With a length of 88.8mm and a weight of just 395g, the RF 24-105mm F4-7.1 IS STM is much easier to handle and carry around than usual for a 24-105mm lens. In comparison, the F4 L version is 107mm long and weighs 700g. Full frame 24-105mm lenses are typically large and bulky, and the RF 24-105mm F4-7.1 IS STM is a smaller and lighter alternative. I bought an R with the RF 24-105 L about 3 years ago, and I added the 24-105 RF STM a year ago for ease of carrying. The RF L lens is clearly the best, as it should be, given the price. But there's very little in it between the STM and the EF L - optical performance is remarkably similar - weakest at 24mm, otherwise pretty decent. Ống Kính Canon RF 24-105MM F4 L IS USM. - RF-Mount Lens / định dạng full-frame. - Khẩu độ: f / 4 đến f / 22. - Hệ thống Nano USM AF. - Ổn định hình ảnh quang học. - Vòng điều khiển tùy chỉnh. - Khoảng cách chụp tối thiểu: 0,45m. - Độ phóng đại: 0,24X. - Số lượng lá khẩu 9. Having f/2.8 in stead of f/4.0 at typical portrait focal lengths is huge. It is, and having 105mm instead of 70mm is also a godsend - at least for my needs. If I had the 24-70/2.8 + 70-200/2.8 combo I would indeed still plan on upgrading to the 24-105/2.8 even though there would be overlap, as it would still save on lens changes and/or body swaps. Together with IBIS it allows to shoot 1/4th of a second at 105mm with quite consistently sharp results. - RF has way faster AF. - both IS and AF are much quieter with RF. - EF feels more rigid thanks to its metal body. - EF suffers from the barrel wobble at 24mm. No impact on IQ, it is just the feel. 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 quality of the lens handling and compact size encourage me to take it out more frequently Canon EOS RP, Canon RF 24-105mm f/4L IS at 24mm, hand-held at 1/8 at f/4.5 at Auto ISO 800, Perfectly Clear. bigger. Ocre Walls, New Orleans, Louisiana, February, 2019. Canon EOS RP, Canon RF 24-105mm f/4L IS at 24mm, hand-held at 1/8 at f/4.5 at Auto ISO 1,250, Perfectly Clear. bigger or full-resolution. 00qaU.