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CTS · Question #178
If the nominal light output of a projector was measured at 5000 ANSI lumens using an f/1.4 lens, what would happen if the lens was changed to an f/2.8 large zoom?
The correct answer is A. The projected image will be darker. See the full explanation below for the reasoning.
Audiovisual Design
Question
If the nominal light output of a projector was measured at 5000 ANSI lumens using an f/1.4 lens, what would happen if the lens was changed to an f/2.8 large zoom?
Options
- AThe projected image will be darker
- BThe projected image will be brighter
- CThe screen will need to be changed to 1:1 gain
- DThe screen will need to be changed to a high contrast screen
How the community answered
(36 responses)- A72% (26)
- B17% (6)
- C8% (3)
- D3% (1)
Topics
#projector lens#f-number#light output#optics
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