Fstoppers Reviews the Canon RF100-500mm Lens: My Initial Impressions Are Outstanding

Fstoppers Reviews the Canon RF100-500mm Lens: My Initial Impressions Are Outstanding

Canon has been very busy in the last few years playing catchup in the mirrorless game. Along with a number of new bodies, Canon has also released a bunch of new lenses, including the brilliant RF100-500mm f/4.5-7.1L lens. I've had it for a couple of months now, and here are some of my initial thoughts, along with various images I've taken.

The most difficult thing when you transition to a new system is working out what to do with all your old gear. Do you keep it? Do you sell it? Do you adapt it or do you just give it to your kids? When I made the decision to move from Canon's DSLRs to its new mirrorless system via the Canon EOS R5, I also knew that in order to reap the full benefits of the camera, I'd need to invest in some RF lenses, too. For the work that I do, one of those lenses was the RF 100-500mm f/4.5-7.1L lens. It's certainly not cheap at $2,699, but it's not extraordinarily expensive, either. And having used it in a variety of situations now for a couple of months, I think it's worth every last cent. That's what I want to elaborate on today, but in the interest of fairness, I'll start with a couple of things I don't like.

First, The Cons

Actually, there are only two things I think could be better, and they're directly related to each other. The first is that there's no locking mechanism on the lens. This is ironic, for me at least, because one of the things I first noticed and loved on the new RF24-105mm was a locking feature, which was missing on my old EF mount lens. The problem with no locking function leads to my second issue: lens creep. Because it's such a large lens with a zoom range from 100-500mm, that lens creep begins as soon as you've attached the lens to the body.

Granted, you're not going to be ambling casually around the city for a day with this giant lens hanging off your body, but even so, the lens creep is noticeable and makes for a rather cumbersome movement, especially if, like me, you do a lot of work around the water and on rocks, where you need to climb around a lot. I'm not quite sure why Canon can't add a simple lock feature, because all of my Tamrons, including the 150-600mm, have such a locking feature, which you can see in the image below. 

Weight and Handling

Staying with the Tamron 150-600mm, I have to say that it is incredible how much lighter the Canon EOS R5 and RF 100-500mm lens combination is compared with the Canon 5D Mark IV and Tamron 150-600mm setup I'd been using before I made the switch. Indeed, according to the spec sheets, the EOS R5 paired with the RF 100-500mm lens is about a full kilogram lighter. That pairing comes in at about 2 kgs, while the pairing of the 5D Mark IV and the Tamron 150-600mm comes at a tick under 3 kgs. Having used both setups extensively, it is extraordinary how much lighter and easier to manage the RF100-500mm is. Yes, I'm fully aware that the Tamron extends a full 100mm farther to 600mm, but even so, a whole kilogram lighter is incredible. And I have a much more user-friendly out in the field. Here are some images of the two setups side by side.

This is both setups at 150mm. As you can see, the RF 100-500mm on the EOS R5 is slightly shorter, but not by a whole lot. However, when you start zooming to longer focal lengths, the difference becomes more pronounced. The image below is both lenses at 500mm. 

This is the same comparison from a different angle. From this angle, you can see that the RF 100-500mm is significantly more compact than the Tamron when they're both at 500mm.

For all intents and purposes, neither are modestly sized lenses ,and whenever you pull either out, you're rather conspicuous, particularly so with the white RF 100-500mm. But what I have really noticed is the difference in weight, as opposed to the difference in length, so much so that I haven't used a tripod with the RF 100-500mm lens yet. In two months of constant shooting in all sorts of scenarios, I have yet to attach the EOS R5 and the RF 100-500mm lens to a tripod. Just writing that sounds unbelievable to me when I consider that in the years I owned and used the Tamron 150-600mm with either the 5D Mark IV or the 7D Mark II, I never used it handheld once. Speaking only for myself, I simply couldn't, as it was too big, heavy, and bulky to deal with, especially when I stood on rock ledges for hours on end.

