What do you mean by APS format, DX format and FX Quan Huafu?

APS frame refers to the size of the imaging area. Generally, the imageable area of APS film or CCD is 16.7mm? x？ About 30.2 mm It's just 1/2 of the whole frame or the size between them.

DX format is Nikon's name for its APS-C format system. For example, both D200 and D80 are called DX format cameras, and the lens with DX in it is named as the lens suitable for this system.

FX Quan Huafu: That means Nikon Quan Huafu.

APS-C(DX)= 23.6 x 15.8 = 372.88？ square millimeter

FX=？ 36x24=864？ square millimeter

APS system is a traditional film photography system introduced by Kodak in conjunction with Fuji, Canon and other Japanese camera manufacturers, which is different from the specifications of 120 and 135. Including APS cameras, APS films, post-printing of APS specifications (or compatibility), etc. , forming a complete photographic system.