Where did the steps go?
When you have a poor Delta-T environment it can even make a set of steps disappear when looking at them with an infrared camera. Poor Delta-T is the 900 pound Gorilla that must be understood in order for a thermographer to find defects when doing a infrared building inspection. If poor Delta-T can cause a set of steps to disappear, then how much more could it make a moisture spot disappear. Poor Delta-T can make an IR camera blind and the person using the camera will not even know it, if not properly trained. (thanks to Will Decker for the photos)
Here a more detailed discussion on this example of Delta-T at our infrared Podcast page.