D-Type NIKKOR Lenses, like this AF Nikkor 85mm f/1.8D Lens, have an aperture control ring that can be used to manage aperture on older Nikon SLR cameras. When used on a DSLR, the aperture control ring needs to be locked at the smallest possible aperture (generally designated in orange), and the aperture control is maintained through the camera's command dial. The D7100 allows you to switch aperture control to the aperture ring when shooting in "A" or "M" mode. To do this go into your Custom Settings Menu and navigate to f5:Customize Command Dials, then change the Sub-command dial setting to Aperture Ring. For more information see page 257 of the D7100 Reference Manual which can be downloaded from here: https://support.nikonusa.com/app/an...
answered 1 month, 2 weeks ago
1 month, 2 weeks ago