Question

Regarding movement (motion) unsharpness:

a. It can be reduced by immobilization

b. It can be reduced by using a short exposure time

c. It can be exaggerated by increasing the object-to-film distance

d. Increasing the focus-to-film distance always decreases movement unsharpness

e. Shortening the exposure time to overcome the motion unsharpness may contribute to increased geometric unsharpness

Answer 1

a. True. However, this may not always be possible (e.g. in case of movement blur due to heart beating).

b. True.

c. True. In this case, the same amount of object movement will translate to a larger distance on the film.

d. False. It may increase motion blur as it necessitates increased exposure time.

e. True. This is because to expose the film in a shorter time, the tube current needs to be increased, which may require selecting a larger focal spot. The size of the focal spot may also increase with a higher tube current due to the blooming effect.