Need a refill?

I'm not going to make you guess what this is :)

 

It's my hubby's favourite glass beer mug. I was looking at the glass in the bottom of the mug the other day and thought it would make a great photograph. So I laid it on its side and focused on the bottom of the glass.

 

Taken with MOG Oreston 50mm f1.8 at about f4, with extension tube.

Done