I have a 18-55mm zoom lens with no Infinity symbol on it. Let's assume I want to capture stars in night. There are three ways to do it (If I am not wrong)
- Use Auto focus (If your camera is able to set it)
- Use manual focus
Use focus point to set focus
Auto Focus: Now, What if I set my lens to Auto focus and put it to lowest F-stop (No zoom) number Is it not equivalent to setting infinity focus because I am allowing lens to capture the maximum light and allowing light to hit lens in parallel way?
Infinity Focus: As I mentioned that I don't have infinity sign on my lens. So, I set my lens on MF mode and rotate focus ring in clockwise (Assuming Infinity is on that side) and the zoom ring is exactly at the same position (same f-stop number) as I had in Auto focus mode. Isn't it going to capture the same image like I am having in Auto focus?
Last question is What is the use of 8-focusing point in Night photography? Will it play role when I have to capture only Moon (Assuming I am able to set the focus point on moon in night)?