These are the best Pentax lenses for bokeh when you want velvety background melt, gentle highlight roll-off, and color-rich files in compact, weather-ready K-mount kits for portraits, lifestyle, product, and night scenes. The modern full-frame flagships—HD PENTAX-D FA★ 85mm f/1.4 SDM AW and HD PENTAX-D FA★ 50mm f/1.4 SDM AW—deliver wide-open sharpness with smooth, cat’s-eye-controlled speculars, rounded diaphragms for creamy disks as you stop down, robust AW sealing for outdoor sessions, and decisive AF that flatters skin tones and keeps eyes tack-sharp. Classic Limited character brings dreamy separation in tiny metal barrels: the smc/HD PENTAX-FA 77mm f/1.8 Limited paints elegant falloff and micro-contrast “pop,” the FA 43mm f/1.9 Limited adds glossy transitions for environmental portraits and café scenes, and the FA 31mm f/1.8 Limited creates wide-normal glow with sunstars on tap when you close down—each with rendering that feels cinematic rather than clinical. On APS-C, the smc/HD PENTAX-DA★ 55mm f/1.4 SDM is the low-light portrait pick—creamy, skin-friendly bokeh with weather-resistant confidence—while the HD PENTAX-DA 70mm f/2.4 Limited is a featherweight tele-pancake that punches far above its size for head-and-shoulders looks and stage candids; budget shooters can grab the DA 50mm f/1.8 or DA 35mm f/2.4 for clean blur and quick focus in tiny, no-drama packages. For macro-grade background melt with crisp subject detail, the HD PENTAX-D FA 100mm f/2.8 Macro WR yields luxurious blur around jewelry, lashes, and textures, and doubles as a beautiful short-tele portrait lens; if you want more reach and painterly compression, the Samyang 135mm f/2 ED (K-mount) is a cult favorite—razor sharp wide open with buttery bokeh and a long, precise manual throw that makes focus pulls easy for video—while the smc/HD PENTAX-FA 50mm f/1.4 and FA 85mm f/1.4 (legacy) bring classic glow for vintage-style portraits. Wide-angle bokeh with modern polish arrives via the HD PENTAX-D FA 21mm f/2.4 Limited DC WR, whose close-focus intimacy and Limited rendering produce smooth, story-rich backgrounds in tight spaces, and creative curves with foreground-to-background transitions are possible with the HD PENTAX-DA 15mm f/4 Limited when you work close and let highlights bloom. Across the lineup, Pentax advantages help blur look its best: in-body Shake Reduction lets you shoot wide open at slower shutters for richer color and lower ISO, Pixel Shift delivers ultra-clean detail for skin and fabric without sharpening halos, Quick-Shift MF on many lenses invites micro-tuning after AF locks, and WR/AW seals keep sessions rolling in drizzle and sea spray. Practical picks: choose D FA★ 85/1.4 for flagship portrait cream and D FA★ 50/1.4 for luxe, do-everything shallow-DOF; run the FA 77/1.8 (with FA 43/1.9 or FA 31/1.8) when you want compact Limited character; mount DA★ 55/1.4 or DA 70/2.4 Limited on APS-C for flattering depth in pocketable builds; add D FA 100/2.8 Macro WR for beauty and product blur with clinical subject detail; and reach for Samyang 135/2 when long, painterly bokeh decides the shot. Shooting tips: focus a touch in front of the eye at very wide apertures to account for slight sway, keep subject-to-background distance generous for larger, smoother bokeh balls, avoid busy backdrops with high-contrast textures, and stop down 1/3–2/3 stop if you want cleaner edge shapes without losing the glow. Whether you’re crafting window-light headshots, moody lifestyle frames, or close-up product scenes with luxurious falloff, the best Pentax lenses for bokeh combine fast glass, refined diaphragms, and Pentax’s in-body tools—delivering subject-first images with backgrounds that melt away.