The Crystar Flex is a moderate-priced Japanese TLR using a geared coupling between the focusing and taking lenses. It was the first camera made by the Crystar Optical Company, in about 1953. The original model has a simple printed name plate, and no sportsfinder in its viewing hood. Its shutter speed range is 1/10-1/200 second.
The slightly improved Crystar Flex IIA followed in 1954. This has a more substantial molded name plate, and a viewing hood with sportsfinder openings. Its shutter gained slow speeds to 1 second, missing on the earlier version. The shutter carried an ASA style sync post on its side (different from the front panel PC socket of the Crystar 25 AII).
- McKeown, James M. and Joan C. McKeown's Price Guide to Antique and Classic Cameras, 12th Edition, 2005-2006. USA, Centennial Photo Service, 2004. ISBN 0-931838-40-1 (hardcover). ISBN 0-931838-41-X (softcover). p231.