Christmas Cactus Stamen

This photo was taken during November 2013. The use of the 2x extender and 68mm of extension tubes has given an effective magnification of approximately 3.3
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 6s
Aperture - f11.0
Lens - Canon EF 100mm f2.8 L IS USM Macro plus Canon Extender EF 2x III
Focal Length - 200mm
Kenko 68mm Extension Tubes
ISO - 200