long Exposures can be fun and are very easy, be prepared to take multiple shots and only expect to get 2/3 useable shots.
Why, you are effectively using your Aircraft as a tripod, but also having to cope with conditions like vibration wind conditions etc.

Using ND filter ND1000 polar Pro
Try experimenting between 1/2. Second to 3 seconds exposure , for this waterfall and because light was low (very cloudy) then 1.25 seconds was enough to get the finished shot I was looking for, if you need less blurry water then less exposure time, to completely freeze the water more exposure time.
It’s going to make your job much easier if you shoot on a calm day, but also the Mavic Air can preform really well in windy conditions, it was approximately 15mph wind the day this shot was taken.
I shot in Raw and edited in Lightroom.

Assenranka Waterfall Donegal Ireland

Hello and good day hallmark007. Thank you for sharing this remarkable photo you have captured from the Assenranka Waterfall in Donegal Ireland. Great work and two thumbs up.

DJI Stephen Posted at 8-10 07:10
Hello and good day hallmark007. Thank you for sharing this remarkable photo you have captured from the Assenranka Waterfall in Donegal Ireland. Great work and two thumbs up.

Cheers Dji Stephen thank you .

Fantastic shot 007. I just order a ND 1000 and can't wait to start shooting

hallmark007 Posted at 8-10 15:33
Cheers Dji Stephen thank you .

You are very much welcome hallmark007. Have a safe and a happy flying always.

Stunning capture

Great photo, nice work

Cool shot and nice tips.  Thanks for sharing.

Nice capture

jacksonnai Posted at 8-11 05:12
Great photo, nice work

Thank you Jacksonnai.

Wow, the long exposure really does create some amazing shots.  Thanks for posting them and sharing your technique.  Has motivated me to try this same concept.....

hallmark007 Posted at 8-12 13:16
Thank you Jacksonnai.

You're welcome!

hallmark007 Posted at 8-10 06:02
[view_image]Assenranka Waterfall Donegal Ireland

Awesome shot

ShermanFlyer Posted at 8-13 10:21
Awesome shot

Cheers thank you .

hallmark007 Posted at 8-14 06:33
Cheers thank you .

You”re welcome

RWD Posted at 8-12 22:25
Wow, the long exposure really does create some amazing shots.  Thanks for posting them and sharing your technique.  Has motivated me to try this same concept.....

Cheers thank you very much .

Cool shot.

Miro Perez Posted at 8-15 13:52
Cool shot.

Thank you .