APS-C sensor 和 DSLR sensor

APS 全名是 Advanced Photo System,在菲林時代後期的一種產品,片幅比135格式細,可以唔駛一次過用晒一筒菲林,用唔完可以回捲收埋,第二時再用過.
來到數碼年代又分成APS-C或者APS-H
APS-C範指1.5至1.7倍焦距增長的DSLR sensor.大小
APS-H則指1.3倍焦距增長的DSLR sensor大小
Full frame即係36 x 24mm,等於以前135格式菲林的大小
Also called "APS-C". Many variants exist. APS-C film measures 25.1 x 16.7 mm, Sony's APS-C measures 21.5 x 14.4 mm, Nikon "DX" sensors measure 23.7 x 15.7 mm, while Canon has several (smaller and larger) variants, e.g. 22.2 x 14.8 mm and 28.7 x 19.1 mm.

DSLR的全名係Digital single lens reflex,即係數碼單鏡反光機.