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
ADLinks to Amazon, MPB, Wex Photo Video, Park Cameras, eBay are affiliate links. We may earn a commission if you buy through them, at no extra cost to you.Links to London Camera Exchange are not affiliate links.Links marked “Search results” go to that retailer’s search page for this lens name.Check price and availability on the retailer’s own site.
AF 12mm F2
ADLinks to Amazon, MPB, Wex Photo Video, Park Cameras, eBay are affiliate links. We may earn a commission if you buy through them, at no extra cost to you.Links to London Camera Exchange are not affiliate links.Links marked “Search results” go to that retailer’s search page for this lens name.Check price and availability on the retailer’s own site.
RF10-20mm F4 L IS STM in detailAF 12mm F2 in detailAll RF mount lenses