This series is a range from XF10mm in the first one then XF16mm all the up to the end of the XF100-400 at various focal lengths. Going out to a for reaching 560mm which starts to have issues with general air pollution and haze.
The 560 is reached with the 400mm and the 1.4xTC - so an X focal length of 560mm or converted to conventional 35mm this would be equal to approximately 840mm. There is a street sign sort of lower left of center which I zoom in on as we look at the high power view.
Here is 400mm - and then below 560mm. I need to do this again with a more interesting subject.