Crossword Genius

Like a point of interest in photography? (5)

Ross

I believe the answer is:

focal

I'm a little stuck... Click here to teach me more about this clue!

'like a point' is the definition.
(I know this)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for focal that I've seen before include "Type of length or point" , "Relating to a centre of interest" , "and 21 Across: Centre of attraction" , "sort of length" , "Things are concentrated at such a point" .)

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