Tyler has three eyepieces to use with his refracting telescope, which has a primary lens focal length of 90 centimeters. Eyepiece 1 has a focal length of 25 millimeters, eyepiece 2 has a focal length of 15 millimeters, and eyepiece 3 has a focal length of 12 millimeters. Which eyepiece should he use to have the maximum magnification, and what is the magnification of his telescope when he uses that eyepiece?