Q. Would you mind sharing how you take those waterfall photos?
A. ok, here you go... you're going to need a few items..
1. The Olympus CLA-T01 Conversion Lens Adapter https://amzn.to/2KNzQhD
Here is an aftermarket version https://amzn.to/2xehtiO
2, A Neutral Density Filter https://amzn.to/2WbyLWg
3. Good Idea to put a lens shade on that so you'll need a step-up ring to prevent vignetting and the hood
step ring https://amzn.to/2Sgts6G hood https://amzn.to/35eXxsI
That's what you need I do it a little different
I use a circular polarizer on first, then the step-up ring, then a 49 mm ND filter, and then the lens hood
Now for the camera settings!
Ues the A aperture mode. Set the f/8 and the ISO should be at 100.
Find a rock or fallen tree or use a tripod and set the self-timer for 2 sec so you won't move the camera during the long exposure...
My set-up
(https://www.brfff.com/btwc/ff2020/04/slowshutter-1.jpg)
Oly ring - polorizer - step ring - ND filter - Lens hood
(https://www.brfff.com/btwc/ff2020/04/slowshutter-2.jpg)
(https://www.brfff.com/btwc/ff2020/04/slowshutter-3.jpg)
(https://www.brfff.com/btwc/ff2020/04/slowshutter-4.jpg)
hope this helps!