One part of my photo interests is astrophotography,which means long exposure pictures. The theory says (correct me if I am wrong ) that instead of taking a long exposure picture , let's say two minutes,it's better to take 4 pictures X 30 secs each( using stacking methods ) , that's because we get noise reduction and generally better pictures.
But what I don't understand is,that , how it's possible to get the same picture info, (so important from the dark sky )of 30 secs exposure even if we get it four times,when
2 min exposure means more light and info coming to the camera.
My opinion is that stacking methods of many short exposures can not replace a long one in the field of picture info .
Could someone tell if I am right or not please.