Optics
The SM7's Galilean Optics show a 7:1 Zoom system, resulting in a standard magnification range of 8X-56X. A 10-Position Click-Stop helps to set precise magnifications. For the best image results, a 1X Plan-Apochromatic objective with a W.D. of 81mm is available: 36% more resolution power and improved Field Flatness are obvious.