Specifications#
- Brand
- Samyang
- Model
- AF 45mm f/1.8
- Lens type
- Standard prime
- Focal length
- 45 mm
- Maximum aperture
- f/1.8
- Image circle
- Full frame (36×24 mm)
- Mount(s)
- Sony E-mount
- 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 45 mm | Equiv. aperture (DoF) |
|---|---|---|
| Full frame | 45 mm · 51° | f/1.8 |
| APS-C | 68 mm · 35° | f/2.7 |
| APS-C (Canon) | 72 mm · 33° | f/2.9 |
| Micro Four Thirds | 90 mm · 27° | f/3.6 |
Depth of field & background blur#
Computed on its native Full frame format (CoC 30 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. Full table: 50 mm f/1.8 on full frame.
| Focal | Aperture | at 1 m | at 2 m | at 5 m | at 10 m | Hyperfocal | Blur @2 m |
|---|---|---|---|---|---|---|---|
| 45 mm | f/1.8 | 5.1 cm | 20.9 cm | 1.34 m | 5.71 m | 37.5 m | 1.6% |
| 45 mm | f/4 | 11.4 cm | 47.0 cm | 3.21 m | 18.1 m | 16.9 m | 0.7% |
| 45 mm | f/8 | 22.9 cm | 97.9 cm | 8.96 m | ∞ | 8.48 m | 0.4% |
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 45 mm | NPF at 45 mm, f/1.8 |
|---|---|---|---|
| Full frame | 1/50 s | 11 s | 5 s |
| APS-C | 1/60 s | 7 s | 4 s |
| APS-C (Canon) | 1/80 s | 7 s | 4 s |
| Micro Four Thirds | 1/100 s | 6 s | 4 s |
Compatible cameras#
Bodies in our database with a native Sony E-mount mount.
- Sony α7R VI 2026
- Sony α7 V 2025
- Sony ZV-E10 II 2024
- Sony α1 II 2024
- Sony α9 III 2024
- Sony α6700 2023
- Sony ZV-E1 2023
- Sony α7C II 2023
- Sony α7CR 2023
- Sony α7R V 2022
- Sony FX30 2022
- Sony FX3 2021
- Sony ZV-E10 2021
- Sony α1 2021
- Sony α7 IV 2021
- Sony α7S III 2020
- Sony FX6 2020
- Sony α7R IV 2019
- Sony α6400 2019
- Sony α6600 2019
- Sony α6100 2019
- Sony α7 III 2018
- Sony α6300 2016
- Sony α6500 2016
- Sony α7R II 2015
- Sony α7S II 2015
- Sony α5000 2014
- Sony α5100 2014
- Sony α6000 2014
- Sony NEX-3N 2013
- Sony NEX-5T 2013
- Sony α3000 2013
- Sony α7 2013
- Sony NEX-F3 2012
- Sony NEX-7 2011
- Sony NEX-C3 2011
- Sony Alpha NEX-5N 2011
- Sony NEX-5 2010
- Sony Alpha NEX-3 2010
- Sony α7R III
Adapt it to other systems#
Similar lenses#
- Sigma 45mm F2.8 DG DN | Contemporary 019 f/2.8
- Sony FE 50mm f/1.2 GM f/1.2
- Pentax SMC Takumar 50mm f/1.4 f/1.4
- Samyang 50mm f/1.4 AS UMC f/1.4
- Sony FE 50mm f/1.4 GM f/1.4
- Sony FE 50mm f/1.8 f/1.8
- Sony FE 50mm f/2.5 G f/2.5
- Viltrox AF 50mm f/1.8 Z f/1.8
- Voigtländer APO-Lanthar 50mm F2 Aspherical f/2
- Zeiss Loxia 50mm f/2 Planar T* f/2
- Zeiss Planar 50mm f/1.7 AEJ f/1.7
- Sigma 40mm F1.4 DG HSM | Art f/1.4
Frequently asked questions#
Is the Samyang AF 45mm f/1.8 full frame?
Yes — it covers the full 36 × 24 mm frame.
What is the Samyang AF 45mm f/1.8 equivalent to on APS-C?
On a 1.5× APS-C body it frames like 68 mm, and like 72 mm on Canon APS-C.
What is the Samyang AF 45mm f/1.8 good for?
As a standard prime it suits street, documentary, everyday and low-light shooting.
Sources & licences#
- Lensfun lens database — CC BY-SA 3.0
Last updated October 03, 2026 · How we calculate · Sources