Canda Technologies shut down in the late '80's, but Jack Newton's company Northern Lites popped up to take up the slack. Jack has since removed himself from the cold camera manufacturing scene, the only remaining source of these gems is at swap tables at star parties. The above photo shows the major parts of the Canda Technologies camera. A Cut-away side view drawing of the camera is available here. The aluminum part on the left is threaded for filters.
Film is pressed against a brass cooling plate in the lid of the camera by the optical plug.
The other side of the cooling plate is the dry ice chamber, with a threaded plunger as seen in the photo and cut-away drawing. Lower left, the knife-edge focusing tool. This plexiglass disc sits on top of the optical plug for focusing, focusing is done with the beveled edge running down the middle of the disc. I find a 36mm plossl makes a great finder eyepiece. The camel-hair brush and compressed air are used to keep the optical plug surface clean.