Sigma 17-40mm F1.8 DC ArtvsVoigtländer NOKTON 40mm F1.2 Aspherical E-mount
17-40mm F1.8 DC Art
17-40mm / F1.8
26-60mm equiv.
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NOKTON 40mm F1.2 Aspherical E-mount
40mm / F1.2
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Which to choose
When the 17-40mm F1.8 DC Art suits you better
- Close focusFocuses as close as 28cm
- Zoom rangeCovers 17-40mm in a single lens
- Weather sealingHas weather sealing
When the NOKTON 40mm F1.2 Aspherical E-mount suits you better
- Brightness1.2 stops brighter — better in low light and blurs the background more
- Weight105g lighter, so easier to carry
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
- 17-40mm F1.8 DC Art117mm long × 72.9mm diameter
- NOKTON 40mm F1.2 Aspherical E-mount59.3mm long × 69.6mm diameter
Specifications compared
| Specification | Sigma 17-40mm F1.8 DC Art | Voigtländer NOKTON 40mm F1.2 Aspherical E-mount | Difference |
|---|---|---|---|
| Focal length (wide) | 17mm | 40mm | −23mm |
| Focal length (tele) | 40mm | 40mm | — |
| Max aperture (wide) | F1.8 | F1.2 | 1.2 stops darker |
| Max aperture (tele) | F1.8 | F1.2 | 1.2 stops darker |
| Min aperture | F16 | F22 | −6.0 |
| Min focus distance | 28cm | 35cm | −0.07m |
| Max magnification | 0.19× | 0.16× | +0.03x |
| Aperture blades | 11blades | 10blades | +1blades |
| Weight | 525g | 420g | +105g |
| Length | 117mm | 59.3mm | +57.7mm |
| Diameter | 72.9mm | 69.6mm | +3.3mm |
| Filter size | 67mm | 58mm | +9mm |
| Released | 2025 | 2017 | +8year |
| Stabilization | No | No | — |
| Weather sealing | Yes | No | Yes |
| Macro | No | No | — |
| Autofocus | Yes | No | Yes |
The difference column reads as 17-40mm F1.8 DC Art relative to NOKTON 40mm F1.2 Aspherical E-mount.The highlighted cell is the better side for that specification.
Check prices
17-40mm F1.8 DC Art
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NOKTON 40mm F1.2 Aspherical E-mount
ADLinks to Amazon, B&H Photo, Adorama, KEH Camera, MPB, eBay are affiliate links. We may earn a commission if you buy through them, at no extra cost to you.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.
17-40mm F1.8 DC Art in detailNOKTON 40mm F1.2 Aspherical E-mount in detailAll E-mount lenses