Single-lens Reflex Camera
- camera that uses a semi-automatic moving mirror system which permits the photographer to sometimes see exactly what will be captured by the film or digital imaging system
- cameras allow the photographer to see the precise focus, color, framing, and brightness that will be recorded on film
Optical components of an SLR camera 1 - Front-mount lens 2 - Reflex mirror at 45degrees 3 - Focal plane shutter 4 - Film or sensor 5 - Focusing screen 6 - Condenser lens 7 - Optical glass pentaprism 8 - Eyepiece
- Johann Sturm (Germany) described first known use of a reflex mirror in a camera obscura.
- The camera obscura was known to Aristotle as an aid in observing solar eclipses, but its use as an artist's aid
- Used glass plates or sheet film
- first focal-plane shutter SLR
- first medium format roll film SLR
- first pentaprism eyelevel viewing 35 mm SLR
Further Development of SLR
- describes large photographic films, large cameras, view cameras and processes that use a film or digital sensor, generally 4 x 5 inches or larger.
- have adjustable fronts and backs that allow the photographer to better control rendering of perspective and depth of field.
Large format SLR
- allow the front and/or back of the camera to be tilted out of parallel with each other, and to be shifted up, down, or sideways.
Medium format SLR
- cameras making use of sensors larger than that of a 35 mm film frame
- most widely used film size to a niche used by many professionals and some amateur enthusiasts
Medium format SLR
- images of much higher resolution can be produced
- usually limited to professional photography shops and very expensive
- viewing and focusing the image through the attached lens
- provide photographers with precision and confidence
- no parallax error, and exact focus can be confirmed by eye
- cannot be made as small or as light as other camera designs
- simple designs for wide angle lenses cannot be used
- SLR mirror 'blacks-out' the viewfinder image during the exposure