The Zuiko 18-180 is used as Olympus, very well made and surprisingly compact. By 2x Crop the initial focal length is 36 mm. As built for APS-C cameras Sigma, Tamron and how they all hot with small picture equivalent initial focal lengths 27 to 28 mm but significantly more wide. Light output is typical for this class weak. This reduces the area of application of the fair-weather and holiday photography. When "Always top" the Zuiko is therefore only suitable if you do not want to really exploit the potential of its DSLR.