When photographing low light action, one historically had to choose between a moderately wide aperture (f/2.8) in a zoom lens and an ultra-wide aperture (f/1.4 for example) in a prime lens. With the RF 28-70, you can have both a wide aperture and a zoom focal length range. While some prime lenses still have the wide aperture advantage, the RF 28-70 f/2 L lens bridges the divide and, especially from an image quality perspective, is an outstanding option for low light needs including concert photography.
The spot lights happened to be on the singer (Ledger) in this image, allowing a very clean ISO 800 with a shutter speed adequate to stop most of the motion at f/2. Other images were captured at ISO settings as high as 6400 where the 1-stop advantage this zoom lens has over most other zooms makes a considerably bigger difference in image quality.
At concerts, the location of the action is often unpredictable and changing fast and that means focal length changes are required, ideally fitting for a zoom lens. Yes, some prime lenses could have given me another 1-stop lower ISO setting, but I would have minimally needed multiple cameras to cover the same range and often the performers were moving so fast that the shot would have been long gone by the time the cameras were swapped. Shooting wider and cropping later is an option, but lower resolution images are the result.
Also great for fast moving subjects was the R's touch and drag AF. With the left hand adjusting the focal length and the right thumb moving the focus point as needed for ideal framing, the EOS R was an ideal choice.
Every shoot teaches new lessons and here are a few concert photography tips from that night.
First, if photographing with a media pass, know without a doubt which gate you are supposed to enter through and be ready to politely ask for a additional opinions when the first person(s) thinks they know the different gate you are required to enter through. This saves walking half way around a stadium to the shipping and receiving area and waiting for a security guard to make a series of phone calls to figure out what you already knew and send you back to the other side of the stadium. If opting to ignore this advice, strongly consider arriving at least 1 hour early.
Also if photographing with a media pass, make sure that you have a signed copy of that pass (minimally on your phone) with you because the media reps for some reason may not have your name on the list. If offered a label with your name handwritten on it, request a lanyard because your camera strap is going to peel the label off within 10 minutes of your arrival, leaving you without the pass. Minimally attach the label to something that avoids the peel-off risk.
While your media pass may specify where you are supposed to photograph from, the media pass may not have been updated since the 360° stage was implemented. The specified locations may not exist and those working the show may have no clue about the topic or even how to get to the floor from the entrance level. Arrive early enough that if the instructions do not align with reality there is time to figure out where you are permitted to go without negatively impacting the show (it is probably not being performed for you).
Oh, if the tour is promoting a 360° stage, just get a ticket and leave the camera at home. Within seconds, the performer can be a basketball court distance away and even two cameras with complementing zoom lenses are not adequate. Compounding the problem is that you will have backs toward you for at least 270° of the stage.
I'll add these notes to the concert photography tips page.