enough and only two of the entire line-up of Mamiya press lenses will just barely cover 6x12. They are the 75mm f5.6 and the 127mm f5.6, both of which were designed and marketed with the later black Universals for Polaroid use. These two lenses are the latest and best designs for the Mamiya press system. The 75mm appears to be a copy of the Schneider Angulon. It covers 6x12 but has severe corner light fall off when used with the 4x5 format. About the true 6x9 roll film backs: The 6x9 designation actually refers to the opening in the back end of the camera body that the back matches and I believe the Industry just referred to the backs in a similar manner. The Horseman back is 3 1/4" or 8.25 cm. The Graflex roll film back that we call 6x9 is actually 3 1/16" wide. I have written about this earlier and it's still confusing. Flat Top: Even though I had a lot of fun building the Flat Top, I recommend the use of the Universal and the later lenses, 50mm, 75mm 100mm f3.5 ,black, 127mm, late 150mm black and the 250mm. The only reason I started the project was because the viewfinder/rangefinder was smashed.. The only advantage of a Flat Top is weight and size reduction. Some of the finders one would use on a flat top are really bright with a BIG image which is superior to the dim view finders on any of the Mamiya press models.

RESTAURAÇÃO DA MAMIYA PRESS C 23



Quando eu comprei em Março de 2013, a Mamiya Press C 23, na feirinha da Pç XV, no Rio, ela estava em péssimo estado e faltando muitos ítens.

Iniciei a desmontagem completa da máquina , fotografando cada peça que retirava, tomando cuidado para não perder nenhum parafuso sequer.

Começei uma pesquisa intensapara encontrar através da internet, o que faltava na máquina para poder completá-la .
Comprei de uma só vez, o PUNHO, o VIEW esportivo, Um Back Espolido, uma nova Lente .

Depois, conseguí no ML, comprar uma câmera igual, toda desmontada, o que serviu muito para trocar peças melhores .

O grande trabalho seria encontrar o FLASH orinal da Mamiya Press C 23 ... foi uma busca intesa, mas finalmente encontrei, em muito bom estado e na caixa original .

Isolei toda a máquina com muito cuidado, para fazer a pintura.

Criei uma técnica para colar a "lombada" do fole, com dois palitos grandes, prensados entre si .
Enfim . completei a restauração no final de Abril de 2013 .