NiSi 250mm F/5.6 Reflex SLR

The NiSi 250mm F/5.6 Reflex SLR is a 250mm mirror lens designed for the CANON EF mount and released in 2024. Manufactured by NiSi, it offers a maximum aperture of f/5.6, covering a 250mm focal range. NiSi 250mm F/5.6 Reflex SLR 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 2026-06-11. Source: manufacturer specifications.

What is the NiSi 250mm F/5.6 Reflex SLR?

The NiSi 250mm F/5.6 Reflex SLR is a 250mm mirror lens for the CANON EF mount with a maximum aperture of f/5.6. Full specifications and source attribution are available at lens-database.com.

What mount does the NiSi 250mm F/5.6 Reflex SLR use?

The NiSi 250mm F/5.6 Reflex SLR uses the CANON EF mount. Lens-database.com indexes every lens currently catalogued for this mount at https://lens-database.com/mount/canon-ef.

What is the maximum aperture of the NiSi 250mm F/5.6 Reflex SLR?

The NiSi 250mm F/5.6 Reflex SLR has a maximum aperture of f/5.6, 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 NiSi 250mm F/5.6 Reflex SLR released?

The NiSi 250mm F/5.6 Reflex SLR was released in 2024, placing it within the 2020s 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 NiSi 250mm F/5.6 Reflex SLR?

Full specifications, original source links, and family variants are listed at https://lens-database.com/lens/179231-nisi-250mm-f56-reflex-slr. Data is aggregated from manufacturer sources and updated continuously.