Mamiya C33 Professional is an interchangable lens TLR camera manufactured by Mamiya and produced between 1965-69.
Mamiya C series is a professional level of TLR medium format cameras.
They have interchangeable lens system. This feature is on very few TLR cameras like Contaflex TLR and Koni-Omegaflex.
Bellows focusing allows extreme close up photography, which is not easy with other TLRs.
Auto cocking of the shutter feature is existent only on the C33 and the C330 series cameras.
Pointer in the viewfinder shows exposure increase which metered a hand posemeter, as bellows are extended and,
Auto Parallax correction scale for the lens beeing used (for this purpose the parallax correction lever must be set as to the lens, left side of the camera)
Focus knobs: two, bilateral, on the lowest front side of the camera
Finder lens: (in the pictures) Mamiya-Sekor 180 mm, f/4.5
Shutter: (in the pictures)  Seiko MX; Speeds: 1-1/500 +B, settings on the lens-shutter assembly
Shutter release button: right lower front side of the camera, only works after film advance and operate once when Multiple exposure/film stop selector must be on Rollfilm (double exposure prevention), w/ cable release socket
Shutter releasing is also possible by the lever on the Lens-Shutter assembly
Caution: If there is no film in the camera the Shutter release button do not work, even with the shutter cocked
Winding lever: also auto cocking of the shutter on the lens by an advance stroke, right side of the camera
The shutter can be cocked by a lever on the lens/shutter assembly, but no film advance.
Multiple exposure / film stop selector: in front of the winding lever,
Viewfinder: (in the pictures) Porroflex finder Pat.Pend. M, eye level reflex mirror, image in correct orientation, manufactured by Nippon Kogaku (Nikon), Japan, Tokyo, an early version
Interchangeable such as Waist level, Metered CDS Porrofinder, Prism finder and some others
Standart finder is Waist level finder.
Frame counter: left side, advance type, resets via opening the back cover
Flash PC socket: on the lens-shutter assembly, beneath right side of the finder lens
Flash sync: M, X, via a lever on the lens-shutter assembly
Back cover: removable, w/ red window and built-in lid, to ascertain whether or not the camera contains film
Tripod socket: 1/4"
Body: steel, very solid as rock; Weight: +2 kilograms
↑There is different objectives between 55mm and 250mm which can be divided roughly into two series as chrome and black. The chrome series heve three different Seikosha shutters as MX, S and SLV. The black series have Seiko shutter. The only exception is black 80mm f//3.7 which has Copal shutter. The Seikosha-MX's max speed is 1/400, all the others 1/500. In general all variations fit on all cameras.