NiSi 250mm F/5.6 Reflex
Medium telephoto prime lens • Digital era
- Announced:
- · July 2024
- Production status:
- ● In production
- Country of design:
- · PRC (People's Republic of China)
- Original name:
- · NiSi 250mm F5.6 Reflex MF
- Class:
- · Slow full-frame medium telephoto prime lens
- · Mirror/Reflex lens
Specification
| Optical design: | |
| 35mm full frame | |
| 250mm | |
| F/5.6 | |
| 6 elements in 3 groups | |
| Canon RF | |
| Fujifilm X | |
| Nikon Z | |
| Sony E | |
| 9.9° (35mm full frame) | |
| 6.5° (Fujifilm X APS-C) | |
| On Canon EOS R APS-C [1.61x] cameras: | |
35mm equivalent focal length: | 402.5mm (in terms of field of view) |
35mm equivalent speed: | F/9 (in terms of depth of field) |
Diagonal angle of view: | 6.2° |
| On Fujifilm X APS-C [1.52x] cameras: | |
35mm equivalent focal length: | 380mm (in terms of field of view) |
35mm equivalent speed: | F/8.5 (in terms of depth of field) |
Diagonal angle of view: | 6.5° |
| On Nikon Z APS-C [1.53x] cameras: | |
35mm equivalent focal length: | 382.5mm (in terms of field of view) |
35mm equivalent speed: | F/8.6 (in terms of depth of field) |
Diagonal angle of view: | 6.5° |
| On Sony NEX/a/ZV APS-C [1.53x] cameras: | |
35mm equivalent focal length: | 382.5mm (in terms of field of view) |
35mm equivalent speed: | F/8.6 (in terms of depth of field) |
Diagonal angle of view: | 6.5° |
| Diaphragm mechanism: | |
Diaphragm type: | Fixed |
Aperture control: | None |
| Focusing: | |
| 2m | |
| 1:7.14 | |
Focusing modes: | Manual focus only |
Manual focus control: | Focusing ring |
| Physical characteristics: | |
| <No data> | |
| <No data> | |
| - | |
| - | |
| Accessories: | |
| Screw-type 62mm | |
| Built-in telescopic round | |
| <No data> |
Source of data
- Manufacturer's technical data.
Typical characteristics of mirror (reflex) lenses
- Catadioptric system consisting of curved mirrors and optical glass;
- Much shorter, lighter and less expensive designs than conventional super telephoto lenses;
- Outstanding correction of chromatic aberrations;
- Since the aperture is fixed, neutral density filters are used to obtain a smaller aperture;
- Doughnut-shaped out-of-focus highlights.
From the editor
Although this lens is available with mirrorless camera mounts, optically it is based on a formula calculated for SLR cameras. We decided to record this lens separately in our database, however, for the manufacturer description, please refer to the page dedicated to the optically identical SLR version.