Where's our 12-300 F/1.4 lens?
Fast lenses have always been desirable, but here in the internet age, we're a bit spoiled. In fact, I saw a comment on another site calling the new Canon 100-400mm F/4.5-5.6 II zoom lens a "door stop" because it wasn't fast enough. Comments like that suggest that there are people out there who don't actually know what F number actually represents. This handy video from Matt Granger does a good job exploring the topic.
