Canon R7 Sigma 18-50mm 2.8 DC DN First Impression.

[RickyRed]

Paired with the R7. This tiny lens is pure joy to use. With decent light you can produce quality photos. I turned the control ring to control F-stops. On APSC, you don't want too Push more than 6.3. Yes there a limitation on this lens. No built in IS. No problem with the R7. I wish sigma would have made the wide end 10mm. The R7 gets very noisy in very low light. If you are thinking of buying the little lens. You won't be disappointed. Yes I have the R5 also. Both are a joy to craft pictures. RJ

 

[Philnick]

Got this lens when it came out last summer. I'm so happy with it that I got their 56mm f/1.4 prime when it came out in December and just ordered their 10-18mm f/2.8. All are small and light and the R7's IBIS makes OIS unnecessary - it even lets me hand-hold my EF 200mm f/2.8L II with the EF 1.4 telextender at unbelievably low shutter speeds. My only lens with OIS at this point is the RF 85mm f/2 Macro IS - another gem.

 

[RickyRed]

This lens plus the R7, has given Me so much joy crafting pictures with such ease. I also use a R5 plus 24-105 combo. Love both.but R5 is much heavier beast to tote around, Also you can use the 24-105 F4 on the R7

 

[Philnick]

Just got the Sigma 10-18mm f/2.8 DC DN C RF Fit. (I don't know why, but Canon has never licensed the -S variations of their lens mounts! "DC" in a Sigma's name means it's for APS-C crop sensors. Since it uses the standard RF mount, it won't automatically trigger crop mode on a full-frame R camera.)

This lens gets me the 16mm angle of view my old RF 16mm f/2.8 had on the R6 II, and is a third the weight (and two thirds the length) of the Tokina EF 11-20mm f/2.8 I experimented with last year. Instead, it's about the same size and weight as the Sigma 18-50mm f/2.8 DC DN C RF Fit that lives on my R7.

With their 56mm f/1.4 DC DN C RF Fit (also about the same size) for low light situations, I now have half of their initial offering of RF lenses and have overcome the two major shortcomings of APS-C: low light and narrow angle of view.

The R7's IBIS lets me have small light lenses and a much more portable kit.

One tip about these Sigma RF lenses: they all follow the approach of Canon's smaller RF primes of sharing a ring between Control and Focus modes - but without a switch on the lens or any marking on the lens that it's anything other than a focus ring (that's controlled through the camera's menu). I recommend setting the menus (1) to make such rings act as manual focus rings, (2) turn on "full time manual focus," and be done with it.

 

[Philnick]

I'd like to start a campaign to get DxO to support the Sigma RF lenses. While all six of them are supported on the Sony, Fujifilm and EOS-M cameras, only the 18-50mm is supported on EOS R - and that only after I got Sigma to send them one to test.

Since the R7 and the M6 II (on which they're all supported by DxO) share the same 32.5 mp resolution, I don't see why DxO is dragging its feet on this, other than fear of Canon dominance.

Please submit a request to DxO to support the other Sigmas on the R7 (the 10-18 f/2.8 and the four f/1.4 primes: 16mm, 23mm, 30mm and 56mm) at DxO Supported Cameras.

It's gonna take a lot of requests.

 

[R7Dutch]

I also got the 18-50 2.8 for my canon r7
Nice lense, lightweight combination as well.

One thing though, the lense hood/cao doesn’t lock on the lense, no resistance in final position
So it basically just rotates back easily and falls down.
Anyone else experience this and what could this be?
I looke d at the interior of the cap and noted 3 screws. Maybe I can adjust the play?

Cheers

 

[Philnick]

I also got the 18-50 2.8 for my canon r7
Nice lense, lightweight combination as well.

One thing though, the lense hood/cao doesn’t lock on the lense, no resistance in final position
So it basically just rotates back easily and falls down.
Anyone else experience this and what could this be?
I looke d at the interior of the cap and noted 3 screws. Maybe I can adjust the play?

Cheers

I suspect that you hadn't pushed the hood far enough onto the lens to mate with the locking mechanism before turning it.

 

[R7Dutch]

I suspect that you hadn't pushed the hood far enough onto the lens to mate with the locking mechanism before turning it.

The hood is fully engaged in the locking mechanism, it just doesn’t lock, it just stops hard at the end with no resistance so it just rotates back easily.

 

[R7Dutch]

The hood is fully engaged in the locking mechanism, it just doesn’t lock, it just stops hard at the end with no resistance so it just rotates back easily.

Sorry, my mistake. I just had to put some more pressure to rotate the hood fully 90 degrees and it clicked in . sorted

 

[Woodsy]

I'd like to start a campaign to get DxO to support the Sigma RF lenses. While all six of them are supported on the Sony, Fujifilm and EOS-M cameras, only the 18-50mm is supported on EOS R - and that only after I got Sigma to send them one to test.

Since the R7 and the M6 II (on which they're all supported by DxO) share the same 32.5 mp resolution, I don't see why DxO is dragging its feet on this, other than fear of Canon dominance.

Please submit a request to DxO to support the other Sigmas on the R7 (the 10-18 f/2.8 and the four f/1.4 primes: 16mm, 23mm, 30mm and 56mm) at DxO Supported Cameras.

It's gonna take a lot of requests.

