I tested this wonderful close-up lens underwater. The photo on the left was taken with two layers of MPCU-02/f=100mm+PTMC-01/f=165mm.
The photo on the right was taken with the new close-up lens UWL900PRO /+23.5.
A small shrimp with a body length of about 10 mm.
You can feel the power of this close-up lens. You can get sharp images without bleed even at high magnification.

 I can’t let go of this close-up lens anymore.

Camera: Olympus E-M1MKⅡ
Lens: ZD50mmF2.0Macro+EC20&MMF-3
Light source: RGBlue System-03PC

AOI UCL-900 PRO
Description
Underwater +23.5 Close-up Lens
Material Hard Anodized Aluminum Alloy Barrel
5 Lenses Elements in 3 Groups with Multi-layers AR Coating
Waterproof 60 Meters
Weigh 326g (on land) 208g (underwater)
Dimension 71.8mm (D) X45.5mm (H)