Thanks for explaining eric, I understand I should have the 150 f/4 now Though I am still in the dark about the 80mm since you have the f/2.8 but all the used ones I've seen mention c f behind it even with f/2.8. The 150 f/4 indeed doesn't have that f. Sorry for not understanding right away, I know it is simple

UPDATE: I've finally found it:
F: indeed is focal plane only (no shutter in the lens)
CF: Is okay since it has a leaf shutter.
C: Cumputer shutter.
FE: Is focal plane cameras only as well.