Hi, I am a newbie to photography. May I know what do the numbers like 35mm lense means? I own a BenQ DC2300 and its specs says focus/macro = fix / 1.3m / 18cm, what does it mean? Does it mean the camera has to be 18cm away from the subject or below 18 cm from the subject or more than 18 cm from the subject or something else totally? And for the lense it's written as 5.6mm . What does that number represent? Thanks for any helpful replies