1. Samsung NX 20mm F2.8 i-Function Review The NX 20mm i-Fn is a Samsung NX mount lens and has 20mm focal length (equivalent to 30.8mm in 35mm format), so it’s good for landscape, snap, and self shots. It has F2.8 in maximum opening and 7 blades. The lens consists of 6 elements in 4 groups (included 1 aspheric lens) and 0.17m of available shooting range. Pouch and lens stand are included in the package. The filter diameter is 43mm and has 62.2x24.5mm of size and 89g of weight. 14 sunstars When taking a night shot, if you want to make sunstar effects, let’s use the aperture. The NX 20mm i-Fn has 7 blades, so tightening up the aperture, it makes 14 sunstars. However, they were not that clear or long. http://www.segadget.com/entry/630