Crop factor
Videos
In digital photography, the crop factor, format factor, or focal length multiplier of an image sensor format is the ratio of the dimensions of a camera's imaging area compared to a reference format; m
The outer, red box displays what a 24×36 mm sensor would see, the inner, blue box displays what a 15×23 mm sensor would see. (The actual image circle of most lenses designed for 35 mm SLR format would extend further beyond the red box than shown in the above image.)
An APS-C format SLR (left) and a full-frame DSLR (right) show the difference in the size of the image sensors.
Some manufacturers provide both the real focal length and the 35 mm equivalent focal length
APS-C
Videos
Advanced Photo System type-C is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C format, of 25.1×16.7 mm, an aspect ratio of 3:2 and Ø 30.15
Crop factor
…is fixed by its optical construction and does not change with the format of the sensor that is put behind it. Most DSLRs on the market have nominally APS-C-sized image sensors, smaller than the standard 36 × 24 mm (35 mm) film frame. The result is that the image sensor captures image data from a smaller…
Canon EF-S lens is compatible with Canon's APS-C digital SLRs