In a small room, glass reflects light and appears to give depth of field to a wall.

This provides control over focus, depth of field, and perspective.

And the more light you let in, the shorter the depth of field.

Put another way, it's the place to focus on if you want to get the most depth of field in your picture.

With standard equipment, you don't have as much control, not nearly the depth of field.

The camera also has a similar light range and depth of field to film cameras.

Because the scene is always shifting, the more depth of field the better.

Maybe the depth of field you might argue is not as deep.

For one, it had much less depth of field than I was used to with my 50.

What intrigued her, she said, "was trying to make a book with a depth of field that you could look into."