Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 PRO lens review: Pro worthy performer

By Kevin Carter - Thursday November 14 2013

Lens Review
Introduction | Olympus best zoom measured on OM-D E-M5 | Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 PRO lens performance | Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 vs Panasonic LUMIX G X VARIO 12-35mm / F2.8 ASPH | Olympus M.ZUIKO DIGITAL ED 12-40mm F2.8 PRO vs Sigma 17-50mm F2.8 EX DC OS HSM vs Canon EF-S 17-55mm f/2.8 IS USM | Conclusion

Compared to its rival, the Panasonic G X Vario 12-35mm f2.8, the Olympus has similar overall optical quality.

However, where the Panasonic has slightly higher levels of sharpness in the center, certainly at the longer focal lengths, the Olympus has better uniformity across the field at wider apertures, particularly at the shorter focal lengths. 

At the shorter focal lengths, the Olympus is sharper with better uniformity than the Panasonic, particularly at wider apertures.

Uniformity remains good across the field but sharpness falls away at 40mm on the Olympus.