Scopes and binoculars have similar lenses. Normal lens size variates from 50 to 80 mm. However, the main distinction among scopes is admitted to be the inner construction. Usually, two major design types are distinguished. Both kinds have their pros and cons, and one should keep them in mind when choosing a device. The first one - straight - puts the lens on the same level as the focal point. This device is used for tracing fast-moving targets, and is more suitable for direct-line spotting, or viewing objects below your level. The second one - angled - is more common when spotting an object in the sky (birds or stars), and is more comfortable if using over a long period of time. You can buy scopes suitable for your specific needs at the best prices - only on Mega Depot.