For Canon EOS R6 I would also consider the aperture. Do you need fast lenses for low light?

Have you thought about the brand? For Canon EOS R6 different brands have advantages.

Canon RF 24-240mm f/4-6.3 IS USM is definitely the best choice for Canon EOS R6. The weight is manageable and comfortable The image quality out of the box is very good.

Why this lens? The image quality convinces in all tests - both for photography and for video. Unbeatable for the price, can only recommend. Have already done several projects with it, always satisfied. Also more than sufficient for demanding tasks.

Switched to Canon RF 24-240mm f/4-6.3 IS USM several months ago and am thrilled. The color rendition is impressive The latest optical technology ensures sharp images and good color accuracy.

My tip: Tamron 28-75mm f/2.8 Di III VXD G2 for Canon EOS R6. Very satisfied with it.

Adding my two cents... honestly, I have spent way too much money trying to find the perfect setup, but for the R6, I keep going back to the Canon RF 24-105mm f/4L IS USM. It is basically the ultimate travel lens because it handles everything from landscapes to portraits without needing a lens change every five minutes. The constant f/4 is a lifesaver in museums or churches where you cant use a flash. If you want to go super light and cheap, check out the Canon RF 24-105mm f/4-7.1 IS STM. It is much smaller and way more affordable, though you lose some low light performance at the long end. Personally, I think the L glass is worth the extra weight if you care about edge-to-edge sharpness. Also, throwing a Canon RF 50mm f/1.8 STM in your bag is a no-brainer since it takes up zero space and is great for dinner shots or night walks.

Just saw this thread and wanted to jump in with a practical warning. Honestly, after traveling with the R6 for a year, my biggest piece of advice is to avoid the trap of prioritizing focal range over ergonomics. One massive mistake I see people make is buying a lens that technically covers every range but ends up being so front-heavy that the R6 feels unbalanced without a battery grip. If you are hiking all day, that center of gravity shift really kills your wrists lol. Also, be super careful about lens changes if ur going somewhere like a desert or a beach. The R6 sensor is a total magnet for dust when you swap glass in the wind, and even with the shutter curtain closed, it is still a risk. Tbh, basically every high-ratio zoom suffers from some pretty nasty diffraction at the long end and barrel distortion at the wide end that software correction cant always fix without losing resolution. A few things to watch out for:

• check the weather sealing gaskets because not all mounts are built to the same industry standards
• watch out for zoom creep on cheaper barrels when the lens is pointed down
• dont forget that heavy glass might require a more robust travel tripod than ur used to carrying Basically just make sure you arent sacrificing the actual travel experience for theoretical image quality that you might not even notice on a screen.

Can vouch for this

For Canon EOS R6 I would also check the autofocus performance. Do you need fast AF for action shots?