The higher quality optics on the f2.8 transmit light more efficiently. Some tests show that the f2.8 actually transmits about 3.2 and the f4 transmits about 5.1. About 1.5 stops difference is noteworthy. The 24-70 weighs about 5 ounces more, has an 82mm vs 77mm filter thread, and has no IS. Canon RF 24-105mm F2.8 L IS USM Z. Canon RF 24-105mm F4.0-7.1 IS STM. Canon RF 24-105mm F4L IS USM. Canon RF 24-240mm F4-6.3 IS USM. Canon RF 24-50mm F4.5-6.3 IS STM. Canon RF 24-70mm F2.8L IS USM. Canon RF 24mm F1.8 Macro IS STM. Canon RF 28-70mm F2L USM. Canon RF 35mm F1.8 IS STM Macro. Canon RF 24-105mm F4-7.1 IS STM Specs. Canon has no shortage of premium, high-cost lenses for its full-frame EOS R camera system, but photographers looking for affordable glass have fewer options The RF 24-70L is the “standard” member of the “trinity” of wide aperture, professional-grade zooms for Canon’s relatively new full frame mirrorless ecosystem built around the RF mount. It’s not by accident that some of the earliest lenses to come in the RF mount were the 24-70mm, the RF 15-35mm F2.8L IS, and the RF 70-200mm F2.8L IS Canon 5D II with Canon 24-105L f/4 @ 105mm. Canon 5D II with Canon 24-105L f/4 @ 105mm - enough bokeh for you? Like I said, it's an extremely versatile lens. Anyone going on holiday with a FF camera without this in their bag is missing a trick. Sure, MTF charts and shooting photos of brick walls will try and convince you that you need the 24 Buy Canon EOS R6 Mark II Mirrorless Camera featuring 24.2MP Full-Frame CMOS Sensor, 4K60 10-Bit Internal Video, C-Log 3, External 6K ProRes RAW Recording, Dual Pixel CMOS AF II, 12 fps Mech. Shutter, 40 fps E. Shutter, Sensor-Shift 5-Axis Image Stabilization, 3.69m-Dot OLED EVF, 3" 1.62m-Dot Vari-Angle Touchscreen LCD, Dual UHS-II Memory Card Slots, Multi-Function Shoe, Wi-Fi and Bluetooth Everyone loves the 24-105mm f/4L IS version I lens. At least it seems that way. This lens has been a significant part of a very high number of amateur, enthusiast and professional kits. It is a great general purpose lens and it was an especially great value when purchased in various full frame DSLR kits. Narrow maximum aperture. Lens hood not included. The Canon EF 24-105mm f/3.5-5.6 IS STM ($599.99) may be a budget lens when compared with the company's line of L lenses that are often paired with The canon RF 24-105mm takes a staggering lead on price as it is half the price of the Canon RF 24-240mm even with the offers and promotions. So, the Canon RF 24-105mm is the distinct winner. Design, Build and Spec. These lenses are built with plastic. The 24-105mm has a very plastic and cheap feel to it. It Is exactly what to expect from the price. Let us know. Buy Canon EOS RP Mirrorless Camera with 24-105mm f/4-7.1 Lens featuring 26.2MP Full-Frame CMOS Sensor, DIGIC 8 Image Processor, UHD 4K and Full HD 1080 Video, 2.36m-Dot OLED Electronic Viewfinder, 3" 1.04m-Dot Vari-Angle Touchscreen LCD, Dual Pixel CMOS AF, 4779 AF Points, ISO 100-40000, Up to 5 fps Shooting, Wi-Fi and Bluetooth Kl3Y.