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Yep, lens mounted. Likely it would still show up more-or-less as a ringed refraction off-camera. And this one is a bit wimpy in output.Is the ring light on the lens? Maybe try it off camera above and to the side? Also possibly shoot it through some diffusion or bounce it.

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Did a "quick-n-dirty" setup to play with:

First shot with wide open aperture (โฑ2.5 +2 for adapter) and available light, DoF at around 15ยฐ from perpendicular is a millimeter or two!

Second one is at โฑ22 with the flash dialed down and no diffusion, six inches from the penny. DoF is not bad.

Both penny images are full frame.

First shot with wide open aperture (โฑ2.5 +2 for adapter) and available light, DoF at around 15ยฐ from perpendicular is a millimeter or two!

Second one is at โฑ22 with the flash dialed down and no diffusion, six inches from the penny. DoF is not bad.

Both penny images are full frame.
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Looks like two different pennies.Amazing how the flash changes the texture of the penny.