Overview with samples
Review
Center and edge sharpness are very high throughout most of the aperture range, although the performance wide-open at f/4 is good rather than excellent and it drops off a little at f/16 due to diffraction.
http://www.photographyblog.com/reviews/olympus_m_zuiko_digital_ed_300mm_f_4_is_pro_review/
M.Zuiko ED 300mm f4.0 IS PRO for $2125
M.Zuiko ED 300mm f4.0 IS PRO (Reconditioned), $2125
http://www.getolympus.com/us/en/outlet/m-zuiko-ed-300mm-f4-0-is-pro-reconditioned.html
EU deal for 2.113 EUR
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