That means wide aperture lens ideal , something stops open wide f/1.4 , f/1.8 , f/2.8 let light camera.Camera systems allow interchangeable lenses offer best options 's often possible get lenses wider maximum apertures fixed-lens systems.Some lenses shoot wide f/0.95 ! What ISO setting use low light ? A camera 's ISO sensitivity range makes probably biggest difference taking well exposed low-light image , lens ' aperture rating.ISO refers image sensor 's sensitivity light , denoted tens , hundreds , thousands , up.In bright conditions plenty light setting ISO 100 ideal minimises amount image noise.But 's darker higher ISO compensate loss light still produce good exposure.The higher camera ’ maximum ISO setting , capable low light – though image quality levels vary dynamic range decreases image noise creeps go .