View source for Mamiya X-30

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The '''X-30''' is a camera for recording X-ray images on a fluorescent screen, made by [[Mamiya]] in the 1950s. It is a rather simple metal camera body, with brushed-chrome top and bottom plates and leatherette covering; there is no shutter, just a dark slide inserted in a slot in the top plate of the camera body. In practice the exposure might be controlled by the opening and closing of the X-ray source in its instrument. The lens is a 6.5cm f/1.4 Roentgen-[[Zunow]], mounted in a plate to fasten over the screen of the X-ray machine, and with a fine-focusing control but no iris diaphragm. Clearly, no viewfinder is required. The camera body attaches to the back of the lens with a bayonet. Examples seen at Leitz/Westlicht sales comprise the lens, two camera bodies and ten film cassettes (branded by [[Canon]] in an early example; by Mamiya in the later one) in a wooden outfit case fitted to exactly this set.<ref name=LPA40>[https://www.leitz-auction.com/en/Mamiya-X-30-X-Ray-Camera-outfit-Roentgen-Zunow-1.4-65mm/AI-40-40209 X-30 outfit] comprising Roentgen-Zunow lens serial no.60351, two camera bodies serial nos. 6422 and 6428, and ten Canon film cassettes in a wooden case, sold at the [https://www.leitz-auction.com/en/Cameras/Past-Auctions/Auction-40/ 40th Leitz Photographica Auction], in June 2022.</ref><ref name=LPA36>[https://www.leitz-auction.com/en/Mamiya-X-30-X-Ray-Camera-outfit-Roentgen-Zunow-1.4-65mm/AI-36-38345 X-30 outfit] with Roentgen-Zunow serial no.60861, two camera bodies serial nos.581467 and 581524 (surely implying a date of 1958) and Mamiya film cassettes, in a wooden outfit case, sold at the [https://www.leitz-auction.com/en/Cameras/Past-Auctions/Auction-36/ 36th Leitz Auction], in June 2020.</ref>

The earlier camera body has an advance knob with a chain wrapped around it, allowing it to be advanced (once) by pulling a string tied to the chain, from behind an X-ray protection screen.<ref name=LPA40/> The later camera has a very large-diameter cylinder at the uptake end, which must surely house a spring-motor advance.<ref name=LPA36/> It also has olive-drab leatherette; the earlier camera's is black. There is a frame-counter scaled up to 50; the exposed frame is square. There is a simple crank for rewinding.

Seiki Kōgaku ([[Canon]]) had made a rather similar [[Canon X-ray camera|X-ray camera]], sold in similar outfits, from some time in the 1930s, as did [[Rubicon#Rubikon_and_Rubicon|Rokuoh-Sha]] (Konshiroku/Konica).

==Notes==
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[[Category:Mamiya]]
[[Category:X|X-30]]
[[Category:35mm magazine back]]
[[Category:Medical cameras]]
[[Category:Japanese 35mm]]