it is how manay photographs you have to take in order to complete the objective, as far as I know. The Lifeguard duty objectives works in a similar way, EG: you can set a minimum that need to be rescued.
I've not had any problems getting it to fire. Setting it to zero though is a bit weird as I'm sure the game flags the objective as complete as soon as you reach your min number. I wonder why they did that? A typo perhaps.
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