COOKE S4/i 15-40mm T2
The 15-40mm CXX T 2 zooms by Cooke Optics is specially designed to maintain the basic features of the S4i prime lenses. The operation with it is easy and keeps both the aperture and the focus position along all the focal range, so there is no need to adjust those parameters while zooming in or out. As for weight and size, is very similar to the S4i primes.
The Cooke S4i 15-40mm T 2 zoom is prepared to cover 35 and super35 sized sensors. As key features it has extra smooth focus, iris and zoom rings with a negligible breathing on focus racks. Last but not least, it has a very interesting close focus distance of just 16,9 cm.