Has a metal mount. Canon EF 24-105mm F/3.5-5.6 IS STM. Canon RF 24-105mm f/4L IS USM. A metal mount is generally superior to a plastic mount as it is more durable. weight. 525g. 700g. We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes
Corner performance, even wide open looks extremely good for a 10mm focal length. Stopped down it's obviously even better. Vignetting at 10mm also seems to be very well controlled. The MTF charts for the RF 10-20mm f/4L IS STM is exceptional, and it looks like that has translated to the real world as well. As the RF follow-up to the Canon EF 11