Hi Guys and Girls, Im using a D850 with a 28-300mm lens f3.5-5.6G in Aperture Priority and wondered why I cant adjust the camera aperture down to f3.5. The lowest it will go is f4, yet I can adjust the camera up to f10. Can anyone give me a reason why. The shutter speed with this is 40th if that makes a difference and ISO is on auto. Thankyou.