Image No. 1. Note the detail in the upper right corner is intact, while the detail near the terminator at the lower left is lost in the shadows.
Image No. 2 is close to properly exposed but there is still lost detail at the lower left.
Image No. 3 is overexposed for the bright area at the upper right, but this was necessary to bring out the detail at the lower left.
Wouldn't it be great to have a single image that captures the wide dynamic range of values that no single exposure can? The last image is a 'merged' image of the above three images. There is plenty of detail at the lower left terminator and, Voila!, the bright highland area at the upper right is properly exposed.



