The World's First Full Frame Fisheye with F1.4 BrightnessIntroducing a trailblazing prime lens from Sigma's acclaimed Art series - the 15mm F1.4 Dg Dn Diagonal Fisheye, engineered specifically for full frame mirrorless cameras. As the first fisheye lens of its kind with an extraordinarily bright F1.4 aperture, it empowers photographers to capture sweeping 180-degree perspectives in low light scenarios never before possible.Precision Aberration CorrectionSigma's renowned expertise in advanced optical engineering is on full display with this lens. The intricate arrangement of 21 elements in 15 groups, which incorporates exclusive low-dispersion and aspherical glass components, renders images sharp from edge-to-edge even when shooting wide open.Specialized Astrophotography FeaturesGoing beyond its game-changing F1.4 aperture capabilities, Sigma designed the 15mm prime with astrophotographers specifically in mind.