Common aspect ratios in still photography include:
1:1
4:3 (1.33:1)
3:2 (1.5:1)
5:3 (1.66:1)
16:9 (1.77:1)
3:1
Many agenda still cameras action user options for selecting assorted angel aspect ratios. Some accomplish this through the use of multi-aspect sensors (notably Panasonic), while others artlessly crop their built-in angel architecture to accept the achievement bout the adapted angel aspect ratio.
edit1:1
is the archetypal aboveboard image, and is accessible as a best in some agenda still cameras, and harkens aback to the canicule of blur cameras if the aboveboard angel was somewhat accepted with photographers application average architecture cameras cutting 120 blur formed assimilate spools. The 6 × 6 cm angel admeasurement was the archetypal 1:1 architecture in the contempo past. 120 blur can still be begin and acclimated today.
edit4:3
is acclimated by a lot of agenda point-and-shoot cameras, Four Thirds system, Micro Four Thirds arrangement cameras and average architecture 645 cameras. The 4:3 agenda architecture acceptance was developed to bout the again prevailing agenda displays of the time, 4:3 computer monitors.
The next several formats accept their roots in archetypal blur photography angel sizes, both the archetypal 35 mm blur camera, and the assorted architecture Advanced Photo Arrangement (APS) blur camera. The APS camera was able of selecting any of three angel formats, APS-H ("High Definition" mode), APS-C ("Classic" mode) and APS-P ("Panoramic" mode).
edit3:2
is acclimated by archetypal 35 mm blur cameras application a 24 mm × 36 mm angel size, and their agenda derivatives represented by DSLRs. Typical DSLRs appear in two flavors, the alleged able "full frame" (24 mm × 36 mm) sensors and variations of smaller, so alleged "APS-C" sensors. The appellation "APS" is acquired from addition blur architecture accepted as the APS and the "-C" refers to "Classic" mode, which apparent images over a abate breadth (25.1 mm × 16.7 mm) but application the aforementioned "classic" 3:2 accommodation as abounding anatomy 35 mm blur cameras.
When discussing DSLR's and their non-SLR derivatives, the appellation APS-C has become an about all-encompassing term. The two above camera manufacturers Canon and Nikon anniversary developed and accustomed sensor standards for their own versions of APS-C sized and ample sensors. Canon in fact developed two standards, APS-C and a hardly beyond breadth APS-H (not to be abashed with the APS-H blur format), while Nikon developed its own APS-C standard, which it calls DX. Regardless of the altered flavors of sensors, and their capricious sizes, they are abutting abundant to the aboriginal APS-C angel size, and advance the archetypal 3:2 angel accommodation that these sensors are about accepted as an "APS-C" sized sensor.
The acumen for DSLR angel sensors getting the adulate 3:2 against the taller point-and-shoot 4:3 is that DSLRs were advised to bout the bequest 35 mm SLR film, admitting the majority of agenda cameras were advised to bout the absolute computer displays of the time, with VGA, SVGA, XGA and UXGA all getting 4:3. Widescreen computer monitors did not become accepted until the appearance of HDTV which uses a 16:9 angel aspect ratio.
edit16:9
16:9 is addition architecture that has its roots in the APS blur camera. Accepted as APS-H (30.2 mm × 16.7 mm), with the "-H" cogent "High Definition", the 16:9 architecture is aswell the accepted angel aspect arrangement for HDTV. 16:9 is accepting acceptance as a architecture in all classes of customer still cameras which aswell shoot High Definition (HD)video. If still cameras accept an HD video capability, some can aswell almanac stills in the 16:9 format, ideal for affectation on HD televisions and widescreen computer displays.
edit3:1
is addition architecture that can acquisition its roots in the APS blur camera. Accepted as APS-P (30.2 × 9.5 mm), with the -P" cogent "Panorama", the 3:1 architecture was acclimated for panorama photography. The APS-P panorama accepted is the atomic adhered to of any APS standard, and across-the-board accomplishing varies with by architect on altered cameras, with the alone commonality getting that the angel is abundant best than it is tall, in the archetypal "panorama" style.
Common book sizes in the U.S. (in inches) cover 4×6 (1.5), 5×7 (1.4), 4×5 and 8×10 (1.25), and 11×14 (1.27); ample architecture cameras about use one of these aspect ratios. Medium-format cameras about accept architecture appointed by nominal sizes in centimeters (6×6, 6×7, 6×9, 6×4.5), but these numbers should not be interpreted as exact in accretion aspect ratios. Book sizes are usually authentic by their account ambit (tall) while accessories aspect ratios are authentic by their mural ambit (wide, addled sideways). A acceptable archetype of this a 4×6 book (6 inch advanced by 4 inch alpine landscape) altogether matches the 3:2 aspect arrangement of a DSLR/35 mm, back 6/2=3 and 4/2=2.
For analog bump of accurate slides, projector and awning use a 1:1 aspect ratio, acknowledging accumbent and vertical acclimatization appropriately well. In contrast, agenda bump technology about supports angular aggressive images alone at a atom of the resolution of landscape-oriented images. For example, bulging a agenda still angel accepting a 3:2 aspect arrangement on a 16:9 projector employs 84.3% of accessible resolution in accumbent orientation, but alone 37.5% in vertical orientation
