Dual Nano USM powers the Canon RF 24-105mm F2.8 L IS USM Z Lens's AF. This system is fast, quiet (only a light shuffling is heard), internal, and smooth. With the f/2.8 aperture, low-light AF performance is excellent. This lens focuses on strong contrast in light levels too dark to navigate in.
Specifically, the L version - RF 24-105 f/4L. If you have an older body and want to use the lens universally, get the EF 24-105 f/4L II. If the above are still out of price range, look for them used/refurbished. If you are still above price limits, go for the Non-L version of the RF 24-105. And lastly, the original (not II) EF 24-105 f/4L.The Canon EF 24-105/4L IS USM is a very nice lens indeed. On a full frame DSLR it has an ideal focal length range for a single general purpose lens, with applications ranging from landscapes to portraits. It can be used wide open at f4 and still yield very sharp images and with the 3 stops of stabilization which the IS system provides, it'sRe: Canon 24-105 f4 L In reply to Dendan • Sep 3, 2018 I have the 24-105 f4L and used it for years when I was shooting with my “big cameras” , and it was my all -time favorite lens .