Few have attempted filming slow motion underwater and the results are usually underwhelming due to the amount of light needed. The light kits alone can make the undersea wildlife exit in a fast way from apparent danger unless they lack eyes or photo sensors. However with a little ingenuity and keeping frame rates slow but not overly so you can get very good looking footage under the ocean with what amounts to be an entry package.
Chase Darnell did a review for Dive Photo Guide where the Sony RX100 IV is used with the aid of a Fantasea FRX100 IV Underwater Housing. As a diver the review is geared for underwater shooting which is not common when it comes to slow motion. He goes over the pros and cons of the kit and much more.
You can read the full review here at DivePhotoGuide.com!
Congratulations on the great imagery and video capture by Chase Darnell on what could be a great starting dive imagery kit for cost conscious divers who want professional looking results on a budget.
Below you can see the underwater slow motion footage from the review which you should read for even more samples and tips!
Cocos in Slow Motion with FRX100 IV Housing by Chase Darnell from DivePhotoGuide.com:
There is also a 4k RX100 IV underwater reel here which shows the resolution prowess of the little camera.
You can read more about the RX Sony cameras here at HSC!
Sony RX100 IV 4K video highlight reel by Chase Darnell from DivePhotoGuide.com: