fredmiranda.com
Login

Moderated by: Fred Miranda
  New fredmiranda.com Mobile Site
  New Feature: SMS Notification alert
  New Feature: Buy & Sell Watchlist
  

FM Forums | Canon Forum | Join Upload & Sell

  

R6 MkIII Lens Suggestions

  
 
egmont
Offline

Upload & Sell: Off
p.1 #1 · R6 MkIII Lens Suggestions


Welp - yoyo_dealer asked a similar question but I'll post anyway!

I realize this has been beaten to death but here we go anyway.

I’m getting ready to finally replace my 7D with the R6 Mk III (with the adaptor). I’m keeping my EF lenses for at least the time being but would like input on which RF lenses I should be looking at adding over time.

What I shoot – everything, but mainly outdoors – landscapes, wildlife, birds, flowers, pets, etc.
Human beings to a much less extent.

What I have – 24-105 f4 & 17-55 EFS (both of which will stay on the 7D).
50 f1.8 II; EF 100 f2.8 L Macro; EF 70-300 f4-5.6 L

What I am looking at – R6 Mk III w/24-105 f4 L; RF 70-200 f4 L IS USM; used Tamron 15-30 f2.8 G2 (for astrophotography).

Should I be looking for something other than the 70-200? Probably my biggest frustration is not being able to bring birds in close enough BUT, I don’t need something big and heavy or a lens that costs more than I bring home in retirement.

Any suggestions are welcome. Thank you very much!



May 19, 2026 at 03:58 PM
tomba8tomba
Offline

Upload & Sell: Off
p.1 #2 · R6 MkIII Lens Suggestions


I would adapt the EF 24-105 f4L and instead of buying a RF 24-105 f4L + RF 70-200 f4L I would buy the RF 100-500 f4.5-7.1L.


May 19, 2026 at 04:07 PM
garyvot
Offline
• • • • •
Upload & Sell: On
p.1 #3 · R6 MkIII Lens Suggestions


I personally would just adapt what you have unless you have money to burn.

The equivalent RF lenses are only marginally better, if even that, than your current EF lens collection, and all your EF lenses will work better than ever on an R body.

Arguably, if your EF 24-105L is the mark 1 version, then the RF 24-105L might show some improvement, but I would shoot with your lens first to see if you like the results.

Since you are going from crop to full frame, you will lose some reach. If shooting wildlife with your R6 III is important, you will definitely want a longer lens than a 70-200. In keeping with the best bang for the buck, a good condition used EF 100-400L IS II would be ideal. It is, however, not light or compact. Alternatively (or in addition), or you could consider letting go of the 7D in favor of an R7.

If money is not an object, then the aforementioned RF 100-500L is the best all-round choice. It is about a half-pound lighter than the EF !00-400L II and packs more compactly. The extra 100mm on the long end is like having a built-in 1.25x TC.

That said, when dealing with adapters, it is usually easier to stick entirely with EF lenses if you already own several. That way you can keep an adapter permanently mounted to the body, rather than juggling it off or on depending on what lens you are using.



May 19, 2026 at 04:47 PM
osidesurfer
Offline
• •
Upload & Sell: Off
p.1 #4 · R6 MkIII Lens Suggestions


Since this is only your second post in 21 years, I'll try to be helpful. I also upgraded from a 7D and shoot very similar subjects.

I agree with the others that you should adapt your EF lenses, for a while at least. The 24-105mm f/4 and 70-300mm f/3.5-5.6 should be excellent for landscape and the 100mm f/2.8 is excellent for macro. I still use this macro lens.

Your main shortcoming is for wildlife and birds, so I would put your dollars there. Your 7D gave you 17mp. The R6 Mark III will give you 12.7mp in APS-C crop mode, which is important because you will need to crop for birds. The EF 100-400mm ii that was mentioned is a great choice and you can get a good used copy for around $1K. I use this lens for hand help bird photography. In 1.6 crop mode you'll get an effective reach of 640mm, which is decent for bird photography. This lens is also excellent with a 1.4TC iii. Of course, the RF 100-500mm would be the best choice, but at least double the cost. The lower cost solution would be the RF 100-400mm. Again, you'll likely be cropping with all of these lenses unless you only photograph larger birds (e.g., egrets and herons).

Another option to consider would be a used R5 at around $2K in excellent condition. An APS-C crop would give you 17mp, the same as your 7D. The autofocus on the R6 Mark III is likely better, but the R5 is still very good,

It sounds like you would like some RF lenses, and they're good, but I guess it comes down to how important is wildlife and bird photography to you.

