Comparison of Canon EF 40mm ƒ/2.8 STM and Pentax 40mm f/2.8 Limited HD DA [S]ave
| Attribute |  Canon EF 40mm ƒ/2.8 STM × |  Pentax 40mm f/2.8 Limited HD DA × |
|---|---|---|
| Filter Size (mm) | 52 | 49 |
| Notes | Optional lens hood: ES-52 | Available in black or silver; High-grade multi-layer HD (High Definition) coating; Rounder aperture blades should yield more pleasing bokeh. |
| Closest Focus (m) | 0.3 | 0.4 |
| Magnification Ratio (x) | 0.18 | 0.13 |
| Type | Wide Prime ("Pancake") | Standard Prime |
| Length (mm) | 22.8 | 15 |
| APS Equivalent | 64mm | 61mm |
| Diagonal Angle of View (degree) | 57.00 | 39.00 |
| Image Circle | 35mm | APS-C |
| Focal Length (mm) | 40.00 | 40.00 |
| Brand | Canon | Pentax |
| Name | Canon EF 40mm ƒ/2.8 STM | Pentax 40mm f/2.8 Limited HD DA |
| Weight (g) | 130 | 89 |
| Aperture (f) | 2.80 - 22.00 | 2.80 - 22.00 |
| Diaphragm Blades | 7 | 9 |
| Diaphragm Blades Type | circular | rounded |
| Lens Construction | 6 elements in 4 groups, including 1 aspherical element | 5 elements in 4 groups |
| Diameter (mm) | 68.2 | 63 |
| Focus Details | AF/MF with STM (Stepping Motor Technology) | "Quick Shift" AF/MF mechanism |
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