02-06-2015, 07:28 PM
Quote:I see Canon people will still be using the Nikon 14-24mm for astro and aurora photography as this is not f/2.8. It is wider, I wonder how big it would have been with an f/2.8 aperture.I'm no BC or Scythels, but roughly:
Area is the aperture, but elements are roughly proportional to the aperture.
+1 stop => 2x the area => 1.414x the diameter
So roughly expect for every stop increase: the diameter of the lens increases 41% and the weight doubles.