Hi - hoping someone can help me. I'm using an AF-S Nikkor 50mm 1.8 lens with a Nikon D7500 in Aperture priority mode, AF-S. Shots at the maximum aperture (1.8) are great - awesome depth of field. However, when I step down the aperture, there is increasingly longer shutter lag and very blurry pics, starting at around f/7.1. At f/16, the shutter lag and blurriness are ridiculous. Anyone know if this is normal or if I need to adjust some camera settings?