Unknown. Help us by suggesting a value. (Leica Summicron-TL 23mm f/2 ASPH)
Unknown. Help us by suggesting a value. (Zeiss Batis 18mm F2.8)
The aperture controls how much light gets through to the camera’s sensor. More blades is often an indicator of a better quality lens. It also allows you to achieve much nicer looking bokeh when blurring out your background, whereas a lens with less blades will often produce harsher, more polygonal bokeh.
Aperture blades: is this important to you?