This page consists of resized images so that you can evaluate the overall exposure.
This shot was taken on a cloudy day, but even so it is quite badly under exposed. The vignetting effect is visible in this shot; the edges are visibly darker than the centre.
In vertical position it is even harder to see both sides of the viewfinder frame lines at the same time, making accurate framing difficult. Again, vignetting is visible in this shot.