The observation level is glassed in, so if any photos are to be taken at all, they will be taken through the glass. The outside of the glass is prone to dust. On a sea coast like Aomori the problem is compound by fine salt mist evaporating on the glass. The image I took of the city’s bridge and harbor looks grayed-out. … The cure is to grab the arrow on the low end of the histogram and move it up to where the levels of the image start.