Mamiya Sekor 135mm F2.8:

Another great lens from a renowned manufacturer. It has great colour rendition and it is really sharp wide open. And it's metal all-round, built to last a lifetime. Chroma is non-existent, even wide open. 

They are very rare now with resultant high prices. 

Sample Photos:

Click on image for larger size.

F2.8 1/200th	F5.6 1/160th	F8 1/30th
F2.8 1/100th on 27mm macro extension tube	F5.6 1/50th on 27mm macro extension tube	F8 1/40th on 27mm macro extension tube