Specifications#
- Brand
- Samyang
- Model
- 800mm f/8 Mirror DX
- Lens type
- Super-telephoto prime
- Focal length
- 800 mm
- Maximum aperture
- f/8
- Image circle
- APS-C (23.5×15.6 mm)
- Mount(s)
- T-mount (T2)
- Projection
- Rectilinear
- Lensfun correction profile
- Yes — distortion/vignetting/TCA
Equivalent focal length on different cameras#
Field of view and depth-of-field equivalence when this lens is used on bodies with different sensor sizes (natively or via an adapter).
| Camera format | At 800 mm | Equiv. aperture (DoF) |
|---|---|---|
| APS-C | 1200 mm · 2° | f/12.0 |
| APS-C (Canon) | 1280 mm · 2° | f/12.8 |
| Micro Four Thirds | 1600 mm · 2° | f/16.0 |
Depth of field & background blur#
Computed on its native APS-C format (CoC 20 µm). “Blur @2 m” is the size of an out-of-focus point at infinity, as a percentage of frame width, with the subject at 2 m — a simple bokeh index.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 800 mm | f/8 | — | 0.1 cm | 1.0 cm | 4.5 cm | 4.1 km | 283.7% |
Handheld & night-sky limits#
NPF assumes typical 20–24 MP sensors (≈6 µm pixels on full frame, ≈3.9 µm on APS-C, ≈3.3 µm on Micro Four Thirds).
| Body | Min. handheld shutter (longest focal) | 500 rule at 800 mm | NPF at 800 mm, f/8 |
|---|---|---|---|
| APS-C | 1/1250 s | 0 s | 0 s |
| APS-C (Canon) | 1/1250 s | 0 s | 0 s |
| Micro Four Thirds | 1/1600 s | 0 s | 0 s |
Adapt it to other systems#
Similar lenses#
Frequently asked questions#
Is the Samyang 800mm f/8 Mirror DX full frame?
No — it is designed for APS-C sensors. On a full-frame body it vignettes or triggers crop mode.
What is the Samyang 800mm f/8 Mirror DX equivalent to on APS-C?
Its focal length is already the real value for APS-C: 800 mm frames like 1227 mm on full frame.
What is the Samyang 800mm f/8 Mirror DX good for?
As a super-telephoto prime it suits birds, wildlife and field sports from a distance.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources