ALL-IN-ONE PLANNING APP FOR LANDSCAPE PHOTOGRAPHERS QUICK USER GUIDES Exposure Exposure 1 With the auto-exposure (AE) in modern cameras, many photographers started to forget the concepts such as exposure value, exposure triangle, and exposure compensation as they depend on the camera to do it for you. However, knowing the exposure is still key to successful photo shots. The Exposure page will let you experiment the exposure settings beforehand, so that you don’t need to fumble with the camera settings while the perfect timing lapsed before you. Choose Exposure Mode Exposure Value at ISO 100 Exposure Compensation With ND Filter or not Exposure value (“EV”) represents equivalent combinations of lens aperture and shutter speed that result in the same exposure for given lighting conditions. For a given ISO speed of the film or sensor, EV corresponds to a specific light level; by convention, values are given for ISO 100, and indicated as “EV at ISO 100” or sometimes “EV100”. See the Wikipedia article Exposure value for more information. In the PlanIt, “EV” always means “EV100”. 2 Shutter Speed Aperture Exposure Triangle ISO 3 What does this mean? It means in a scene with exposure value of 15, if you are using shutter speed 1/250, aperture f/8, ISO 100 to take a picture, you will get a picture that is 1 stop over exposed. You may ask, how do I know the exposure value for the scene is 15? Answer: It is mostly by experience but this app can help. Exposure Value Let’s review some typical exposure settings. 1 3 Sunny 16 rule: On a sunny day and with ISO 100 film / setting in the camera, one sets the aperture to f/16 and the shutter speed to reciprocal of the ISO. For example if the aperture is f/16, the ISO is 100, then the shutter speed would be 1/100 of a second. 2 See below. It means the exposure value for the sunny day is 14.6. Looney 11, 8, 5.6 rule: On a clear day and when the full moon is high in the sky, with ISO 100 film / setting in the camera, one sets the aperture to f/11 and the shutter speed to reciprocal of the ISO. For example for the full moon, if the aperture is f/11, the ISO is 100, then the shutter speed would be 1/100 of a second. If the Moon is a gibbous or half moon, change the aperture to f/8. If crescent moon, change the aperture to f/5.6. Night Skyline rule: For city skyline at night, one sets the shutter speed to 30 seconds, aperture to f/8 and ISO to 100. 4 Milky Way rule: For milky way photo at dark night, one sets the shutter speed to 30 seconds, aperture to f/2.8 and ISO to 3200. Exposure Value for Some Typical Cases From the previous page, you should have some ideas of the exposure values for some typical cases. Exposure Value at ISO 100 1 If you tap on the Exposure Value, you will see a list of exposure values and the corresponding scenarios. I highlighted four of them. Those are exposure values used on the previous page. You may want to capture two subjects with different exposure values, i.e. a full moon at EV 14 and a night skyline at EV 1. The difference is 13 stops. Modern cameras can capture up to 10 to 11 stops, which means there is no way you can capture both in one photo without one over exposed or the other one underexposed. Knowing that beforehand, you will be well prepared to take two photos using different exposure settings. 2 ND Filter Calculator Tap on the Manual or the first button on the Exposure page to choose a different mode. Choose Exposure Mode 1 Select the ND Calculator, you will see the calculator below. 2 3 Tap the shutter speed on the first row to choose the shutter speed before adding the ND filter. Tap on the filter button to choose the ND filter, the shutter speed on the second row will be the shutter speed after using the ND filter you choose. Scene Exposure Mode So far, you may notice the exposure page has nothing to with the current time or the map below it. That’s right. But if you choose the Scene Mode, the map and the current time will be used. Simply speaking, the Scene Mode provides the suggestion for the exposure settings based on the current time and the location considering the Sun and the Moon elevation. Note the time of the day and the EV value. The EV value was set by the app when the time changes. 1 A clear day at daytime EV = 15 A clear day at Sunset EV = 5.5 A clear day at blue hour starts EV = 1.6 A clear day at dark night starts EV = -6 Scene Exposure Mode – Other Subjects You can also tap on the EV value to select a different weather condition or subjects. For example, an overcast day would have different exposure than a clear day. If the correct exposure for a moon is certainly different from the exposure for skyline at the night, event they are at the same time. Skyline at Night EV = 1 Moon as subject EV = 14 Stars as subject, but this exposure setting will cause streaks EV = -5.0 Stars as subject, no more streaks EV = -5.0 Light Meters We embedded an incident light meter and reflected light meter in the Android version of the app and only the reflected light meter for the iOS version. These light meters are not meant to replace a professional light meter because it can not detect low light very well. Anything below EV 1 are not accurate. Read Exposure Settings from a Picture The last mode in the Exposure page is the Picture mode. It loads a picture from your phone and read the exposure settings (part of the EXIF) from it if they are available. Tap here to load a picture 2 3 1 These three values are read from the picture. The EV was calculated from them automatically. 4 This message means the EXIF is available. If not available, it will show the message here.