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- The slimmest EF lens with merely 22.8mm thickness and weights only 130g to give superb mobility
- Newly developed 6 elements in 4 groups optical lens construction
- 1 high-precision Glass-Molded (GMo) Aspherical lens element to achieve high image quality from the image center to periphery
- Quiet and smooth continuous AF is supported in movie shooting and Live View shooting*1 by a thorough optimization of the continuous AF mechanism with the adoption of newly developed Stepping Motor (STM)
- 7-blade circular aperture for beautiful bokeh
- New micro-stepping drive is used in the aperture control for quieter drive during movie shooting
- 0.30m minimum focusing distance with 0.18x maximum magnification
- Lens placement and coatings are optimized for digital cameras to ensure excellent color balance and minimize ghosting and flare
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- Canon EF 40mm f2.8 STM
- Front Cap & Rear Cap
- Manual
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| Focal Length |
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40mm |
| Angle of View |
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57°30’ |
| Lens Construction |
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6 elements in 4 groups |
| Aperture range |
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f/2.8-f/22 |
| Built-in Image Stabilizer |
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N/A |
| Closest Focusing Distance |
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0.3 m |
| Maximum Magnification |
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0.18x |
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Special Lens Elements
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1 Aspherical lens element |
| No. of Diaphragm Blades |
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7 (circular aperture) |
| AF Actuator |
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Stepping Motor (STM) |
| Focus Mode |
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AF / MF |
| Filter Diameter (mm) |
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52mm |
| Weight |
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130 g |
| Dimension |
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22.8 x 68.2mm |
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