Do I need a F1 4 lens?
If you’re sufficiently far away from your subject, then using f/1.4 would result the majority of your subject being in focus. If you have a high performance AF system (something like the 7D perhaps), then you’re more likely to keep the point of focus exactly where you expect.
Is f1 4 good for portraits?
The f/1.4 image looked softer and a better choice for a flattering portrait. Since I was shooting in available light using the Sun-Swatter, changing exposures was easily accomplished by simply changing the aperture setting in aperture mode.
What does an f1 4 lens do?
A lens that has a maximum aperture of f/1.4 or f/1.8 is considered to be a “fast” lens, because it can pass through more light than, for example, a lens with a “slow” maximum aperture of f/4.0. That’s why lenses with large apertures usually cost more.