What is the speed of a insensitive film?
lower speed
What does it require more of?
exposure to light
What is another name for it?
slow film.
What is a fast film?
no
What is a sensitive film?
fast films
So what happens if it has higher sensitivity?
reduced image quality
How does that do to the image?
via coarser film grain or higher image noise of other types
What causes the image to be grainier?
high sensitivity
What is sensitivity limited by?
the quantum efficiency of the film or sensor.
What did the Warnerke Standard Sensitometer consist of?
a frame
What else did it have?
an opaque screen with an array of typically 25 numbered, gradually pigmented squares
What did it connect with?
a photographic plate during a timed test exposure under a phosphorescent table
What was the speed expressed in?
degrees
Was there an abbreviation for it?
Warn. or °W
What did each number represent?
corresponding with the last number visible on the exposed plate after development and fixation.
An increase of 1/3  represented what?
Each number
What were typical plate speeds?
10° and 25° Warnerke