Hi everyone. I just joined this forum and I have some basic questions about photography. 1. Why has the SLR become so popular? 2. What does SLEV stand for? 3. What are the main types of sensors? 4. Why did 35mm film become so popular? 5. What final print image size can you get with a 12 mega pixel camera? 6. What is the largest range of ISO that a camera is likely to have? 7. What is the difference in image quality when you stop down from ISO 25, 600 to 1600? 8. How do different sensors affect exposure with an SLR when you get into low light conditions? 9. What are the types of light meters in a camera? 10. What is the best light meter setting for a camera? 11. What do histograms show about pixels? 12. When are histograms most useful? 13. How does a focal plane shutter work? 14. Why are leaf shutters used in simple point-and-shoot cameras? 15. What is full stop of light with shutter speeds? 16. What setting should you leave your camera in, when it comes to white balance? 17. What format should you shoot in when shooting in jpeg? 18. What events are fast cards used for? 19. How often should you reformat your card? Thank you!