The EFS 15-85mm had shown me I could manage with an F4 lens and the wide zoom range was useful. The RF 24-240mm was tempting but the extra barrel length was less welcome for general use. The RF 24-105 F4 is living up to expectations with some fine shots matching the quality of the 100mm macro but with the extra flexibility of the zoom. The RF 24-105 F2.8's tripod ring is among Canon's best RF implementations. This ring is solidly constructed, and the rotation and lock knob are very smooth. There are no 90° click stops, but small groves on the collar align with a small grove on top of the lens barrel to aid locking in these often-useful positions. Introduction. The Canon EF 24-105mm f/4 USM L IS is a 4.4x standard zoom lens for Canon full format (and APS-C) DSLRs. It's often sold as part of a "kit" with the EOS 5D (II) although you shouldn't mistake this lens with the average el-cheapo kit lenses which are common in the APS-C DSLR world. Let's revisit the RF version of one of Canon's most popular zoom lenses of all time, and fir it onto a 45mp Canon EOS R5. Is it sharp enough for such a deman However, the RF24-105/4L in combination with the R has been a real joy to take with me just about anywhere. It gives a surprising combination of sharpness across the frame, extraordinarily fast AF anywhere (with the help of the R), great contrast and saturation, pleasing bokeh and industry best IS. Performance-wise, the RF 24-105mm f/4L IS USM has very few flaws. It might just be the single most consistent 24-105mm lens on the market. The lens features very good sharpness at f/4 and excellent sharpness at all focal lengths between f/5.6 and f/11. Even in the corners, you’ll capture surprisingly sharp images for a zoom lens of this range. The Canon RF 24-105mm F4 L IS USM will be available for purchase in December 2018 for an estimated retail price of US$1099, and is also available in a kit with the EOS R body. Canon RF 24-105mm f While it's a tad pricey for a zoom lens, the RF 24-105mm f/4L IS USM is a great performer that pairs perfectly with the EOS R. It offers the stabilisation (five stops of it) that the body lacks and the new Control ring is a revelation. wn9txK.