How does defocusing a telescope image assist in observing stellar color?
Answer
It spreads light to trigger cone cells
Slightly defocusing a telescope image spreads the point of light over a larger area on the retina. This technique increases the brightness density in one specific spot, which provides enough stimulation to trigger the cone cells. Since cone cells are responsible for color perception, this activation makes the subtle hues of a star more apparent to the observer.
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