Cold weather shutter

You can remember a numerical value, such as 10: 00 a.m. to 3: 00 p.m., spring (or autumn), and when the weather is clear, you can use the aperture of 16 and the shutter of1/00. There are four factors: time (10: 00 a.m. to 3: 00 p.m.), season (spring or autumn), weather (sunny day) and object (ordinary scenery). Then it changes roughly according to the following rules: at 9: 08 am, every hour forward, or at 4: 05 pm, every hour backward, the aperture is enlarged by one step (or the shutter is slowed down by one step-the same below); The aperture is reduced by one file in summer and enlarged by one file in winter; The weather is fine, thin clouds cover the sun, and it turns cloudy, and the aperture is reduced by one file each; The object enlarges the aperture through close-up or bright environment (such as seaside and snow scene). With this transformation, you can basically shoot for entertainment. Aperture and shutter can be used together. If you enlarge the aperture by one step, you can also slow down the shutter by one step (that is, increase the exposure by one step) without moving the aperture, and so on. In fact, "Chen Gongzi-regional president" is the simplest. A form is printed in the box of film for reference. You know, the exposure of the upper and lower files is different, and there is no waste.