Crossword Genius

Like a point of interest to a photographer? (5)

Ross

I believe the answer is:

focal

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But I can't explain it at all! Could you help me understand?

(Other definitions for focal that I've seen before include "- length characterises a lens" , "Things are concentrated at such a point" , "Relating to point of concentration" , "-- Length, -- plane; -- point" , "Of the point of convergence" .)

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