Semi

From Camerapedia.org

Japanese Semi (4.5×6)
Prewar and wartime models (edit)
folding	Semi Ace | Adler | Semi Ako | Ami | Bakyna | Semi Chrome | Semi Clover | Collex | Semi Condor | Semi Dymos | Semi Elega | Semi First | Auto Semi First | Baby Semi First | Gaica | Semi Gelto | Semi Germa | Hansa Semi Rollette | Heil | Hokoku | Hope | Kadera | Kankyu | Semi Kelly | Kiko Semi | Semi Kinka | Semi Konter | Semi Kreis | Semi Kulax | Semi Lead | Semi Leotax | Semi Lester | Loyal | Semi Lucky | Semi Lyra | Semi Makinet | Semi Metax | Semi Minolta | Auto Semi Minolta | Semi Miss | Mizuho | Semi Mulber | Semi National | New Gold | Okaco | Oko Semi | Semi Olympus | Semi Olympus II | Semi Osamo | Semi Pearl | Primo | Semi Prince | Semi Proud | Semi Prux | Roavic | Semi Rody | Rondex | Semi Rosen | Semi Rotte | Seica | Seves | Semi Shiks | Sintax | Semi Sixteenth | Semi Solon | Semi Sport | Star Semi | Semi Tex | Tsubasa Kiko Three | Tsubasa Nettar | Tsubasa Super Semi | Ugein | Vester-Lette | Victor | Waltax | Wester | Zeitax
collapsible	Semi Kinsi | Lord | Lyrax | Nippon | Semi Olympic | Semi Renky | Auto Victor | Well Super
stereo	Sun Stereo
unknown	Semi Elka | Semi Keef | Napoleon
Postwar models (edit)
folding	Apollo | Semi Blond | Semi Crystar | Daido Semi | Doris | Semi Frank | Semi Golder | Karoron | Karoron RF | Kiko Semi | Korin | Kuri | BB Kuri | Lark | Semi Leotax | Lo Ruby | Luck | Semi Lyra | Semi Masmy | Middl 120 | Semi Mihama | Mikado | Million Proud | Semi Minolta III | Semi Minolta P | Semi Oscon | Semi Pearl | Pearl I–IV | Petri | Petri RF | Petri Super | Pioneer | Semi Proud | Semi Rocket | Rocky Semi | Rosen | Ruby | Shinkoh Rabbit | Semi Sport | Tsubasa Semi | Union Semi | Union Model U | Walcon Semi | Waltax | Semi Wester | Zenobia
rigid or collapsible	Semi Dak | Semi Hobix | Super Semi Plum | Rocket Camera | Tomy
Japanese SLR, TLR, pseudo TLR and stereo models ->
Japanese 3×4 and 4×4, 4×5 and 4×6.5, 6×6 and 6×9 ->

In Japan, the Semi format (セミ判) is the 4.5×6cm format, giving 16 exposures on 120 film. The word "Semi" (セミ) often appears in the names of older Japanese 4.5×6 cameras. Most of these are folders: see the page about the Japanese 4.5×6 folders. There is also a handful of models with a rigid body and a telescopic lens, made in the late 1930s and early 1940s.

The word Semi was abandoned for camera names in the 1950s, together with the disappearance of the 4.5×6 models. The format was revived in 1975 with the Mamiya M645, and the term "645" has since been used in many camera names, like the Fujica GS645 and GW645, Pentax 645, Contax 645 and Bronica RF645.