I am mainly debating between the RF 24-240mm f/4.5-6.3 IS USM, vs RF 24-105mm f/4-7.1 STM + RF 100-400mm f/5.6-8 IS USM. Locally, the price for either kit would be about the same ($900). I generally like the RF 24-240 as a walk-around do-everything lens. The much better and faster focusing is a big advantage over the 24-105 STM.
It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject. Has rounded aperture blades. Canon EF 24-105mm F4L II USM. Canon RF 24-105mm f/4-7.1 IS STM. Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor. (Canon RF 14-35mm f/4L IS USM) The transmission result from the DxOMark set of metrics. Transmission refers to the amount of light that reaches the sensor through all of the glass elements of a lens, with a lower TStop signifying more light. Compare Canon RF 24-105mm f 4-7.1 IS STM Lens vs Canon RF 24-105mm f 4 L IS USM Lens vs Canon RF 24-70mm f 2.8 L IS USM Lens vs Nikon NIKKOR Z 24-70mm f 4 S Lens Press ↵ Enter for Accessibility for blind people who use screen readers
1. Difference in the Acronyms Canon USM Lens The STM is the acronym for Stepper Motor, and USM stands for Ultrasonic Motor. A Canon STM lens use a stepper motor for autofocusing. The Canon USM lens uses an Ultrasonic motor for autofocusing. 2. Noise Factor Canon USM Lens 50mm The USM lenses from Canon produce slight noise during the autofocusing.
The Canon RF 85mm f/2 Macro IS STM is a nice small lens, weighing only 500 grams. It measures 3.1 x 3.6 inches and balances very well when fitted on a Canon mirrorless camera. The low weight is
