Vlado7
lvl.1
United Kingdom
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yoengel Posted at 2017-2-20 20:05
Did you know that you can pause the video to see the motion blur?
I normally shoot during sunrise and sunset where I don't need ND filters. The point of using ND filters, is to reduce the shutter speed if you were out shooting in the middle of the day. Being in the middle of the day, there was a very wide dynamic range which resulted in under exposing the foreground. Do you understand?
I think heriedo's reply totally makes sense. I also thought the same when watching the video. But thank you anyway for this test - it does help.
If the image doesn't change much (like the grass or water) within a time frame, either because your drones is far from the subject or the objects don't move (or combination of both), it's hard to see the benefit of the ND filters.
What you also haven't included is the FPS.
In other words, say if you use 1/1000 shutter speed and for argument sake 25fps, each image (= frame) will be captured (=exposed) for 1 millisecond. So 25 images, each for 1 millisecond, so in total out of 1000 milliseconds, the camera will have it's eyes open for 25 milliseconds. Or in other words, within one minute each image will be taken for 1 milliseconds with ca. 39 milliseconds gaps between each image. When filming water or grass etc., there is not much happening in these 39 milliseconds so to day. But if you fly close over trees (looking down) or let's say many buildings, you will get a strobe effect.
I think the optimal shutter speed value is x2 to x3 the FPS, which the ND filters allow you to set. |
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