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SKH 71–4B1 is a Beseler-branded head for use in photographic enlargers. It is designed for use with the Beseler 45MX, 45MXC, 45VL, and 45MXL enlargers, as well as the Omega D2 and D5 enlargers. It supports 35mm, 2¼” x 3¼”, 3¼” x 4¼”, 4” x 5”, 5”x 7”, and 8” x 10” negatives and prints. It has an unobstructed adjustable condenser design, symmetrically arranged diffusion and condenser systems, cone type lantern-shaped lenses, a depth of field scale, and a bearing-mounted focus handle.