1. What does f/1.8 and other f/ things mean?
2. Point and shoot cameras have the optical zoom like 6x written somewhere. How do we know the magnification from the lens' focal length?
3. What does shooting wide open means?
4. How do I vary the dof?
5. What are primes?
6. How do u tell a picture is sharp or unsharp? Any samples for comparision? How sharp is sharp?