A film with an ASA speed of 200 is how many times faster than one with a speed of 50?

To determine how many times faster a film with an ASA speed of 200 is compared to one with a speed of 50, you can use the relationship between ASA (or ISO) speeds. ASA speed is a measure of a film's sensitivity to light; a higher number indicates greater sensitivity.

In this case, you can compute the ratio of the two speeds:

• ASA 200 / ASA 50 = 200 / 50 = 4.

This means that the film with an ASA speed of 200 is four times faster than the film with an ASA speed of 50.

When you increase the ASA number, you are effectively increasing the film's sensitivity to light, allowing for quicker exposures in the same lighting condition. Thus, the correct understanding leads to the conclusion that the film rated at ASA 200 indeed has a sensitivity that makes it four times faster in capturing images than the film rated at ASA 50.