Fujifilm Professional 4X Loupe back in the case of the

in the case of the shortest extension

The Rodenstock Rodagon 50mm f2

but it's a good performer

The Bronica GS-1 is a medium-format SLR that shoots 6x7cm images on 120 rollfilm

Fujifilm Professional 4X Loupe back in the case of theThis Fujifilm Professional 4x loupe is a well made device with a metal body and a clean glass optical system. The sliding skirt makes it suitable for both prints and transparencies, and the removable neckstrap keeps it convenient for desktop or mobile use. One note: the plastic diffuser skirt has internal flaws they look like little bubbles that affect its cosmetic appearance, but do not change its performance. Includes an eyepiece cap.