I realise that there is noise at ISO 100 - 200 photos
During night or lowlight it can get pretty obvious at 100% zoom
However I realise that level of noise is lower if I were to give longer shutter speed
Currently using a 400D with 18-55mm kit lens
I understand that this might be a common question (after some searching, I still don't quite get it)
What are the factors that actually affect the noise (other than ISO)?
Does using a faster lens actually allow for almost noiseless photo?
Am I doing some setting/photographing techniques wrong?
Why is it that I can find sample night photos from 400D online that is almost noise-free and looks almost perfect?
Hope to have some advice.