Also, I can't see you shooting the 7D after you upgrade. Your new camera will be lighter and better in every way.

Kevin



May 19, 2026 at 07:43 PM
Z250SA
Offline
• • •
Upload & Sell: Off
p.1 #5 · R6 MkIII Lens Suggestions


My friend used his old and proven 70-300L adapted to his R7 for a year when I lured him to get the 100-500. He is overwhelmed, the sharpness, contrast, speed, IS, everything, (when the R7 nails it). The short minimum focus distance is awesome for insects and flowers. A very light and capable lens the 100-500 is.

Yes, the RF 100-400 is very good too. And if you dont have a 100-500 the 100-400 will du very well. But 100-500 is on a different level, the price too.



May 20, 2026 at 02:06 AM
Steve Spencer
Offline
• • • • • • •
Upload & Sell: On
p.1 #6 · R6 MkIII Lens Suggestions


egmont wrote:
Welp - yoyo_dealer asked a similar question but I'll post anyway!

I realize this has been beaten to death but here we go anyway.

I’m getting ready to finally replace my 7D with the R6 Mk III (with the adaptor). I’m keeping my EF lenses for at least the time being but would like input on which RF lenses I should be looking at adding over time.

What I shoot – everything, but mainly outdoors – landscapes, wildlife, birds, flowers, pets, etc.
Human beings to a much less extent.

What I have – 24-105 f4 & 17-55 EFS (both of which will stay on
...Show more

It is hard to asnwer this question without knowing how much you are willing to spend right now and on a continuing basis to upgrade your kit. Personally, I spend about $1,000 a year on photography and that means I have to plan my kit over a five to ten year period to get what I want. It also means I sell some of what I have and use the proceeds to buy what I want.

In your case, you will first have to decide if you want to sell the 7D and at least the 17-55 EFs to get the R6 III (and maybe you would be ok with an R6 II at least at first as it will cost you less money). Other than the 17-55 all your lenses will work just find on the R6 III with the adapter, but personally over time and as you can afford it I would looke to replacing the EF lenses with the RF versions. Some like the 50 f/1.8 would cost you very little, others would cost you more. The only lens without a clear RF replacement is the 70-300 f/4-5.6L, although if you often crop with that lens the RF 100-400 f/5.6-8 will serve much of the same capabilities and it isn't that expensive.

If it were me and shooting what you shoot, here are the lenses I would consider getting:

RF 85 f/2 Macro - this is an inexpensive but really nice lens in my experience. It only goes to .5X for magnification but does really well for macro. If .5X magnification works for you it could replace both your EF 50 f/1.8 and your EF 100 f/2.8L and if you sell those lenses you should get enough to buy this lens. Later you could upgrade to the RF 100 f/2.8L, but personally I like this lens and its faster aperture more, but I don't hardly ever shoot more than .5X magnification.

RF 100-400 f/5.6-8 - this will get some of the reach back from your 70-300 f/4-5.6L that you lost by going to FF. It will actually funcation a lot like the 70-300L in terms of reach and depth of field as that lens on the 7D. You can also get this lens and have a little money left over if you sell the 70-300L. It also is a light and fairly small lens for what it is. If your budget allows updating this lens to the RF 100-500L or the EF 100-400 f/4.5-5.6L II as an intermediatry step would make sense. If you have even a budget of $1,000 a year, then you can update the RF 100-400 to the EF 100-400 f/4.5-5.6L II in one year and in another year update that lens to the RF 100-500L. I think given what you shoot, that you may well want to get to the 100-500L, but you can do that in steps and still have quite a bit of capability.

RF 24-105 f/4L - this is a nice upgrade to the EF version but as others have said it won't be a night and day difference to your EF 24-105 f/4L. The upgrade cost isn't huge, however, so including that in your plans does make sense to me.

RF 16-28 f/2.8 STM - for astro I would go with the Canon RF lens, which I think is a really good lens, over the Tamron EF mount lens. You might start with the Tamron, but the RF lens would be an easy upgrade.

So, in a five year period if you can even spend $1,000 a year you ought to have a kit that looks something like:

Canon R6 MK III, Canon RF 16-28 f/2.8 IS STM, Canon RF 24-105 f/4L, Canon RF 100-500 f/4.5-7.1, Canon RF 85 f/2 (or the Canon RF 100 f/2.8L Macro if you want higher than .5X magnification) and that will be a very strong kit and serve you quite a bit better than your current kit. You will likely still be frustrated by lack of reach for birds, that is a hard problem to fix, but you don't want a big heavy expensive lens and that is the only way to fix that particular problem and you won't encounter it as much if you have the 100-500L.