Hi Philnick,

I have been asking DXO about a module for the R7 / Sigma 10-18 DC DN combination, but am having no luck. I raised a request through the proper channel; I asked the support team for a date, but they can't provide one. Frustratingly, I did get a marketing email saying the lens was supported in Pureraw with a module on RF-S, but it seems the R7 is excluded. Have you been given any more info?

 

[Philnick]

You're a bit behind the curve. My lobbying campaign (including asking Sigma to send DxO lenses to test) was successfull. All of the Sigma RF-S lenses released so far are now supported on the R7: the two f/2.8 zooms, the five f/1.4 primes, and even the new f/1.8 17-40mm Art zoom ("Art" is Sigma's answer to Canon's L series - fully weather-sealed, and this lens also zooms by moving optics internally, without extending the barrel).

Fire up your copy of PhotoLab and add your 10-18mm f/2.8 DC DN. If you're waiting to buy DxO, go to the https://www.dxo.com/supported-cameras page, click on Lenses, and then enter Canon as the camera brand, R7 as the model, and Sigma as the lens brand. That will bring up several pages of supported lenses, including all of the current Sigma RF-S lenses, and which are the oldest versions of PhotoLab and PureRAW that support a lens' profile. (PL 7 and PR 3, except that the 18-50 is supported even by PL 6.)

PS Since Canon has never officially licensed their -S mounts (not even EF-S) Sigma calls them "RF Fit" - but DxO and the rest of the world call them RF-S.

PPS While DxO's individual support is terrible, there's a discussion at https://forum.dxo.com/t/dxo-software-new-cameras-lenses-support-30-september-2025-update/11735/972 where there's a staffer named Marie who posts updates about what lenses are expected to be supported how soon and acts as a back-channel to the developers, in addition to the formal "request" link on the supported-cameras page.

 

[Woodsy]

Thank you Phil that is very encouraging! However, I don't see the Sigma 10-18 listed (see my attached screenshot). I'm interested in PureRAW support and am using v3, so that should be ok. But, when I run PR using an image taken with that lens, no module loaded is loaded. DXO support have not been helpful at all, just telling me to raise a request for the camera lens combination. Very frustrating!

• Join to view EXIF data.

 

[Philnick]

Thank you Phil that is very encouraging! However, I don't see the Sigma 10-18 listed (see my attached screenshot). I'm interested in PureRAW support and am using v3, so that should be ok. But, when I run PR using an image taken with that lens, no module loaded is loaded. DXO support have not been helpful at all, just telling me to raise a request for the camera lens combination. Very frustrating!

View attachment 40745

Well, I'm not showing it with that search screen, but looking at my installed modules inside PhotoLab 9, I was able to manually add it a while ago.

Assuming the menu structure for PureRaw is similar to PhotoLab, go to the "DxO Modules" menu, pull it down, and choose "Download Additional DxO Modules." Then select Canon as the brand of camera, select your camera, and hit "Next." Then scroll down the list to the Sigma lenses and look for it. You should see entries for JPG and RAW that you can select and then click "Next" a few times.

Let us know if this works.

 

[Woodsy]

Well, I'm not showing it with that search screen, but looking at my installed modules inside PhotoLab 9, I was able to manually add it a while ago.

Assuming the menu structure for PureRaw is similar to PhotoLab, go to the "DxO Modules" menu, pull it down, and choose "Download Additional DxO Modules." Then select Canon as the brand of camera, select your camera, and hit "Next." Then scroll down the list to the Sigma lenses and look for it. You should see entries for JPG and RAW that you can select and then click "Next" a few times.

Let us know if this works.

Unfortunately modules cannot be added manually to PureRAW 3. The most annoying thing is the apparent conflict between the marketing material that DXO puts out, and the reality of the modules in the software! That and the disconnect between the support team and technical team within DXO. I have asked customer support to just ask the lab if the module is available for PR. Raising the request again, as suggested by Support, is pointless!

 

[Philnick]

I'm glad I stuck with PhotoLab, which is what PureRaw is a subset of. I stopped using Lightroom years ago except to do panorama merges of images I send to it out of PhotoLab. Try going to that discussion forum at DxO I linked to a few posts back and try raising this concern there. @Marie, the staffer there who participates in that forum, might be able to help you out.

 

[Woodsy]

I'm glad I stuck with PhotoLab, which is what PureRaw is a subset of. I stopped using Lightroom years ago except to do panorama merges of images I send to it out of PhotoLab. Try going to that discussion forum at DxO I linked to a few posts back and try raising this concern there. @Marie, the staffer there who participates in that forum, might be able to help you out.

Thank you, I shall do that if I don't get a resolution through my latest request to DXO Customer Support

 

[Woodsy]

Hi Philnick, I think I now understand what's happening. Photolab has the module for the R7 / Sigma 10-18, but no version of PureRAW has it. DXO Tech Support confirmed the two applications have a specific module loaded at different times. I will just wait for PR to be updated - I don't want to move to PL because of my time investment in Affinity; I hope it appears in PR v3 alongside the 18-50. Thanks for your interest in my issue and advice!

 

[Woodsy]

The Canon R7 + Sigma 10-18 f2.8 DC DN is supported on PureRAW v5. So that's my solution - an upgrade, slightly reduced in price thanks to Black Friday!