Example Images

So, now that I've established that the RF 100-500mm is lighter and far easier to deal with out in the field, what about the images it produces? Personally, I can't speak highly enough of this lens, for a variety of reasons. But let me show you some images, and they can do the talking.

For this image, I waited patiently because lots of kids use this road to go to a nearby school over the back of the mountains. At mid-afternoon, there are always some gorgeous silhouettes as the sun begins to set. I shot this at 160mm, and the lens captured the boy on the bike and the gradations behind him beautifully. Also, there was absolutely no hint of any chromatic aberration at the top of the frame where the mountains met the sky. 

This shot was taken at 200mm. I hadn't actually planned on getting this shot, as I was down the coast for a different assignment, but I saw this tourist boat leaving the port as I drove along the coastal road, so I quickly pulled over and grabbed my gear. This was shot handheld in Servo mode, and the automatic focus combined with image stabilization made it so simple to get shot after shot that I could use. It was more about getting the right composition rather than worrying about camera setup or focus issues, which is what you want, ultimately.

This next shot below was taken from a position a few yards away. It was shot at 400mm, handheld.

One great thing I've found so far using the EOS R5 in combination with the RF 100-500mm lens is that you really don't need to do much editing at all, especially with regards to sharpening. I try to keep editing times as short as possible whenever I can, but if you have a paying client, you still need to scan the frame with a critical, fine-toothed comb to find any imperfections. Thus far at least, I haven't had to make too many edits at all on account of the image quality straight out of camera. The image below was shot handheld at 150mm.

These next two images show you the range and image quality you can get with the RF 100-500mm lens. Except for converting from raw to JPEG, I haven't done any post-processing at all. The first image of the three workers up on the mountain was shot at 100mm. 

This next shot was taken at 500mm. What's most incredible is that if you zoom in to 100% and beyond, you can actually read the numbers on the black piping. Reading the Japanese characters on the man's helmet is easy.

Added Versatility

Starting at 100mm, the RF 100-500mm lens is still wide enough to do some landscape photography. Of course, it's not going to be your default lens for landscape photography, but if the scene permits and might benefit from compressing the elements, then this lens can work beautifully in a landscape setting. However, one of the biggest bonus features is that the lens front filter size is 77mm. Before I made the transition to a mirrorless setup, I made a habit of buying lenses with a 77mm filter size so that I could use all my filters on them and not have to buy a bunch of different filters for different lenses. However, I could never use any of those filters on my Tamron 150-600mm lens, as its filter thread is 95mm. In switching to the EOS R5, I opted for the RF 24-105mm lens to accompany it initially based partly on its 77mm front filter size, and as a bonus, I found out that the RF 100-500mm also has a 77mm front filter size. That opens up a world of opportunities, especially if you're working in settings that allow for long exposure photography. Here's an example shot at 100mm, with the Lee Filters 10 stop Big Stopper attached.

Summing Up

When I made the decision to switch to a mirrorless system, I also had to weigh which lenses I'd need for my circumstances. The RF 100-500mm f/4.5-7.1L IS USM lens ticked every box on the spec sheet, but that doesn't always mean you're guaranteed success. However, now that I've had the lens for a couple of months, I think it's my favorite lens without a doubt. It's light, you can use it handheld for hours if you need to in a variety of settings, the image stabilization and image quality are superb, and its 77mm filter size is just cream on top. It's also compatible with the RF 1.4x extender and the 2x extender if you need added reach. Aside from the missing lock feature and the lens creep that leads to it, I really can't find any fault with this lens at all. It's expensive, no doubt, but if you have the money and you're on the fence, I wouldn't hesitate to recommend it.

What are your thoughts? I'd love to hear from you in the comments below.

Iain Stanley's picture

Iain Stanley is an Associate Professor teaching photography and composition in Japan. Fstoppers is where he writes about photography, but he's also a 5x Top Writer on Medium, where he writes about his expat (mis)adventures in Japan and other things not related to photography. To view his writing, click the link above.

