Yongnuo YN42.5mm F1.7M II 42mm
The 42.5mm focal length (85mm equivalent) and f/1.7 aperture deliver smooth bokeh and low-light capability in a tiny 146g body with STM autofocus. Its discreet, pocketable design integrates unobtrusively on small Micro Four Thirds bodies like the Panasonic G100 or Olympus E-M10 series. This lens is best for street photographers and budget-conscious portrait shooters who need a fast, lightweight prime for everyday candid work and environmental portraits.
Snapshot
Pros & Cons
Pros
- Strong build (90th percentile) 90th
- Strong af (87th percentile) 87th
Cons
- Below average user sentiment (4th percentile)
- Below average bokeh (15th percentile)
- Below average aperture (23rd percentile)
- Below average versatility (34th percentile)
What owners think
How owner sentiment changed over time
ExclusiveBased on when customers actually wrote their reviews - so you can see whether early praise held up.
Based on 9 dated customer reviews, grouped by calendar quarter. Period analysis is in English.
The proof
Performance
Specifications
Full Specifications
Optics
| Type | Prime |
| Focal Length Min | 42 |
| Focal Length Max | 42 |
| Elements | 9 |
| Groups | 8 |
| Coating | Multilayer Coating |
Aperture
| Max Aperture | f/22 |
| Min Aperture | f/1.7 |
| Constant | No |
| Diaphragm Blades | 7 |
Build
| Mount | Micro Four Thirds |
| Format | micro-four-thirds |
| Weight | 0.1 kg / 0.3 lbs |
| Filter Thread | 52 |
AF & Stabilization
| AF Type | STM stepper motor |
Focus
| Min Focus Distance | 300 |
| Max Magnification | 0.15x |
vs Competition
| Spec | Yongnuo YN42.5mm F1.7M II 42mm | Tamron Di III 28-75mm f/2.8 VXD G2 | Nikon NIKKOR Z DX 16-50mm f/3.5-6.3 VR | Panasonic LUMIX S S-R2060 | Sigma Art 28mm f/1.4 DG HSM Art | Fujifilm XF 18mm f/1.4 R LM WR |
|---|---|---|---|---|---|---|
| Focal Length | 42mm | 28-75mm | 16-50mm | 20-60mm | 28mm | 18mm |
| Max Aperture | f/22 | f/2.8 | f/3.5 | f/3.5 | f/1.4 | f/16 |
| Mount | Micro Four Thirds | Sony E | Nikon Z | L-Mount | Nikon F | Fujifilm X |
| Stabilization | false | false | true | false | false | false |
| Weather Sealed | false | true | false | true | true | true |
| Weight (g) | 150 | 540 | 135 | 350 | 865 | 370 |
| AF Type | STM stepper motor | VXD | Stepping Motor | stepping motor | HSM | Linear motor |
| Lens Type | prime | zoom | zoom | zoom | prime | prime |
| Compare | Compare | Compare | Compare | Compare |
| Product | AF | Bokeh | Build | Macro | Optical | Aperture | User Sentiment | Versatility | Social Proof | Stabilization |
|---|---|---|---|---|---|---|---|---|---|---|
| Yongnuo YN42.5mm F1.7M II 42mm | 87 | 14.5 | 89.6 | 34 | 47.4 | 22.6 | 3.6 | 33.6 | 50.6 | 38 |
| Tamron Di III 28-75mm f/2.8 VXD G2 Compare | 54.6 | 88.2 | 67.3 | 87.3 | 87.8 | 85.9 | 80.4 | 78.2 | 83 | 38 |
| Nikon NIKKOR Z DX 16-50mm f/3.5-6.3 VR Compare | 87 | 77.9 | 91.8 | 42.4 | 71.5 | 80 | 0 | 82.9 | 73.4 | 94.9 |
| Panasonic LUMIX S S-R2060 Compare | 87 | 86.3 | 80.6 | 66.2 | 76.4 | 80 | 0 | 81.5 | 64.6 | 38 |
| Sigma Art 28mm f/1.4 DG HSM Art Compare | 54.6 | 96.8 | 45.7 | 74.5 | 96.6 | 96.9 | 80.4 | 33.6 | 58.9 | 38 |
| Fujifilm XF 18mm f/1.4 R LM WR Compare | 98 | 41.3 | 79.4 | 84.1 | 83.4 | 45.9 | 90.8 | 33.6 | 87.8 | 38 |
Price
Value & Pricing
Amazon.ca 1 offer From CA$199
Price History
Usage Scores
A full written review is coming soon. The specs, scores, prices and charts above are always up to date.
