The Sinar DB Set Sinaron W 4.5/75 lens is a large format lens in the standard DB auto aperture mount. It is used in different  Sinar cameras including the Sinar p1 8x10", Sinar x 4x5", Sinar f2 4x5", Sinar f2 5x7" Sinar f2 8x10", Sinar f1 4x5", and many more.

• The six element design of the 90mm focal length features a maximum aperture of f/6.8.
• The eight element design with the focal lengths of 65, 75, and 90mm come with a maximum aperture of f/4.5
• It comes with large image circles or angle of view of 102 degrees
• You can create bright and focused images with uniform illumination with the Sinar W 4.5/75 DB
• The Sinaron DB conversion Kit is used to fit these large format lenses to the auto aperture mount DB