Loath..........

.......To Leave

 
These two seeds seem determined to cling to ‘mum’


This was taken using the combined 31mm and 13mm extension tubes.

 
Further, brief information on Extension Tubes  
There are two types of Extension Tubes
1: Has mechanical and electronic couplings and therefore will work with almost all functions of a modern lens. Metering and autofocus is retained. These are often referred to Autofocus extension tubes.
2: Has no mechanical and electronic couplings. They will only work with lenses that have a mechanical aperture ring. With this type, the camera’s light meter will not work, so you have to shoot in manual mode.

For more detailed information click on this link.
To see a photo of extension tubes, click on the above link and scroll down the page until you see a set of three autofocus extension tubes.