A2Matos

Wikipedia has good description about it. It is also called F-Stop. This pic is from Wiki. F-Stop = Focal Length / Diameter of the hole through which light comes (Aperture). In other words F-stop = F/A As the above answer explains well,1 stop = double the light 2 stop = 2*2 = 4 Times the light 3 stop = 2*2*2 = 8 times the light So to change from ISO200->ISO400 is one stop. ISO200-ISO800 is two stops and so forth. Another way of showing stops is by means of focal length, as show in the picone stop = f/5.6 two stop = f/4 three stop = f/2.8 Why is the denominator not the whole number? This is because it is the ration of area. And the ratios

Always you Since we met you give me your hand To embrance a new form of reality The truth is, i dont know why i ignored it Side by side we walk together in this new land A new world full of dreams and oportunity You push me harder until i realise it What is corrected to me, to us and our love It was harder than everything before To look deeper into your blue eyes Understanding and forcing me to see a white dove In that moment i felt we are already far away from the shore Where i started to see and feel your tries Now we are connected and married as one Living our true magic by our true expression Inside and outside of us we do

Mirror I was the guy on this foreign land And never suspected that you can be my twin Always at the same step has mine to make a stand Together we try to be any time and spin But sometimes you act like a mad person I discovered now it was because i never felt you so close Please forgive me, take my hand and we will visit our son A2MATOS © Unique Nature