Novoflex with 400mm f/5.6 and 640mm f/9 lens-heads is a follow-focus lens. The Novoflex follow-focus system was long regarded as the fastest focusing system for telephoto lenses before the AF system. The Novoflex lenses are optimized for center sharpness. Because of the range of the focusing mount, these noflexar lenses can be used from infinity down to very close-focusing levels. Its near-macro capability also adds greatly to their utility for the wilderness or nature photographer. The noflexar lenses are very long; therefore, close-focusing capability can be achieved at some distance from a dangerous subject or skittish small critter. Combining maximized center sharpness with the fastest telephoto focusing system has regarded Novoflex as the ideal lens for wildlife or nature photography.