Asahi/Pentax SMC Takumar 50mm f/1.4 (c.1974) stopped down to f/16. The colors on the glass are caused by light refracting through the various lens coatings. Read about this great lens on the Prairie Rim Images blog at:
http://blog.PrairieRimImages.com/2011/08/old-glass-asahipentax-smc-super-takumar.htmlPlease contact me for licensing of this image or other contract work.
