jcolwell Online Upload & Sell: On
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It's a very nice lens, and very sharp, but it has a lot of CA in high contrast situations.
At one time, I had a variety of 135's, and so I compared their USAF 1951 resolution and relative CA on a 20D, including: the Vivitar Series 1 135/2.5; Vivitar 135/2.8 CF (close focus, MFD = 1.9'); SMC Takumar 135/2.5; and, Carl Zeiss Jena MC Flektogon 135/3.5. All lenses had resolution slightly above 50 lpmm (a high res benchmark), with (IMO) severe CA for the Zeiss J (worst) and Series 1 (still bad), and acceptable CA for the others.
Incidentally, I also tested the Canon EF 80-200/2.8L at 135mm, at the same time. The 80-200L has higher resolution and lower CA than all of these highly regarded 135's - that's why it's called the Magic Drainpipe.
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