How to change the sensitivity of the camera on the Samsung Galaxy Grand Prime?

I have bought galaxy grand prime plus that has an 8 megapixel rear camera, the camera looks good put once you take a photo and see it it looks like it's blured or bad quality i showed it to a friend and he said that the sensitivity is very high, when he tried to put the camera on a surface that doesn't move at all the pictures were great. i looked for an app that fixes this problem since i found no such option to lower the sensitivity in the settings and i can't find one could you please help? the android is marshmallow

I think you're pertaining to ISO, try to adjust it. Let us know if that's what you're looking for.

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