Micro four thirds - does the crop factor apply to MFT lenses as well?

schirmer wrote:

For a perfect image one has to

1. get the framing right
2. use the right overall exposure
3. choose a suitable shutter speed
4. choose the right F-stop for DoF
5. consider noise limitations
   

The crop factor helps to select the right focal length using the common 135 film area scale for right angle of view (1).

F stop on lens is used for right exposure (2+3)

Applying crop factor to F stop and ISO is useful for points 4+5 above. It isn't always possible to satisfy all requirements here. E.g. large DOF, lens wide open, fast shutter and low noise won't work in any system. One has to choose the right tool depending on acceptable compromise(s)