A valid question on how much the change in aperture affects depth-of-field, is whether an 70-200mm f/4 zoom would give you the same kind of look that an f/2.8 zoom would.
For me, a fast f/2.8 aperture is essential on a zoom lens, especially the telephoto zooms. For the same scenario, it gives me a higher shutter speed than the f/4 zoom. Or I can use a lower ISO. More importantly, since I often bounce flash in large areas, the f/2.8 aperture gives me more chance of successfully bouncing my flash than an f/4 aperture would.
creating a background with narrow depth-of-field & great bokeh
Shooting images for the review of the Nikon 85mm f1.4G AF-S lens, it struck me how truly superb this lens is. It improves on the legendary Nikon 85mm f1.4 AF-D lens in some key areas. (For me the updated lens was an immediate upgrade.)
But ultimately, you could get similarly beautiful images with any short portrait lens that gives you a very narrow depth-of-field AND has great bokeh. (Just to reinforce that again .. narrow DoF and bokeh are not the same thing. But I digress.) So, whether you're shooting with a Read more inside...