Okay, I got my AF-S 35mm 1.8g for Christmas and this is my second lens and my first one is the AF-S 18-55mm 3.5-5.6 so obviously this is a big transition for me because of the aperture. I notice that everytime I take pictures of 2-3 people in one photo, usually there's only one person that gets focused. This was when I was taking the pictures with f/1.8 so the next time I had a chance, I changed it to 3.2 or to 5.6. Regardless, I still have the same results at times, but not as often, so I read this thing about finding the sweet spot of the camera and I THINK mine is f/9 or f/11(I tested this by taking a picture of an article in different f-stops until I got everything clear). I also tried doing shutter priority so that the lens will just choose the right aperture for my those 2-3 people shots but it did exactly the opposite that I think the aperture goes near to f/1.8. So my questions: -What is the right aperture for 2-3 people regardless of the lighting? -When do I use the sweet spot? -Is there a constant sweet spot value for each lens?If so, what is the value for the 18-55mm? Thanks!