Sinaron DB Lenses Sinar Auto Aperture Mount DB are most convenient to operate. With its automatic aperture control they allow aperture settings of up to f/45 with the Sinar Auto Aperture Shutter. Auto Aperture Mount DB is the standard mount for all Sinaron large-format lenses. Application Sinaron large-format lenses in DB Auto Aperture Mount fit the following Sinar view cameras: Sinar p2 4x5", Sinar p2 5x7", Sinar p2 8x10", Sinar p1 4x5", Sinar p1 5x7", Sinar p1 8x10", Sinar x 4x5", Sinar f2 4x5", Sinar f2 5x7" Sinar f2 8x10", Sinar f1 4x5". To see if a specific lens covers the required image circle of a specific film format, please check the respective lens table. Existing large-format lenses can be fitted with Auto Aperture Mount DB by means of the appropriate conversion kit. The Sinar range of large-format DB lenses includes the following types of lenses: Sinaron-S Lenses Standard lenses featuring an enlarged image circle with an angle of view of 72°. Allows greater freedom for camera adjustments than conventional normal focal lengths that have an angle of view of only 53°. Available with focal lengths of 135, 150, 180, 240, 300 and 360mm Sinaron-SE Lenses This design represents state of the art technology with an angle of view of 75°. Significant improvements over earlier comparable lens types in terms of image quality, especially in the close-up range. Stray light within the lens amounts to less than one percent, producing better contrast in the images. Improved color correction by the use of ED glass type. Available with focal lengths of 135, 150, 180, 210, 240, 300 and 360mm Sinaron-W Lenses Professional lenses with an especially large image circle or angle of view of 102°. The six-element design with focal lengths of 90 has a maximum aperture of f/6.8. The eight-element designs with focal lengths of 65, 75 and 90 mm have a maximum aperture of f/4.5. Produce a very bright focusing image with uniform illumination all the way into the corners. Sinaron-WE Lenses These eight-element lenses with extremely short focal lengths have an angle of view of 110°. Apochromatic correction ensures the highest imaging quality across the entire image circle. Sinaron-WE lenses are available with focal lengths of 45 and 55 mm, with a maximum aperture of f/4.5. Macro-Sinaron Lens The primary concern in close-up photography is not the image circle or angle of view, but image quality. Macro-Sinaron lens feature optimum correction for reproduction ratios between 2:1 and 1:5. Available with focal length of 180 mm with a maximum aperture of f/5.6. Sinaron Digital Lenses Sinaron Digital Lenses with Auto Aperture Mounts were designed for use with digital single-chip CCD backs. Resolving power and selection of focal lengths are tailored specifically to the small size of the CCD array. Available with focal lengths of 28*, 35, 45, 55, 60, 80, 90, 100, 105, 120, 135, 150, 180, and 210 mm (* only with Sinar Auto Aperture Shutter). For more detailed information on Sinaron Digital Lenses please check with the section "Sinaron Digital DB".

Image: Heli Hinkel Sinar Lens Philosophy Sinaron Large Format Lenses - Table