Graduated filters are expensive and we often forget to bring them with us. What to do if we are out already and need to use a graduated filter for a sunset scene?
The process is very simple: you only need to have something opaque (like a credit card, or even your hand!!) and place it where you want to expose less. For a sunset photo, you will put the card covering the sky, while the foreground will be exposed properly. Then, you will slowly raise the card when the sky exposure should start. After a couple of trials, you will get the perfect shot!