Editing Twin-lens reflex camera (section)

==Features==
[[File:Rolleiflex camera.jpg|thumb|right|The classic [[Rolleiflex]] TLR]]
Higher-end TLRs may have a pop-up magnifying glass to assist the user in focusing the camera. In addition, many have a "sports finder" consisting of a square hole punched in the back of the pop-up hood, and a knock-out in the front. Photographers can sight through these instead of using the matte screen. This is especially useful in tracking moving subjects such as animals or race cars, since the image on the matte screen is reversed left-to-right. It is nearly impossible to accurately judge composition with such an arrangement, however.

[[Mamiya]]'s C-Series, introduced in the 1960s, the C-3, C-2, C-33, C-22 and the [[Mamiya C330]] and [[Mamiya C220]] along with their predecessor the Mamiyaflex,<ref>{{cite web|url=http://www.tlr-cameras.com/Japanese/Mamiya.html|title=WWW.TLR-CAMERAS.COM/Mamiya|website=www.tlr-cameras.com|access-date=10 April 2018}}</ref> are the main conventional TLR cameras to feature truly interchangeable lenses.<ref>However, the (6×6&nbsp;cm) Koniflex (from [[Konica]]) is one of several others sold in small volumes to have a ''supplementary'' tele lens, and the (6×7&nbsp;cm) Koni-Omegaflex (cited above) can be used as a TLR with an optional finder and has interchangeable lenses.</ref> "Bayonet-mount" TLRs, notably Rolleis & Yashicas, had both wide-angle and tele supplementary front add-ons, with Rollei's Zeiss Mutars being expensive but fairly sharp. Rollei also made separate TLRs having fixed wide-angle or tele lenses: the Tele Rollei and the Rollei Wide, in relatively limited quantities; higher sharpness, more convenient (faster than changing lenses) if one could carry multiple cameras around one's neck, but much more costly than using 1 camera with supplements. The Mamiya TLRs also employ [[bellows]] focusing, making extreme closeups possible.

Many TLRs used front and back cut-outs in the hinged top hood to provide a quick-action finder for sports and action photography. Late model [[Rollei]] [[Rolleiflex]] TLRs introduced the widely copied additional feature of a second-mirror "sports finder". When the hinged front hood knock-out is moved to the sports finder position a secondary mirror swings down over the view screen to reflect the image to a secondary magnifier on the back of the hood, just below the direct view cutout. This permits precise focusing while using the sports finder feature. The magnified central image is reversed both top-to-bottom and left-to-right.  This feature made Rolleis the leading choice for press photographers during the 1940s to 1960s.<ref>Ian Parker:  Complete Rollei Collector's Guide, 1993</ref>