Thom Hogan reviews 12-35, 15mm F8

I would agree with that review, it is expensive and there is CA, to be honest I had not noted the vignetting barrel distortion and diffraction. I did buy out of necessity and I am not disappointed,  it really is a good lens and at the moment there is no alternative lens.... perhaps Olympus will bring out an SHG f2 14-35??

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Jerry
http://agbr.smugmug.com