Zoom Canon RF 100-500mm F4.5-7.1L IS USM

Even without the 1.4 extender this lens is a beast! Looking forward to shooting the Blue Angels next year. Took it out to the harbor to shoot pelicans in flight (offhand) and into my first astrophoto attempt with Jupiter. Thrilled with my results! Really heavy, tough to shoot offhand!

A lot has been written about this lens - and I have yet to see much negative written. Some QC issues on earlier copies and lens elements cracking but nothing of late and a truly awesome lens in my opinion.

I had the old EF 100-400 Mk I and thought it soft over 300mm. No such issues here !! This is one incredibly sharp lens and I have been blown away by it's performance.

Weight is OK.
Speed of focus good.
Sharpness and contrast ... well, awesome !
It is easy to handle and it's macro ability is shown all over the web.
The only downside I see is cost.
I do not use it a huge amount but I am glad I got it over the 600 or 800 lenses. I use it when I shoot birds ... I guess it need a tele converter but ATM i take the picture and crop as with an R5 the IQ is stunning.

I have using for last 6 months. I have uswd it in heavy rain and in very dusty environment and it focused flawlessly with sharp images. Most important is that it is light weight and focusing is accurate in light cloudy day and on sunny day.
Lens stabilization is excellent so one can get sharp hand held photos. Tripod collar is strong and fits snugly.