Apparently, this user prefers to keep an air of mystery about them.
5 How does a sensor cause vignetting? Oct 15 '13
4 For night photography with lots of unexposed areas, should I go with high iso and low exposure, or low iso and high exposure? Oct 6 '13
4 Image size of the Sun / Moon from a telephoto lens Sep 27 '13
3 Why is focal length measured in millimeters? Sep 18 '13