Thanks for sharing that. What does the filter do for your image? I'd imagine a filter like that would force the camera to work at higher ISOs for a given ambient brightness, and/or slower shutter speeds. Is that about right and what does it contribute to your overall fab 'look'?
The filter slows down the shutter speed to something closer to 30fps with a higher f stop, which is more realistic and film like. Without one, which I did today, I find the video less pretty. Also, it removes all evidence of prop shadow and you are less likely to experience glare or blown out highlights.
Photographers that are new think everything can be done in post. I have to tell tell you, filters are an important part of video production, and professional still image department. At a minimum, but the Polar Pro 3 pack for your GoPro. For your still camera (where you still shoot video) work, a variable ND filter is a must and a circular polarizer. You will be amazed at how much more control you have over your final pictures and video.
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I found GoPro Studio on my Mac quite unusable, so abandoned it and use iMovie instead. By the sound of it, I'm may be missing out on the ability of the GoPro Studio software to correct fisheye etc.
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I encourage you to give it another try. If you shoot in protunes, you are recording in a codec by the company Cineform. That is not a format you want to use in editing, or finishing. You need something to convert it. Now most macs will have the Cineform codec installed, but unless you pass it through GoPro studio twice, once to convert it from the Cineform codec, which also includes the step of removing the fisheye. Then, using the edit and export tab, you can select several presets, one called Protune that you can select and then tweak using the other controls. I've done it a lot on a Mac. There is no problem.
Hope this helps!
Happy and steady flying to all!