The Canon camera has a sensor of type APS-C, a smaller version compared to a Full Frame sensor, which means that your experienced Focal length will be multiplied by 1.6x. This lens has focal length: 24-105 mm. Since Canon EOS R7 does not have a Full Frame sensor the experience focal length you will experience will be: 38-168 mm. Do I buy the EF 24-70 f/2.8 and use it on both bodies, or do I buy an EF-S 17-55 2.8 (Sigma 18-35 f/1.8) and the RF 24-105 f/4? I use the 70-200 (with EF to RF adapter) on my main body and a short lens for my second body when shooting sports. On the EOS 5D MkII used for testing, the weight of the EF 24-105mm f/4 balances perfectly. The outer barrel is constructed from high quality textured plastics, which all feel very rigid and sturdy I would only recommend the RF 24-70 if you're a professional shooter. It's heavy and big, especially on the RP (it's more balanced on the larger bodied R6), and its ridiculously expensive. It has fantastic image quality, but Canon really did well with the RF 24-105 f4, and most people can't tell the difference between images created with the two. Total weight. When you are looking at a combination of a camera and a lens you must always consider the total weight. Each product weighs in at: Canon EOS 90D. 701 gram. Canon EF 24-105mm F4 L IS USM. 670 gram. Together they have a total weight of 1371 gram (equal to 3,02 lb). Looking at the specs and measurements, the Canon RF 24-240mm F4-6.3 IS USM Lens vs. Canon EF 28-300mm f/3.5-5.6L IS USM Lens comparison shows the huge size and weight differences with the EF lens weighing more than twice as much as the RF lens. Being a professional-grade L-series lens, the 28-300 is expected to have stronger build quality. Sigma 24-105mm f/4 DG OS HSM Lens - Canon EF Mount. SKU code: 25323. Compatible with Full Frame and APS-C Cameras. Thermally Stable Composite Construction. Rugged Brass Mount. Optical Image Stabiliser. Hyper Sonic Motor Autofocusing. Razor Sharp Optical Performance. Super Multi-layer Coating. The Bokeh is very good for travel and simple portrait shots. It is not comparable to an RF 85mm f/1.2 L prime lens, but it got me some sharp portraits with a decent background blur. Here are some shots at 35mm at f/4 and f/2.8 from the RF 24-70mm f/2.8L IS US vs the f/4 on the EF 24-70mm f/4 L IS USM. Rattray Head Comparison 35mm EF 24-70 at f4. E5aaY.