These are the best Sigma prime lenses when you want modern autofocus, consistent color, and sharp-but-pleasing rendering for everything from travel and street to portraits, products, and astro—across full-frame and APS-C—and here’s what to look for as you buy: match sensor coverage (DG/DG DN for full frame, DC DN for APS-C), decide your speed/size trade (f/1.2–f/1.4 for low light and separation vs compact f/2–f/2.8 I-Series for carry-everywhere), check autofocus motor and weather sealing (DG DN Art adds speed and gaskets; I-Series often has gasketed mounts), evaluate focus breathing if you shoot video, confirm front filter size for one CPL/VND, look at close-focus for detail cuts, and aim for a “house look” across your set (Art + I-Series color matches well). Full-frame wide/astro anchors: 14mm f/1.4 DG DN Art (Milky Way monster with disciplined corners), 20mm f/1.4 DG DN Art (balanced stars + subject), and 24mm f/1.4 DG DN Art (blue-hour city and environmental night); travel-friendly wides: 17mm f/4, 20mm f/2, and 24mm f/2 DG DN Contemporary (all-metal I-Series, threaded, close-focus for layered foregrounds). Everyday normals and documentary: 35mm f/1.4 DG DN Art (modern sharpness with controlled bokeh) or the tiny 35mm f/2 I-Series for pocket rigs; add 45mm f/2.8 DG DN Contemporary for featherweight walk-around rendering, and the 50mm f/1.4 DG DN Art as the low-light, eye-AF-friendly workhorse with fast drive, minimal breathing, and crisp micro-contrast. Portrait and stage heroes: 85mm f/1.4 DG DN Art (sharp, lighter than the DSLR version, lovely falloff), 135mm f/1.8 DG HSM/DG DN Art (razor detail and compression; DG DN where available for better handling), and the legendary 105mm f/1.4 DG HSM Art (“bokeh master”) when separation rules—mind the size but enjoy the look; for beauty/product detail, the 105mm f/2.8 DG DN Macro Art and 70mm f/2.8 DG Macro Art deliver 1:1 precision with clean CA control and smooth rings. APS-C prime set for travel/low light: 16mm f/1.4 DC DN (wide with great astro/street chops), 23mm f/1.4 DC DN (classic 35mm-eq. storyteller), 30mm f/1.4 DC DN (fast “normal” with creamy bokeh), and 56mm f/1.4 DC DN (portrait gem)—all compact, silent, and color-matched, perfect for hybrid work and gimbals. Characterful compact teles for full frame: 65mm f/2 and 90mm f/2 DG DN Contemporary bring metal builds, quick AF, and tasteful contrast in tiny packages that grade seamlessly with Art glass. Practical buyer tips: build around three primes you actually use (e.g., 24–50–85 for weddings/portraits, 20–35–105 Macro for landscape/product, 16–30–56 DC DN for APS-C travel), standardize filter sizes where possible, choose DG DN Art for the fastest AF and best breathing control if you film, add one macro to avoid faking detail shots, and balance speed vs weight—you’ll get more keepers from lenses you carry all day. Shooting tips: start one stop down from wide open for eyelash-sharp portraits while keeping bokeh, use close-focus on I-Series primes to build foreground layers, run eye-AF on fast Arts for moving subjects, keep a slim VND for video at 180° shutter, and for astro with the 14/1.4–24/1.4 set, focus via magnification on a bright star and test a 1/3–2/3-stop stop-down to tighten corners. Whether you’re crafting handheld street at dusk, building a portrait look with creamy roll-off, filming interviews with minimal breathing, or shooting 1:1 product stills, the best Sigma primes combine fast, coherent optics with compact, reliable mechanics—so your images and footage intercut cleanly from wide establishing shots to tight, cinematic reactions.