You also need take account pixel count cameras smaller pixel count use larger individual pixels better gathering light information.That said , get APS-C cameras excellent low-light.You need weigh important camera system.Cropped sensor cameras often smaller , lighter , portable smaller lenses intend travel lot times , might idea think too.Lenses Most cameras 've included interchangeable lens cameras.This lens choose often determines much light let based maximum aperture.You 'll want lens wide aperture f/1.4-f/2.8 want shoot mostly hand-held.Of course , 're planning shooting night skies example , 'll shooting using tripod bulb mode aperture n't matter much 'll letting lot light super long shutter speeds .