• Aperture ring click switch
• Focus mode switch
• AFL button (customisable on some models)
• Petal-type hood (fixed)
• MFL (Manual Focus Lock) switch
• Rear filter holder
• Specially designed front cap (filter slots, lock mechanism)
• Dust and splash resistant structure
• Water & oil repellent coating (Front element)

With its advanced optical design that includes 1 SLD, FLD and 4 aspherical elements, the lens has been designed with astrophotography in mind. With particular emphasis on optical quality at infinity focus, the lens has very well-controlled optical aberrations and sagittal coma flare, which ensures that bright points of light remain pin-sharp and round at all apertures and across the entire frame.

The lens uses in-camera optical aberration control profiles to help correct for any distortion or vignetting, whereas optical issues that are more difficult to improve digitally, such as corner softness and chromatic aberration, are eliminated by the lens’ sophisticated optical design. Using optical aberration control selectively in this way helps to keep the size and weight of the lens down.

The 14mm F1.4 DG DN | Art has a professional feature-set that makes it easier for photographers and film-makers to achieve the best possible results. Built in to the barrel is an aperture ring, which can be set to auto for aperture control on the camera. With a very precise action, the ring can also be de-clicked if preferred or locked in place so that it’s not accidentally knocked. At the front of the barrel is a Lens Heater Retainer, which was a feature introduced on the SIGMA 20mm F1.4 DG DN | Art. This helps hold a heat strip in place, which are often used by astrophotographers when shooting in cold conditions to prevent condensation build-up on the front element. The lens features a rear filter holder that allows sheet-type filters to be attached. Soft type filters are preferred by astrophotographers as they make stars appear softer, larger and brighter. Other types sheet-type filter can also be used.