Ok so probably most know what noise is and the fact that the lower the ISO you use the lower the effects of said noise.
The subject of noise continues to fascinate me as in the days of film grain (the equivalent of noise) was often seen as a positive element of an image as it added a certain gritty feel to the image. Now a days noise considered a most undesirable effect so much so that camera manufacturers have spent millions on producing cameras that reduce noise to achieve incredible results. It´s a kind of grain is good, noise is bad kind of situation, despite the fact they are very similar. I assume the change in opinion has much to do with the fact we are are now viewing images at 100% on big screens rather than through a loupe on a lightbox and therefore see every tiny flaw. It´s also worth noting that film grain, unlike digital noise, tends not to introduce any extra colours as can be seen below.

Modern DSLRs and software have come along way in recent years to reduce the unwanted effects, I just wander that if in a few years time we´ll look back on these images in the same way as we look back on a grainy black white print shot on Ilford 3200.
That was day







Yesterday I bored a fair few of you with 





