May 20, 2026 at 07:02 AM
 


Search in Used Dept. 

osidesurfer
Offline
• •
Upload & Sell: Off
p.1 #7 · R6 MkIII Lens Suggestions


Steve Spencer wrote:
RF 85 f/2 Macro - this is an inexpensive but really nice lens in my experience. It only goes to .5X for magnification but does really well for macro. If .5X magnification works for you it could replace both your EF 50 f/1.8 and your EF 100 f/2.8L and if you sell those lenses you should get enough to buy this lens. Later you could upgrade to the RF 100 f/2.8L, but personally I like this lens and its faster aperture more, but I don't hardly ever shoot more than .5X magnification.


I have a few comments on the RF85 f/2 vs EF 100mm f/2.8 since I own both lenses. The RF 85mm f/2 is a good lens, but for macro, I much prefer the EF 100mm f/2.8 for the following reasons:
- You get 1X magnification vs 0.5X with the 85mm
- You can add extension tubes, 12mm and 25mm, to go to 1.37X if needed
- The focus throw is short on the 100mm f/2.8. It's extremely quick and easy to manual focus, which I do most of the time with macro. The focus throw on the 85mm f/2 is very long and if you want to manual focus, most likely you'll need to switch to autofocus to quickly get in the ballpark and then switch to manual focus to fine tune. Once you're in the ballpark, there isn't any issue with manual focus. By the way, with the manual focus assist features on the R camera bodies, you'll really love manual focus with the EVF.
- I tend the use the 85mm when I'm out in a non-macro situation, but it provides macro ability if the situation arises. It's smaller and lighter than the 100mm f/2.8, and it gives you f/2.




May 20, 2026 at 12:49 PM
Z250SA
Offline
• • •
Upload & Sell: Off
p.1 #8 · R6 MkIII Lens Suggestions


When I look back at my Life, 50 yrs as amateur photog as well as a lot of other parts it is quite clear that the worst spendings are the ones on "something that will do til I get The Real One". Ok, there have been financial pain when I decided to get The One straight away, brief pain usually. But sitting on a pile of half-expensive stuff you dont use as you still finally got The One, THAT has cost me much more. And I feel slightly more stupid than was necessary.


May 20, 2026 at 03:37 PM
egmont
Offline

Upload & Sell: Off
p.1 #9 · R6 MkIII Lens Suggestions


To all – thank you for your responses. Most of your answers are what I’ve been considering with a lot of new ideas to ponder.

I’ve had the money for the camera and lenes put back for a long time – I hate to spend money until I know exactly what I want. And then I procrastinate. And drive my wife nuts.

garyvot – pretty much what I was thinking. Everything I read says EF works great with the adaptor. My 24-105 is version 1 which is why I was going to go with the newer RF version. I’ve always liked it as a walk around. I grew up with full frame so the switch back will just make me rethink when I’m shooting with the loss of the crop.

I’ve also considered getting rid of the 7D and adding the R7 with the R6, so I still have the crop. And then, instead of the 70-200, just suck it up and move to the RF 100-500L.

osidesurfer – No, I don’t post. I visit the site almost daily. I’m a reader and a learner, and yes, a lurker. I glean; have learned who to listen to and whom to take with a grain of salt. This has been my go-to site for learning for many years. So, thank you for posting a truly great response!
I have always wanted the EF 100-400 and even rented it once but then we hit mirrorless! It was a great lens and if it works well with a 1.4 teleconverter then that may be exactly the way to go for me over the 100-500.

And I figured that the 7D would collect dust after getting the R6…

Steve Spencer – I honestly don’t have a “budget” per se. I’ve already put back enough for the R6 & lenes. Then I will add as I go, want, and need. I think you’re correct that I need to sell the 7D and the EFS 17-55.

So – maybe I look at NOT adding a new 24-105. Put that money towards either the EF 100-400 OR the RF 100-500. Sell the 7D and 17-55 which will give me a tiny bit towards something else. More to think about!

Thanks very much to everyone!



