Flytcam_Shaun
lvl.2
United States
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ISO is the sensitivity of the sensor. The higher the ISO the more the sensor will amplify the incoming light on the collectors. The drawback to ISO is that if it is too high you get noise. In bright day light the ISO needs to be low unless you have ND filters. DJI just did something interesting with the P4P camera and that is they locked the ISO at 500. Why is that? Because 500 is probably the native ISO for that 1" sensor. What this means is, this is the point where the sensor will have the most dynamic range (DR). DR is how is the range of light the camera can resolve without losing details. Cameras with high DR will have the ability to bring out details in things like shadows while exposing for a shot such as this one. Next is shutter speed. Shutter speed is how long the sensor stays open. The higher your shutter, the less light you sensor sees and longer your shutter the more light it sees. These are two elements in your exposure. They tie into a concept called stepping up or down the light by what is known as a "stop." In photography if you increase your exposure by one stop you are doubling the amount of light being resolved. If you close down a stop you are cutting the incoming light in half. Now, how do you know what a stop is. If you double your ISO you are increasing a stop. If you double your shutter speed you are decreasing a stop. If your ISO is 100 and your shutter is at 1/25th lets say. If you increase your ISO to 200 you have doubled the light if you do nothing to your shutter. If you were to double your shutter to 1/50th you would go back down a stop and your exposure would be the same as it was before. Each ISO stop would be in this interval 100, 200, 400, 800, 1600. For shutter speed 1/25, 1/50, 1/100, 1/200, 1/400, 1/800, 1/1600, 1/3200, etc. Now of course you can close down or open up smaller intervals like you can set the ISO to 600 which would be a 1/2 stop after 400.
One last item. Unless you have a Phantom 4 Pro/Adv Inspire X5/X5R/X5S/X4S. You don't have another parameter called aperture or the Iris. These mentioned systems have those where you can close or open a stop by making the aperture larger or smaller. With things like a P3 and P4 you have a fixed iris at f/2.8, which is fairly open. With these cameras you may want to invest in ND filters, which there is a whole explanation on in this forum. |
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