What is the visual field rate of Pentax 645D?

The field of view rate refers to the viewing range, which refers to the ratio of the scene range seen through the viewfinder to the scene range of the negative film, expressed as a percentage. Generally, the picture seen from the viewfinder is not completely the shot picture, but always smaller than the shot picture, generally 90 ~ 100%. Only when the framing range reaches 100% can it be called accurate framing. At present, most professional SLR cameras can reach the framing range of 100%.

The visual field rate of Pentax 645D is only 98%.