Creating the Image in the Viewfinder
The medium format image is only as good as the view through the finder. The type of finder and your method of viewing, framing, and focusing are important elements for creating the image.
On most nonreflex cameras—the rangefinder, press, and special wide angle types—the finder is a permanent part of the camera body, and you have no choice of viewing from different angles. This is not necessarily a disadvantage. These finders are usually well designed and serve their purpose for composing the image. A split image rangefinder may be part of the finder so it can also be used for focusing.
These optical finders have their own advantage. The image appears as bright as you see the ...