I do not normally buy new lenses for my cameras. I mostly purchase them used via ebay. I got a good deal on MP-E 65mm f2.8 and it is incredible.
Here is a 100 piso with my hand as a point of reference.
Now here’s a shot of his left eye and a grain of rice on the blue seal to the right.
That 100 Peso bill is a collector’s item, issued to commemorate the centennial year for my alma mater. The serial number is my birthday. It’s probably worth as much as your MPE lens. Next time, please wear gloves when you handle it.