The 28-200mm F2.8-5.6 is the first *1 all-in-one zoom lens for full-frame mirrorless cameras to offer a maximum aperture of F2.8. It maintains outstanding performance throughout the entire zoom range, and aperture values of F3.5 at 50mm, F4.5 at 100mm, F5.6 at 200mm. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.