The Spring Crocus

I thought I would take a break from posting pictures of Birds and turn to my other favourite subject,Macro Photography!
Though the buds have been a little battered,the colours are still outstanding!

Nikon D3 + Tamron 90mm SP AF Di f2.8 lens with Delta Ringflash.Shot at FX Full frame 1/60 sec. f 51 ISO 250. Strange f stop,but that is what the Metadata says?