by subtracting 4 When compared to the 35mm f1.4, this lens has a faster autofocus, it has an internal focus, and unlike its predecessor, the "trunk" does not move out. This means that this lens will certainly accumulate less dust, which is an important factor for video recording. Cons: A number of reviewers caution that the older 35/1.4 is the better choice than the new 35mm, since the XF 35mm f/1.4 performs better than the new 35mm at virtually any aperture you'd likely want to use when shooting landscapes.