Canon RF 28-70/2.8 IS STM

The 28-70/2.8 stands out for its consistently wide f/2.8 aperture, allowing for better low-light performance and shallow depth of field compared to the 24-105/4.0, which has a smaller f/4.0 aperture throughout its zoom range. While the 24-105 offers a longer focal range from 24mm to 105mm, making it more versatile for various shooting situations, the 28-70 covers a shorter 28mm to 70mm range but with brighter optics. The 28-70 is lighter and has a smaller filter diameter, which may benefit portability and filter costs. Autofocus is driven by a step motor in the 28-70, while the 24-105 uses an ultrasound motor, potentially offering faster and quieter focusing. Both lenses feature image stabilization and are compatible with Canon RF full-frame mounts, ensuring good performance in a variety of scenarios.