The Nikon EM loads similarly to most SLR cameras. For a great resource and step by step instructions, check out http://www.nikonians.org/, it is a community for Nikon camera support.
To adjust the aperture on a Nikon camera, turn the command dial to select the desired aperture value. The aperture setting is typically displayed on the camera's LCD screen or in the viewfinder.
I would recommend Nikon D5000 camera a newer version of Nikon D60
There is a difference between the Nikon camera and the Sony camera. The Nikon camera has more features and it is also wireless. The Sony camera is digital.
The Nikon D3200 camera is compatible with Nikon F-mount lenses.
The Nikon D3200 camera uses a Nikon F-mount type.
The Nikon D90 camera uses a Nikon F-mount type.
The Nikon D3400 camera has a Nikon F lens mount.
and nikon camera can use a nikon lens, try a D3000, a D50, or a D9
A Nikon EM has a standard Nikon mount, so you can use any lens that'll fit on a Nikon, except for a Nikon Series G lens, on an EM. A Series G will fit but it won't work because there's no aperture ring.
The resolution of the Nikon D750 camera is 24.3 megapixels.
The Nikon D3200 camera uses the Nikon F lens mount.