May 21, 2026 at 08:45 AM
Rivermist
Offline
• • •
Upload & Sell: Off
p.1 #10 · R6 MkIII Lens Suggestions


Regarding lenses, there is still a gap in the RF lenses series, and that is a replacement for the EF 70-300 L, preferably in a more compact format as achieved with the RF 70-200 L f:2.8 and RF 70-200 L f:4. A word of caution about the RF 100-500 suggested by others. I purchased it soon after launch and sold the EF 100-400 it was replacing, offering an extra 100mm reach, more compact because RF allows apertures below 5.6, etc.. But after a couple of years I realized that it was staying home more often than not, due to weight and bulk considerations. I replaced it with the quite competent RF 100-400, not an L lens but the pictures are up to standards, mine at least, and it follows me everywhere thanks to very light weight and smaller bulk. You see in the RF world bigger lenses stick out more than they did in the EF times. The cameras are lighter, most of the lenses replacing EF versions are likewise often lighter or less bulky or add IS, or all of that (compare the RF 10-20mm f:4 L IS to the RF 11-24mm f:4 L, an extreme comparison...). So for me (your mileage may vary) after a few years of RF usage my expectations on lens weight and bulk changed, and bigger / heavier became a liability.
Considering your suggestion to own a mix of full-frame and cropped, RF has some interesting options to own full-frame lenses that work with cropped, case in point the RF 10-20 mm, RF 15-30mm and the new RF 20-50 mm motorized zoom. While bulkier than RF-S equivalents, they allow you to use the lens on both bodies.



Jun 03, 2026 at 10:35 AM
MintMar
Offline
• • •
Upload & Sell: Off
p.1 #11 · R6 MkIII Lens Suggestions


Rivermist wrote:
Regarding lenses, there is still a gap in the RF lenses series, and that is a replacement for the EF 70-300 L, preferably in a more compact format as achieved with the RF 70-200 L f:2.8 and RF 70-200 L f:4.
(snip)


I don't think this is really possible, the lens has to provide 300mm FL and part of it cannot be hidden by the deep mirrorbox. Any and all 300mm ending EF lenses were quite long, with the exception of the DO version with the special optics. That might be the only way to make 70-300 zoom more compact on RF than all the other EF variants (except DO of course, because its body can be ~25mm shorter thanks to the flange distance of the EF mirrorbox).

Edit: Now that I think of it, the sizes of the 70-200Ls on EF were mostly dictated by the ruggedness, internal zooming and focusing aspects of the construction; it's not like there could not be a compact 70-200L for EF too, as there exist several plastic kit EF 80-200 variants, all of them very compact already on EF.




Jun 03, 2026 at 05:13 PM
bman212121
Offline
• •
Upload & Sell: Off
p.1 #12 · R6 MkIII Lens Suggestions


Looking at a comparison the RF 70 - 200 F2.8 and EF 70 - 300L are basically the same size lens. That actually means the RF version is quite a bit shorter because the flange to sensor distance is much shorter on RF. But that makes perfect sense and if you tossed a 1.4x TC on that lens you'd have 280mm F4 on the long end. Make it 300 F4.5 and that's a realistic size that an RF 70 - 300 F4.5 could be made at. (The RF 70 - 200mm + 1.4x TC)

I wouldn't worry about new lenses until you get some time with the new camera system. It's going to take some getting used to, and because you're also transitioning from crop to full frame at the same time it's going to reset everything you used to know to shoot at.


An example: 24mm on your R6III is like having 15mm on your 7D, so it's already going to be wider than anything you've had recently on your crop body. It may be enough to not worry about needing a better astro lens right away.


The R6III has the upgraded 33MP sensor, so it's more like ~13MP if you cropped it to match the 7D. It is around 70% of the resolution of a 7D despite the crop factor. So you're just trading off some resolution for increased light on each pixel and things should still be good even on your 70 - 300mm. 300mm isn't 400mm or 500mm, but when we're talking birds it's not 600mm+ either. For what you want it may be worth considering the 600mm F11 as a cheaper alternative that could fill in that gap when needed. It would be like putting a 2x on your 70 - 300mm but with better image quality.

https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=738&Camera=963&Sample=0&FLI=6&API=0&LensComp=1511&CameraComp=1508&SampleComp=0&FLIComp=0&APIComp=0

Your 70 - 300mm seems to take the EF 1.4x TC okay, which may also be an option. It should focus good enough on your R6III despite the F8 aperture.


One other random though that you'll eventually notice. Because of having IBIS on the camera, this makes the RF package physically longer than anything in EF world. If you had a small carry bag that used to just barely fit your body and lens, you'll be looking for a longer bag because that combo won't fit.



Jun 03, 2026 at 06:29 PM







FM Forums | Canon Forum | Join Upload & Sell

    
 

Welcome back
Log in to your account