Christmas Cactus Flower

This photo was taken during November 2012.
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 1/13
Aperture - f16.0
Lens - Canon EF 100mm f2.8 Macro USM
Focal Length - 100mm
ISO - 100
Canon 580EX II Flash with 30° Honeycomb Grid and Canon 420EX Flash with Snoot and 25° Grid
Filter - Hoya 58mm HD Circular Polariser
Tripod