Dpreview on the pro and con of the 2.8 vs 4.0 aperture
Dpreview delves into the differences between a 2.8 and 4.0 aperture in more detail.
The problem with the F2.8 zoom is that it’s more than some people need or can afford. That's where the F4 zooms come in, promising similar features and quality in a smaller, lighter and above all more affordable package. For many, getting a sharp, perhaps weather sealed lens at about 50% of the price is an attractive option.
The price difference between the two can be significant. If you're in the market for a new lens and are unsure which one to buy, this article is for you.
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