5 blades and nostalgia

(Shouted in a thick Irish accent), "It has a five bladed aperture, not nine, or seven, but five bladed" to quote (loosely) Monty Pythons' The Life of Brian.

 Pen F with 25mm f2.8 original Pen lens at f4.

Pen F with 25mm f2.8 original Pen lens at f4.