I'm not sure if its expressing myself properly, but I'm looking for some information regarding lenses and angle of view. Basically, let's say I have a 12mm, what will be the angle of view? I think it will be close to 90 degrees, but not sure. The same applies for 14mm, 25mm, 45mm and 75mm.

Here's a calculator that should give you what you are looking for (just be sure you select "Four Thirds" in the format selector at the bottom): Lens Angle Calculator

Just be careful with angle/field of view simulators - the field of view a particular lens length will give is solely defined by the sensor size. A 12mm lens on a :43: camera will give a different field of view to a 12mm lens on a full frame.

It depends how you measure it - the sensor aspect ratios are different, so you will get different FoV multipliers depending on whether you measure width, height or diagonal. Traditionally, it is diagonal that is used, but if you want the exact conversion factors they are: landscape: 17.3 : 36 = 2.081 portrait: 13 : ~24 = 1.846 diagonal: 21.6 : ~43.5 = 2.014 Take your pick

True Basically, the crop factor for the diagonal ignores that the two formats have different aspect ratios. The crop factor derived from the shorter dimensions is appropriate when comparing m43 full image to a 35mmFF cropped to 5:4 aspect ratio. The crop factor derived from the longer pair of dimensions is appropriate when comparing m43 cropped to 3:2 to a 35mmFF uncropped.