How to shoot tunnel effect with LOMO camera?

This is the effect of off-diagonal fisheye lens.

Not all fisheye lenses can produce this effect.

The diagonal fisheye lens can't shoot this effect (there is no black box around the diagonal fisheye lens)

You must use an off-diagonal fisheye lens to shoot the black frame.

2. As long as it is a full digital SLR and fisheye lens (note the difference between fisheye lens and the additional lens of fisheye lens), this effect can be achieved without ps.

The landlord should make up the basic knowledge.

4. In addition, the fisheye lens is super wide-angle, but the super wide-angle lens may not always have the effect of fisheye lens.