slup
Second Officer
Flight distance : 1607103 ft
Sweden
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Kelisko Posted at 10-17 23:53
Yeah. exposure got messed up at some point while filming the hidden granaries in the caves and flying away from the caves. Manual exposure may be tricky. Do you think using ND filters could have helped? I have some but haven't used them yet.
No, a ND filter wouldn't have helped in your case when you had a transition from a shadow area into a highlight area. In cases like that you depends on the sensors dynamic range, which in most cases are to narrow to be able to capture both the deepest shadows to the brightest highlights. It's up to you to decide what to expose for, either keep the darker hill side correctly exposed & when you ascend the sky get's a bit over exposed ... or the opposite, or some middle way.
ND filters are used mainly for two reasons when it comes to video/stills.
The first is to acquire the right amount of motion blur in videos so it looks natural, the thumb rule to achieve that is to use a shutter speed that is double the frame rate, or as close as is possible. Like, 25 fps then use a shutter speed of 1/50th or 30 fps and 1/60th. In order to get a correct exposure at those relative slow shutter speeds you need to block some light entering the camera if filming in bright daylight, otherwise you easily ends up with shutter speeds up to 1/800 or faster. Filter values between ND4 to ND32 is usually used for this purpose. Also note that for drone filming above approx. 30 meters motion blur isn't so pronounced or noticeable anymore & use of the rule "double fps as shutter speed" isn't important ... meaning no ND needs to be used.
The second reason for ND filters is more biased toward still photos. If you want to create excessive motion blur in daylight conditions in order to for instance smooth out streaming water you need shutter speeds as slow as 1 or 2 seconds ... to achieve speeds as slow as that during daylight you can use ND1000 filters.
ND filters mainly do only one thing ... shade out light, it will not equal out light differences between a shadowy hillside & a bright sunny sky... with one exception
Graduated ND filters ... it's a filter that have the top half darker then the bottom half. The use of filters like that is more for still cameras on tripods were you can align the darker top half on the bright sky & the lighter bottom half towards the darker ground in the composition, meaning the filter evens out the light differences in the picture. Not sure that that kind of alignment is easily achieved when flying a drone ... or if you can buy graduated filters for drones. |
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