<P> The TLR camera was thus an evolution . Using a reflex mirror to allow viewing from above also enabled the camera to be held much more steadily than if it were to be held in the hand . The same principle of course applied to SLR cameras , but early SLR cameras caused delays and inconvenience through the need to move the mirror out of the focal plane to allow light to pass to the plate behind it . When this process was automated , the movement of the mirror could cause shake in the camera and blur the image . The London Stereoscopic Co 's `` Carlton '' model is claimed to have been the first off - the - shelf TLR camera , dating from 1885 . </P>
<P> The TLR camera was thus an evolution . Using a reflex mirror to allow viewing from above also enabled the camera to be held much more steadily than if it were to be held in the hand . The same principle of course applied to SLR cameras , but early SLR cameras caused delays and inconvenience through the need to move the mirror out of the focal plane to allow light to pass to the plate behind it . When this process was automated , the movement of the mirror could cause shake in the camera and blur the image . The London Stereoscopic Co 's `` Carlton '' model is claimed to have been the first off - the - shelf TLR camera , dating from 1885 . </P>
when was the twin lens reflex camera invented
when was the twin lens reflex camera invented
1885
1885