Showtime Sets Premiere Dates for Shameless and More. Aug 7, 2017 8:45 PM EDT. Showtime has set the premiere dates for its fall comedies. Shameless will return for its eighth season on Sunday, Nov. 5 at 9/8c. The season will find Frank (William H. Macy) trying to be a contributing member of society and Fiona (Emmy Rossum) discoâ¦ Read more.
Making the world better, one answer at a time. The f on a camera lens is the maximum aperture of the lens. It is sometimes listed as 1:X with X being the maximum aperture.
A 100mm lens has to have a maximum aperture of 50 mm to be an f/2, and if it has a maximum of 25mm it is a f/4. So if you divide the focal length with the f number you get the aperture. And an aperture that changes to half its size will let in a quarter of the light amount.