The number of full-frame prime lenses covering a 20mm focal length with a fast maximum aperture of f/1.4 are few and far between. Though it’ll be most popular with people who specialise in astrophotography, its stunning optical performance can be applied to landscapes, interiors and architecture. It’s a large and heavy lens that features a focus distance window and bulbous front element. A permanently fixed petal-shape hood protects the latter. It returns its best results across the frame at f/4 and is just as sharp in the centre at f/1.4 as it is at f/8. It’s an exceptional prime for shooting in low-light conditions. The only downside is that it’s not weather sealed.
The Sigma 28mm F1.4 DG HSM I Art wide-angle lens stands out due to its thoroughly corrected magnification, chromatic aberration and sagittal coma flare, as well as its completely minimised distortion thanks to its optical design.
This lens from Sigma is a first-class example that can be used for a wide variety of genres and its stunning optical quality won’t leave those who shoot weddings, portraits or documentary images disappointed. It’s incredibly sharp in the centre between f/2 and f/11. Full-time manual focus override is great to have for fine-tuning focus and is aided by a delightfully smooth manual focus ring. Regrettably it’s not weather sealed, but this is a minor criticism on what is otherwise a sublime prime that produces striking results.
Sigma’s award-winning 50mm F1.4 DG HSM Art lens isn’t small or light, yet it excels in terms of its optical performance and features a specially developed algorithm that ensures accurate, quiet and smooth focusing. The quality of out-of-focus areas at wide apertures is exquisite. It’s a lens that lends itself to isolating subjects and emphasizing them in the frame, with quite astonishing sharpness from corner to corner between f/2.8 and f/11. It lacks weather sealing and optical image stabilisation, but these are omissions you’ll be prepared to live without for the outstanding results it produces.