Compare Samyang 20mm F1.8 ED AS UMC vs Pentax HD Pentax DA 15mm F4 ED AL Limited vs Pentax HD Pentax-D FA 21mm F2.4ED Limited DC WR

[[{"Ft":"Construction","Fn":"Aperture Blades","Fv":"7 blades"},{"Ft":"Construction","Fn":"Form Factor","Fv":"Ultra Wide-Angle Prime Lens"},{"Ft":"Construction","Fn":"Image Size","Fv":"Full-Frame"},{"Ft":"Construction","Fn":"Lens Barrel","Fv":"Physical aperture ring, Distance scale"},{"Ft":"Construction","Fn":"Lens Mount","Fv":"Canon EF-mount, Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, Sony E-mount"},{"Ft":"Construction","Fn":"Optical Formula | Elements","Fv":"13 elements"},{"Ft":"Construction","Fn":"Optical Formula | Groups","Fv":"12 groups"},{"Ft":"Construction","Fn":"Optical Formula | Special Glass","Fv":"Two aspherical + 3 ED elements, Ultra Multi Coating groups"},{"Ft":"Dimensions","Fn":"Filter Diameter","Fv":"77 mm / 3.03 in"},{"Ft":"Dimensions","Fn":"Size | Diameter","Fv":"83 mm / 3.27 in"},{"Ft":"Dimensions","Fn":"Size | Length","Fv":"88 mm / 3.46 in"},{"Ft":"Dimensions","Fn":"Weight","Fv":"497 g / 17.56 oz"},{"Ft":"Function","Fn":"Angle Of View","Fv":"94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical"},{"Ft":"Function","Fn":"Aperture","Fv":"f/1.8 ~ f/22"},{"Ft":"Function","Fn":"Autofocus","Fv":"No"},{"Ft":"Function","Fn":"Focal Length","Fv":"20 mm"},{"Ft":"Function","Fn":"Focus Type","Fv":"Internal"},{"Ft":"Function","Fn":"Image Stabilization","Fv":"No"},{"Ft":"Function","Fn":"Weather Resistance","Fv":"No"},{"Ft":"Performance","Fn":"Min Focus Distance","Fv":"200 mm / 7.87 in"},{"Ft":"Production","Fn":"Accessory","Fv":"Lens hood included"},{"Ft":"Production","Fn":"Debut","Fv":"2016-08-08"}],[{"Ft":"Construction","Fn":"Aperture Blades","Fv":"9 blades, Rounded aperture diaphragm"},{"Ft":"Construction","Fn":"Colors","Fv":"Black, Silver"},{"Ft":"Construction","Fn":"Form Factor","Fv":"Ultra Wide-Angle Prime Lens"},{"Ft":"Construction","Fn":"Image Size","Fv":"APS-C"},{"Ft":"Construction","Fn":"Lens Barrel","Fv":"Distance scale, DoF scale"},{"Ft":"Construction","Fn":"Lens Mount","Fv":"Pentax K-mount"},{"Ft":"Construction","Fn":"Motor","Fv":"Screw drive from camera"},{"Ft":"Construction","Fn":"Optical Formula | Elements","Fv":"8 elements"},{"Ft":"Construction","Fn":"Optical Formula | Groups","Fv":"6 groups"},{"Ft":"Construction","Fn":"Optical Formula | Special Glass","Fv":"1 Hybrid aspherical element, 1 ED glass element, High-grade multi-layer HD (High Definition) Coating groups"},{"Ft":"Dimensions","Fn":"Filter Diameter","Fv":"49 mm / 1.93 in"},{"Ft":"Dimensions","Fn":"Size | Diameter","Fv":"63 mm / 2.48 in"},{"Ft":"Dimensions","Fn":"Size | Length","Fv":"40 mm / 1.57 in"},{"Ft":"Dimensions","Fn":"Weight","Fv":"189 g / 6.68 oz"},{"Ft":"Function","Fn":"Angle Of View","Fv":"87.8° Diagonal | 77.3° Horizontal | 56.1° Vertical"},{"Ft":"Function","Fn":"Aperture","Fv":"f/4 ~ f/22"},{"Ft":"Function","Fn":"Autofocus","Fv":"Yes"},{"Ft":"Function","Fn":"Crop Factor","Fv":"1.5"},{"Ft":"Function","Fn":"Focal Length","Fv":"15 mm"},{"Ft":"Function","Fn":"Focal Length (35mm Equivalent)","Fv":"22.5 mm"},{"Ft":"Function","Fn":"Focus Type","Fv":"Unit"},{"Ft":"Function","Fn":"Image Stabilization","Fv":"No"},{"Ft":"Performance","Fn":"Max Magnification","Fv":"0.15x"},{"Ft":"Performance","Fn":"Min Focus Distance","Fv":"180 mm / 7.09 in"},{"Ft":"Production","Fn":"Accessory","Fv":"Lens Hood: built-in hood (supplied)"},{"Ft":"Production","Fn":"Debut","Fv":"2013-08-27"}],[{"Ft":"Construction","Fn":"Aperture Blades","Fv":"8 blades, Rounded diaphragm"},{"Ft":"Construction","Fn":"Colors","Fv":"Black, Silver"},{"Ft":"Construction","Fn":"Form Factor","Fv":"Ultra Wide-Angle Prime Lens"},{"Ft":"Construction","Fn":"Image Size","Fv":"Full-Frame"},{"Ft":"Construction","Fn":"Lens Barrel","Fv":"Distance scale, DoF scale"},{"Ft":"Construction","Fn":"Lens Mount","Fv":"Pentax K-mount"},{"Ft":"Construction","Fn":"Material","Fv":"Aluminum"},{"Ft":"Construction","Fn":"Optical Formula | Elements","Fv":"11 elements"},{"Ft":"Construction","Fn":"Optical Formula | Groups","Fv":"8 groups"},{"Ft":"Construction","Fn":"Optical Formula | Special Glass","Fv":"4 ED elements, 1 Super ED element groups"},{"Ft":"Dimensions","Fn":"Filter Diameter","Fv":"67 mm / 2.64 in"},{"Ft":"Dimensions","Fn":"Size | Diameter","Fv":"74 mm / 2.91 in"},{"Ft":"Dimensions","Fn":"Size | Length","Fv":"89 mm / 3.50 in"},{"Ft":"Dimensions","Fn":"Weight","Fv":"416 g / 14.70 oz"},{"Ft":"Function","Fn":"Angle Of View","Fv":"91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical"},{"Ft":"Function","Fn":"Aperture","Fv":"f/2.4–22 ~ f/2.4–22"},{"Ft":"Function","Fn":"Autofocus","Fv":"Yes"},{"Ft":"Function","Fn":"Focal Length","Fv":"21 mm"},{"Ft":"Function","Fn":"Focus Type","Fv":"Internal"},{"Ft":"Function","Fn":"Image Stabilization","Fv":"No"},{"Ft":"Function","Fn":"Weather Resistance","Fv":"Yes"},{"Ft":"Performance","Fn":"Max Magnification","Fv":"0.26x"},{"Ft":"Performance","Fn":"Min Focus Distance","Fv":"180 mm / 7.09 in"},{"Ft":"Production","Fn":"Accessory","Fv":"Lens hood included"},{"Ft":"Production","Fn":"Debut","Fv":"2021-10-21"}]]