lens - Is depth of field and bokeh influenced by distance to the subject?

I know that the aperture size has a direct effect on the depth of field.

However, what about distance to the subject? Let's say I took two pictures, one at 24mm and one at 70mm, using the same lens and camera settings. In post-processing, I crop the 24mm picture so that it has the same field of view as the 70mm picture. Will both of them have the same depth of field and bokeh?

Answer

In your example, assuming you kept the same distance to the subject, the 24mm picture would have more depth of field than the 70mm picture. To keep the same depth of field, you'd need to stop the 70mm lens down until it has the same absolute aperture diameter (so that 24/f-number = 70/other f-number).

In this picture, you can see that a 210mm f/11 lens has roughly the same depth of field as a 35mm f/1.8, when cropped to the same field of view and subject distance is kept constant.