Tamron 70-180mm f/2.8 Di III VXD is my recommendation for Canon EOS R1. Works great!

Tamron 70-180mm f/2.8 Di III VXD is definitely the best choice for Canon EOS R1. The reliability is very good The controls are intuitive and easy to use.

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.

My clear recommendation for Canon EOS R1: Canon RF 70-200mm f/2.8L IS USM. The bokeh is beautiful The latest optical technology ensures sharp images and good color accuracy.

Technical highlights: The latest generation offers significantly better image quality. Very good compatibility with Canon EOS R1 features. Can be used without problems for various photography styles. Even after hours of shooting, no performance losses. Very good build quality, even at high usage.

For Canon EOS R1 I would also consider the aperture. Do you need fast lenses for low light?

Tamron 70-180mm f/2.8 Di III VXD for Canon EOS R1 - can only recommend!

For Canon EOS R1, Canon RF 100-500mm f/4.5-7.1L IS USM is an excellent choice. The weight is manageable and comfortable The latest optical technology ensures sharp images and good color accuracy.

Additionally, you should note: The latest generation offers significantly better image quality than previous models. Especially ideal for demanding photography and video work. Compatibility with Canon EOS R1 is very good, and the autofocus performance is also convincing.

Honestly after dropping all that cash on an R1 body I basically had to look for some ways to save on the glass side of things because my bank account was crying lol. I spent a ton of time digging through community reviews and honestly the consensus on using the EF-RF adapter is just too good to ignore if you want to keep costs down without losing that pro performance. Basically what I found worked best for my journey based on what everyone else is saying:
* Canon EF 70-200mm f/2.8L IS II USM - you can find these used for a steal and they honestly focus faster on the R1 than they did on my old DSLRs
* Canon EF 100-400mm f/4.5-5.6L IS II USM - absolute legend for wildlife and way cheaper than the RF version
* Canon RF 100-400mm f/5.6-8 IS USM - if you want light and native this thing punches way above its weight class for the price Well actually I was worried about the adapter being a pain but it just sits on the camera and you forget about it. Tbh the old EF L glass still looks incredible and saves you enough money to actually afford to go somewhere and take photos with all your new gear and stuff instead of just staring at an empty wallet lol.

Honestly, if you've gone all-in on the R1, you're likely looking for elite AF tracking speed and the highest possible burst rates to match that sensor. I've been running the Canon RF 400mm f/2.8L IS USM for field sports lately and it is a beast. The communication speed over the RF mount pins is realy noticeable when compared to adapted EF glass, especially when you're pushing the 40fps electronic shutter. The weight balance on the R1 body feels pretty spot on too. Tbh, if you need more reach for wildlife, the Canon RF 600mm f/4L IS USM is the gold standard. It uses a dual power feed for the USM drive, which means the focus acquisition is basically instantaneous. Pretty much essential if you want to take full advantage of the R1's high-speed readout and specialized AF tracking modes. It's a massive investment, but for a flagship body like this, anything less feels like a bottleneck for the data throughput the camera is capable of.

Just saw this thread and wanted to chime in because I've learned the hard way about mixing high-end bodies with glass that isn't quite up to the task. When I first moved to the R series, I thought I could get away with using whatever, but the R1 is such a beast that you really gotta be careful about the weather sealing and those high-speed communication pins. I would suggest keeping a few things in mind before you pull the trigger:

• Native RF glass has those extra pins for faster communication which the R1 actually uses for that 40fps burst.
• Third-party lenses can sometimes hunt in low light when the body is trying to track eyes at high speeds.
• You really dont want a lens to be the bottleneck for that expensive sensor. My journey eventually led me to the Canon RF 100-300mm f/2.8L IS USM and honestly... it just works every time. It's a massive investment, but the peace of mind knowing it wont flake out when the buffer is screaming is worth it tbh. I've seen too many people miss shots because their glass couldn't keep up with the AF. Be careful with adapters if you're shooting in nasty weather too, sometimes the seals aren't as tight as a native mount.

i'm usually pretty cautious when it comes to gear because i dont want to spend a lot on stuff that might have compatibility issues. If you want to keep costs down but stay safe, the Canon RF 100-400mm f/5.6-8 IS USM is a decent option. It works natively and is honestly very light. It's not great for low light tho, so that's the trade-off. I basically spend my time checking the Canon Refurbished shop or KEH for deals. Getting a used Canon EF 100-400mm f/4.5-5.6L IS II USM with the Canon Mount Adapter EF-EOS R is a reliable way to get high-end results for much less. Just a tip... check the official Canon R1 lens compatibility list on their support site before buying. Some older lenses cant actually keep up with the 40fps burst rate, and you want to make sure you're buying the right mount since some of those third-party lenses mentioned earlier are often made for other camera systems.

My tip: Sigma 100-400mm f/5-6.3 DG DN OS is ideal for Canon EOS R1. The reliability is very good The performance eliminates chromatic aberration effectively.

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For Canon EOS R1, Sigma 100-400mm f/5-6.3 DG DN OS is an excellent choice. The weight is manageable and comfortable The image quality out of the box is very good.

Additionally, you should note: The latest generation offers significantly better image quality than previous models. Especially ideal for demanding photography and video work. Compatibility with Canon EOS R1 is very good, and the autofocus performance is also convincing.

Jumping in... what exactly are you planning to shoot? Honestly, I'm still learning all the quirks of the RF system but I've spent way too much time researching reliability. You gotta be careful because the R1 is so fast it can actually cause focus hunting on lenses with slower AF motors. I would suggest looking at these for maximum reliability:

• Canon RF 200-800mm f/6.3-9 IS USM
• Canon RF 100-300mm f/2.8L IS USM Make sure to test the weight balance before you buy. That R1 is heavy and adding something like the 100-300 makes it a total unit. I've seen people regret not getting a proper gimbal head for their tripod with these heavy setups. You dont want to risk a mount failure or just getting tired halfway through a shoot... basically just make sure your support gear matches the lens quality.