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You can lock it by twisting the tension ring on the lens barrel, it’s just like the old EF 100-400 IS II.

Yes, you’re right. I had been testing between “smooth” and “tight” depending on scenarios but never actually went the full distance on the ring either way. Thus, the lens creep issue. Just tried it again and there’s a definite “click” you can hear. Granted, I just tried it at home so the lock/hold seems pretty secure in this setting. I’ll have to test it out more when I’m rock hopping out by the ocean. Thanks!


Thank you SO MUCH for creating original content and writing this yourself. This is so much better than just linking to something somebody else did on some other site. Your efforts are appreciated!

Thanks Tom. I think many Fstoppers writers would love to do only originals all the time but it’s also good to introduce ideas from others out there in the world of photography who aren’t part of the Fstoppers team. I much prefer writing originals like this but they take a lot more time, too. I can’t speak for all Fstoppers writers but for me, I have 2 young daughters so sometimes it’s hard. But we always want to continue providing new content on the site, thus the place for videos etc. Thanks, though

Whilst I'm no fan of Canon's EOS R mirrorless camera line, I am a huge fan of their RF lens', and this one is no exception... I've seen the reviews on this glass, and it really is quite something!

Canon has definitely hit the ground running (for the most part) with their new RF lens lineup, much better than they did when they transitioned from the FD to EF mount back in the late 80's IMHO.

Yes I agree. While this lens isn’t cheap at $2,700, it’s not at the nosebleed end of prices either. I think if you do paid work with this lens it will easily pay itself off rather quickly due to its quality. Or if you have some spare money put away and you’re looking for a lens in this focal range, then you absolutely can’t go wrong with this.

As said already you can tighten the lens with the "Zoom touch adjustment ring" which works perfectly well on the 100-400 so should be fine on this lens and is a much better design than a locking switch. I think perhaps Iain you didn't realise what that was for doing your review. The other thing to point out is that it is compatible with the extenders but only after 300mm. It won't allow them attach below the setting of 300mm or allow you zoom less than 300mm.

Yes you’re right about the extenders. I have the 2x extender and it doesn’t work until the lens is extended to 300mm, as you said. On the 600mm and 800mm lenses that’s a non-issue of course, as they’re fixed-length primes. Thanks for pointing that out

I'd say it's no super lens and a bit over priced. $1900-2000 would be about right. Just don't expect miracles and you'll like it just fine. I'm not going to claim it's better than the 100-400. I'd say they're about equal. I do like shooting bugs with it and birds are easy to spot. I also like that you can push/pull if you want to. Haven't tried the 1.4x yet but that should arrive this week.

I don’t have the 1.4x but I do have the 2x. Has worked seamlessly thus far, notwithstanding stopping down so much. The 800mm f/11 prime stops down to f/22 with the 2x extender but the 100-500mm is a lot more flexible. Even more so with the 1.4x

Yea. I was bit torn between the 2x and 1.4. Just couldn't do it. 700mm at f/10 should work just fine. We shot all day yesterday with the R6 100-500 and 80D 100-400 set to f/11 with auto-iso on the 80D for all shots. No wild iso swings on the 80D and we set the R6 iso and shutter by hand. Similar results for both. Normally we shoot 7.1 on the 100-400mm and 300mm while dialing in iso and shutter speed so 7.1 at 500mm is just par for our course and f/10 at 700mm should work just fine.

Sounds like you’ve got it wired. The R6 looks like a steal at its price for what you get

Have to agree. I'm happy with the R6. It's great for using a wide angle catching a kitten ziging and zaging at 2 feet. Never had a Canon that nailed it every time. Very impressed.

That’s exactly what I find with the R5, too. Not so much that the IQ is more dazzlingly spectacular than the 5D4, for example, just the accuracy and hit rate consistency is phenomenal. IQ is amazing, but that’s to be expected. It’s the AF I’ve been most impressed with so far