It is due to the amount of mass the object has.
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All mass attracts all other mass, thats a fact. The force between two independent masses depends on the total mass and the distance between them. The "cause" of gravity is subject to great debate, even today.
... the masses of the bodies involved and the distance between them.
Earth pulls on the object, and the object pulls on Earth
the pull of gravity on a camera is its weight
Weight = Mass x g g = acceleration due to gravity. (g ~= 9.8 m/s2 Weight is a Force and is calculated in newtons(N) or dynes. Mass is calculated in kilograms(kg).