120 camera lens focal length
120 film also known as Brownie (Brownie) type film, or B2-8 type film. It uses a larger film area of 120 film, its width is about 6 cm, different types of 120 camera using the length of the film and there are differences, there are 4.5,6,7,9,12 or 17 cm, so 120 camera again There are 645,66,67,69,612,617 camera differences.
The camera uses a lens focal length that is different from that used by the 135 camera, with a 6 x 6 example: the standard mirror is 80mm, equal to 50mm for the 135 camera. And 6mm 6 with 50mm is equal to 135 camera 28mm, and 645 with 150mm is equal to 135 camera 90mm.
