Sigma 50mm F1.4 DG DN Art vs Voigtlander SEPTON 40mm f/2 Aspherical
The bottom line
These cover different focal lengths — the Sigma 50mm F1.4 DG DN Art is 50mm, the Voigtlander SEPTON 40mm f/2 Aspherical is 40mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 50mm F1.4 DG DN Art for short-telephoto / portrait, the Voigtlander SEPTON 40mm f/2 Aspherical for short-telephoto / portrait.
Choose the Sigma 50mm F1.4 DG DN Art if…
- ✓You want more light and background blur — f/1.4 is faster than f/2, better for low light and subject separation.
- ✓You work outdoors — it's weather-sealed against dust and moisture; the other isn't.
Choose the Voigtlander SEPTON 40mm f/2 Aspherical if…
- ✓You value portability — at 190g (6.7 oz) it's lighter than the 665g (1.47 lb) alternative for travel and all-day carry.
Where they differ
- ›Aperture: the Sigma 50mm F1.4 DG DN Art opens to f/1.4 vs the Voigtlander SEPTON 40mm f/2 Aspherical's f/2 — more light and shallower depth-of-field.
- ›Focal range: Sigma 50mm F1.4 DG DN Art is 50mm, Voigtlander SEPTON 40mm f/2 Aspherical is 40mm — different framing and reach.
- ›Weight: the Voigtlander SEPTON 40mm f/2 Aspherical is 190g (6.7 oz) vs 665g (1.47 lb) — you'll feel the difference handheld.
- ›Durability: the Sigma 50mm F1.4 DG DN Art is weather-sealed; the other isn't.
Frequently asked
Is the Sigma 50mm F1.4 DG DN Art or the Voigtlander SEPTON 40mm f/2 Aspherical better?
These cover different focal lengths — the Sigma 50mm F1.4 DG DN Art is 50mm, the Voigtlander SEPTON 40mm f/2 Aspherical is 40mm — so they're not really substitutes. Pick by the field of view you actually need: the Sigma 50mm F1.4 DG DN Art for short-telephoto / portrait, the Voigtlander SEPTON 40mm f/2 Aspherical for short-telephoto / portrait.
Who should choose the Sigma 50mm F1.4 DG DN Art?
Choose the Sigma 50mm F1.4 DG DN Art if you want more light and background blur — f/1.4 is faster than f/2, better for low light and subject separation. Choose it if you work outdoors — it's weather-sealed against dust and moisture; the other isn't.
Who should choose the Voigtlander SEPTON 40mm f/2 Aspherical?
Choose the Voigtlander SEPTON 40mm f/2 Aspherical if you value portability — at 190g (6.7 oz) it's lighter than the 665g (1.47 lb) alternative for travel and all-day carry.
What is the main difference between the Sigma 50mm F1.4 DG DN Art and the Voigtlander SEPTON 40mm f/2 Aspherical?
Aperture: the Sigma 50mm F1.4 DG DN Art opens to f/1.4 vs the Voigtlander SEPTON 40mm f/2 Aspherical's f/2 — more light and shallower depth-of-field.
| Product | ||
|---|---|---|
| Optical Design | ||
| Focal Length | 50mm | 40mm |
| Lens Type | Prime | Prime |
| Optical Elements | 17 | 9 |
| Optical Groups | 13 | 7 |
| Aperture & Iris | ||
| Maximum Aperture | f/1.4 | f/2 |
| Minimum Aperture | f/16 | f/16 |
| Aperture Blades | 11 | 10 |
| Rounded Aperture | Yes | Yes |
| Coverage & Angle | ||
| Format Coverage | Full-Frame | Full-Frame |
| Lens Mount | Sony E | Sony E |
| Angle of View | 47° | 57° |
| 35mm Equivalent | − | − |
| Focus | ||
| Autofocus | Yes | No |
| Focus Motor | HLA | − |
| Focus Limiter | No | No |
| AF/MF Switch | Yes | No |
| Min Focus Distance | 40 cm | 40 cm |
| Max Magnification | 0.15x | 0.15x |
| Stabilization & Video | ||
| Optical Stabilization | No | No |
| Aperture Ring | Yes | No |
| Declickable Aperture | Yes | No |
| Parfocal | No | No |
| Internal Zoom | No | No |
| General | ||
| Price (MSRP) | $999 | $999 |
| Filter Size | 72mm | 49mm |
| Diameter | 80.2mm | 61.5mm |
| Length | 111.3mm | 56.3mm |
| Weight | 665g (1.47 lb) | 190g (6.7 oz) |
| Weather Sealed | Yes | No |
| Tripod Collar | No | No |
