Image resolution for photo contest and after image submissions should be at least 2,500 x 3,000 pixels. For image of the week, 1500 x 1500 pixels is sufficient. File formats .gif, png, and .jpg are accepted.
For your image description, please describe in one or several sentences the optical phenomenon pictured in, or optical interest of, the image being submitted. Also, please provide, as appropriate, specific information about any optical equipment being used, details of interest regarding how the image was captured and processed, and the location where the image was captured.