Medium format: Quan Huafu: What does Aps format mean ... does it mean the size of the photo? Or perspective?

APS frame is a kind of frame called film used in "advanced photography system". The standard APS size is 24* 16 cm, which is equivalent to half of Quan Huafu. Nowadays, digital SLR has introduced this standard, and there are derivative frames such as APS-C and -H, and the size difference is not very big (APS-H is slightly larger).

Quan Huafu generally refers to 135 frame Quan Huafu in a small frame, which means complete coverage of 135 frame, and the screen size is 36*24.

Medium format generally refers to the specification part of 127 film and 120 film that is less than 6*9.

127 film specification has long been eliminated. Now there is a 6*6-frame 120 film standard, and the actual picture area is 57*57, so 6*6 frames can be called 120 Quan Huafu, but no one does. The specifications of 120 also have the economical usage of 6*4.5, and the specifications of 6*7 and 6*8 (commonly used in photo studios) and 6*9 are generally used as news machines. In fact, it is generally necessary to shoot a 6*9-frame 120 negative. The lens is actually a large-format lens with a very wide 6 12 on it.