Even the most modern "ultra high performance" 50 mm lenses still have a Double Gauss lens at their core. For example, here's the Nikon Z 50/1.8S: https://imgsv

Even the most modern "ultra high performance" 50 mm lenses still have a Double Gauss lens at their core. For example, here's the Nikon Z 50/1.8S: https://imgsv.imaging.nikon.com/lineup/lens/z-mount/z_50mmf18s/img/lensconstruction.png https://imgsv.imaging.nikon.com/lineup/lens/z-mount/z_50mmf1... Doesn't take much guessing where the aperture is in this lens.