Typical set up that I use for doing refraction shots on a wet spectacle lens. I’m shooting around 3: 1 FF magnification. I slide forward on the lens to focus the camera and taking a series of shots for stacking. The flower is for a curved background sandwiched between the table mat and a wine cooler. I use glasses just because they have a nice hydrophobic coating.
Note that the broken images displayed in front (i.e. closer to the camera) of the drop of focus point.