Canon RF10-20mm F4 L IS STMvsSamyang AF 12mm F2
RF10-20mm F4 L IS STM
10-20mm / F4
—
AF 12mm F2
12mm / F2
18mm equiv.
—
Which to choose
When the RF10-20mm F4 L IS STM suits you better
- Zoom rangeCovers 10-20mm in a single lens
- StabilizationHas stabilization
- Weather sealingHas weather sealing
When the AF 12mm F2 suits you better
- Brightness2.0 stops brighter — better in low light and blurs the background more
- Weight357g lighter, so easier to carry
- Close focusFocuses as close as 20cm
These points are derived mechanically from the numbers. How a lens actually renders does not show up in specifications, so look at samples before deciding.
Size compared
- RF10-20mm F4 L IS STM112mm long × 83.7mm diameter
- AF 12mm F257.2mm long × 70mm diameter
Specifications compared
| Specification | Canon RF10-20mm F4 L IS STM | Samyang AF 12mm F2 | Difference |
|---|---|---|---|
| Focal length (wide) | 10mm | 12mm | −2mm |
| Focal length (tele) | 20mm | 12mm | +8mm |
| Max aperture (wide) | F4 | F2 | 2.0 stops darker |
| Max aperture (tele) | F4 | F2 | 2.0 stops darker |
| Min aperture | F22 | — | No data |
| Min focus distance | 25cm | 20cm | +0.05m |
| Max magnification | 0.12× | 0.09× | +0.03x |
| Aperture blades | 9blades | — | No data |
| Weight | 570g | 213g | +357g |
| Length | 112mm | 57.2mm | +54.8mm |
| Diameter | 83.7mm | 70mm | +13.7mm |
| Filter size | — | 62mm | No data |
| Released | 2023 | 2025 | −2year |
| Stabilization | Yes | No | Yes |
| Weather sealing | Yes | No | Yes |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as RF10-20mm F4 L IS STM relative to AF 12mm F2.The highlighted cell is the better side for that specification.
Check prices
RF10-20mm F4 L IS STM
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AF 12mm F2
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RF10-20mm F4 L IS STM in detailAF 12mm F2 in detailAll RF mount lenses