Editing Single-lens reflex camera (section)

== Film formats ==
{{Main|Film format}}

Early SLRs were built for [[large format]] photography, but this film format has largely lost favor among professional photographers. SLR film-based cameras have been produced for most [[film format]]s as well as for digital formats. These film-based SLRs use the [[135 film|35&nbsp;mm format]] as, this film format offers a variety of emulsions and film sensitivity speeds, usable image quality and a good market cost. 35&nbsp;mm film comes in a variety of exposure lengths: 20 exposure, 24 exposure and 36 exposure rolls. [[Medium format (film)|Medium format]] SLRs provide a higher-quality image with a negative that can be more easily retouched than the smaller 35&nbsp;mm negative, when this capability is required.

A small number of SLRs were built for [[Advanced Photo System|APS]] such as the Canon IX series and the Nikon Pronea cameras. SLRs were also introduced for film formats as small as Kodak's [[110 film|110]], such as the [[Pentax Auto 110]], which had interchangeable lenses.
[[File:White Narciss camera.JPG|thumb|right|upright=1.36|16&nbsp;mm SLR Narciss camera]]
The [[Narciss camera]] is an all-metal 16&nbsp;mm subminiature single lens reflex camera made by Russian optic firm Krasnogorsky Mekhanichesky Zavod (KMZ) Narciss (Soviet Union; Нарцисс) between 1961 and 1965.