Editing Twin-lens reflex camera (section)

==Film formats==
[[File:Shop instantflex-tl70 b1(c).jpg|thumb|Instantflex TL70]]
[[File:Gemflex.jpg|thumb|Gemflex twin lens reflex camera]]
[[File:Goerz Minicord III front view.jpg|thumb|Goerz Minicord III twin lens reflex 16&nbsp;mm camera]]
[[File:Tessina3.jpg|thumb|Tessina TLR]]
[[File:Sharan Rolleiflex 1.JPG|thumb|Sharan Rolleiflex 2.8F TLR Minox film camera]]

===6×6 format===
The typical TLR is [[Medium format (film)|medium format]], using [[120 film|120]] [[roll film]] with square {{nowrap|6 cm × 6 cm}} images. Presently, the Chinese [[Seagull Camera]] is still in production along with Lomography's Lubitel, but in the past, many manufacturers made them.  DHW-Fototechnik GmbH continues to make the Rolleiflex TLR as well.<ref>{{cite web|url=http://www.dhw-fototechnik.de/en/rolleiflex-tlr.html|title=Rolleiflex Twin-Lens Reflex|website=www.dhw-fototechnik.de|access-date=10 April 2018}}</ref> The Ciro-flex, produced by Ciro Cameras Inc., rose dramatically in popularity due in large part to the inability to obtain the German Rollei TLRs during World War II.  The Ciro-flex was widely accessible, inexpensive, and produced high quality images.<ref>Mike Roskin, "Occam's Ciroflex," ''Camera Shopper'', May, 1995, 38.</ref>  Models with the [[Mamiya]], [[Minolta]] and [[Yashica]] brands are common on the used-camera market, and many other companies made TLRs that are now classics. The Mamiya C series TLRs had interchangeable lenses, allowing focal lengths from 55&nbsp;mm (wide angle) to 250&nbsp;mm (telephoto) to be used. The bellows focusing of these models also allowed extreme closeups to be taken, something difficult or impossible with most TLRs. The simple, sturdy construction of many TLRs means they have tended to endure the years well. Many low-end cameras used cheap shutters however, and the slow speeds on these often stick or are inaccurate.

===127 format===
There were smaller TLR models, using [[127 film|127]] [[roll film]] with square {{nowrap|4 cm × 4 cm}} images, most famous the "Baby" [[Rolleiflex]] and the Yashica 44. The TLR design was also popular in the 1950s for inexpensive [[fixed focus]] cameras such as the [[Kodak Duaflex]] and [[Argus 75]].

===35&nbsp;mm format===
Though most used medium format film, a few 35&nbsp;mm TLRs were made, the very expensive [[Contaflex TLR]]<ref>{{cite web| url=http://elekm.net/pages/images/Contaflex-tlr.jpg | title=Contaflex camera | access-date=2024-02-08}}</ref> being the most elaborate, with interchangeable lenses and removable backs. The LOMO Lubitel 166+, a natively medium format camera, comes with an adapter for 35&nbsp;mm film. As do most Rolleiflex models with their respective Rolleikin 35mm adapter. Furthermore the Yashica 635 was made specifically for use with 120 and 135 film and was shipped with the appropriate adapters.

===Instant film format===

The only twin lens reflex camera that uses instant film is Instantflex TL70 manufactured by [[MiNT camera|MiNT Camera]] which is compatible with [[Instax|Fuji instax mini film]] (film size {{nowrap|54 mm × 86 mm}}, picture size {{nowrap|46 mm × 62 mm}}) . It is the world's first instant twin lens reflex camera.

===Subminiature format===
[[Gemflex]] is a subminiature twin lens reflex camera made by Showa Optica Works (昭和光学精機) in occupied Japan in the 50s.<ref>William White Subminiature Photography p108, Focal Press 1990</ref> Gemflex resembles the well known  Rolleiflex 6×6 twin lens reflex, but much smaller in size. The body of Gemflex is die cast from shatter proof metal.<ref>Popular Science - Apr 1954 - Page 196</ref>

The smallest photography TLR camera using 35&nbsp;mm film is the Swiss-made [[Tessina]], using perforated 35&nbsp;mm film reloaded into special Tessina cassette, forming images of {{nowrap|14 mm × 21 mm}}.

[[Goerz Minicord]] twin lens reflex made {{nowrap|10 mm × 10 mm}} format on double perforated 16&nbsp;mm film in metal cassette. 6 Element Goerz Helgor F2 lens, metal focal plane shutter B, 10, 25, 50, 100, and 400. Viewing lens uses pentaprism reflex optics for the viewing lens. Picture format {{nowrap|10 mm × 10 mm}} on double perforated 16&nbsp;mm film.

Minox rebadged Sharan Rolleflex 2.8F classic retro TLR film camera, 1/3 scale 6x6 Rolleiflex TLR, using Minox cassette image size {{nowrap|8 mm × 11 mm}}, 15&nbsp;mm F5.6 glass triplet lens, mechanical shutter 1/250 sec.

Japan made Gemflex, a twin lens reflex using 17.5&nbsp;mm paper back roll film.

It has been argued that the medical gastroscopy camera, the Olympus Gastro Camera<ref>{{cite web|url=http://www.tlr-cameras.com/misc/Gastro.htm|title=Olympus Gastro Camera|website=www.tlr-cameras.com|access-date=10 April 2018}}</ref> is technically the smallest TLR device.