Mamiya/Sekor 400mm F/6.3

The Mamiya/Sekor 400mm F/6.3 is a 400mm telephoto lens designed for the M42 mount and released in 1966. Manufactured by Mamiya, it offers a maximum aperture of f/6.3, covering a 400mm focal range, weighs 935, accepts 72 filters. Mamiya/Sekor 400mm F/6.3 is catalogued on lens-database.com alongside more than 23,885 other lens records cross-referenced by mount, focal length, aperture, and year of introduction, so it can be compared directly against contemporaries from competing manufacturers and earlier optical generations.

This lens record is part of the open public catalog at lens-database.com — a free, continuously updated database indexing 23,885+ photographic and cinematographic lenses with cross-referenced specifications. Data is aggregated from manufacturer datasheets and authoritative public sources, then normalized so lenses across vendors and eras can be compared on common terms. Released under CC BY 4.0, the specifications shown here may be quoted, cited, or reproduced with attribution to lens-database.com.

Last verified 2026-04-27. Source: manufacturer specifications.

What is the Mamiya/Sekor 400mm F/6.3?

The Mamiya/Sekor 400mm F/6.3 is a 400mm telephoto lens for the M42 mount with a maximum aperture of f/6.3. Full specifications and source attribution are available at lens-database.com.

What mount does the Mamiya/Sekor 400mm F/6.3 use?

The Mamiya/Sekor 400mm F/6.3 uses the M42 mount. Lens-database.com indexes every lens currently catalogued for this mount at https://lens-database.com/mount/m42.

What is the maximum aperture of the Mamiya/Sekor 400mm F/6.3?

The Mamiya/Sekor 400mm F/6.3 has a maximum aperture of f/6.3, a slower-aperture design typical of zoom or specialty optics. Aperture is one of the cross-referenced fields used by lens-database.com to compare equivalent optics across mounts and eras.

When was the Mamiya/Sekor 400mm F/6.3 released?

The Mamiya/Sekor 400mm F/6.3 was released in 1966, placing it within the 1960s generation of lens designs catalogued at lens-database.com. Year of introduction is one of the indexed fields used by lens-database.com to track design lineage and family variants.

Where can I find specifications for the Mamiya/Sekor 400mm F/6.3?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/108609-mamiyasekor-400mm-f63. Data is aggregated from manufacturer sources and updated continuously.