Despite slight haze inside the lens, I didn't have the hazy problem I thought I would, thanks to the very long and effective lens hood I used, which measured at 11cm, almost as long as the focal length of the lens. Like many old classic lenses, this one does not have high contrast at larger apertures, but is very sharp at full aperture. It's definitely usable at f4. I am quite taken by the nice rendering of the pictures, but what makes this lens special is the history behind it.
Lenses like this one were used for aerial reconnaissance in World War II by the British Air Force (Air Ministry). Just imagine for a moment, that this very lens might have been used to photography the enemy and provided intel for the allies, and is very likely part of the significant history as we know it. On the other hand, what history does your auto focus lens have? Not much, I think.
Air Ministry [Ross Xpress] 5 Inch f4 on helicoid. Taken with 5D II & Tamron 90mm f2.8. Click for larger.
The Imperfect Tulip - Canon 5D Mark II & AM [Ross Xpress] 5 inch f4. Click for larger.
Bokeh - Canon 5D Mark II & AM [Ross Xpress] 5 inch f4. Click for larger.
Bokeh 2 - Canon 5D Mark II & AM [Ross Xpress] 5 inch f4. Click for larger.
The silver lining - Canon 5D Mark II & AM [Ross Xpress] 5 inch f4. Shot through windshield.