The signa 10-18 and 18-50 would make a pretty darn small travel kit with the xt5. I appreciate you mentioning the diffraction hit after f8 on the 40mp sensor. I think you are the only KZfaq channel that has mentioned that. I have tried not to go smaller than f8 on my XT5 as a result. Thanks again for a great review.

I’ve been waiting for this. Especially appreciate the comparison to the Tamron 11-20. Thanks, Dustin. As an aside, may God bless you and your family.

Dustin, I always love the thoroughly professional way you conduct these reviews; top notch! You mention in the beginning that there are actually only a few lenses that can handle the 40MP sensor. It'd be interesting to hear you "shortlist". Just bought Fuji's 18mm f/1.4 and I must say that the way it resolves on my XT5 is on a different planet!

Great review, very interesting to have testing looking specifically at that 40MP sensor. Thank you!

What a fantastic tiny lens has Sigma made indeed! Another great comprehensive review Dustin!

Another excellent review thank you Dustin. I have previously stated that I waited, for some time for Fujifilm to release a, modestly sized sensor body, however one which also addressed its long-standing below the competition, AF/IAF. I gave up waiting and purchased the S10, only for Fujifilm to release the S20, a month later ( certainly in Australia). I already have the Fuji wide angle zoom and am very pleased with its performance. Also, I am a true Sigma fan. However, as a confirmed non pixel peeper, it would seem to almost be squandering money to effectively, ditch the Fuji wide angle zoom for the clearly excellent- once again- Sigma offering. I will now view your review of the S20 in order to see if it offers sufficiently advanced AF to justify my losing money on the sale of my S10. Tbh, the much stronger battery in the S20 is a very strong attraction, as the OE batteries in my XT20, XT2 and S10 seem to quickly lose power. As usual, another excellent review, and Sigma keep kicking goals.

My philosophy is that one should actually want the sensor to out-resolve the lens and not vice-versa, as otherwise aliasing (yes, even on X-Trans) is always a potential problem. In that regard I don't think there can ever be too many megapixels, at least for the foreseeable future.

I agree with your assessment of the sensor. I love my X-H2, but outside the 200mm f/2, the new 56mm f/1.2, the Viltrox Pro Options, and the 8mm 3.5mm, I haven't found a lens the really shines on this sensor. Forget adapting vintage glass.

you have mentioned couple of lenses that are capable of resolving the demanding sensor - what are those lenses?:)

At 18:00 it almost feels like if we were to zoom the sony photo to the same level as fuji (or upscale in essence) the sony version would still look better. Have you tried upscaling the sony version, or even downscaling the fuji photo to 26 megapixels for comparison? For me it is hard to believe that different mount lenses should perform differently, unless you were unlucky with the sample you got...

I just bought in august the fuji xf 14mm 2.8 used but in pristine condition. I love it But this zoom going even to 10mm is very tempting. Might be the perfect addition to my sigma 18-50mm

Thank you for your work on this comparison. It is obvious you put a lot of time and effort into the comparison and the professional video. However, everyone, and I mean everyone, knows that Lightroom does a sub-par job in demosaicing X-Trans files. I challenge you to either look at both sets of files in Capture One, which does a much better job of converting X-Trans files or demosaic the X-Trans files in DXO PhotoLab to DNG files and then bring them into Lightroom. Every one of my Fujifilm files, no matter which lens is used, are sharper and detail is better resolved when demosaicing in DXO than in Lightroom Classic. If you see a difference, I think you would then be obligated to make a video with your new findings. I don’t think any lens test with Fujifilm X-Trans files using Lightroom is the best way to judge a lens. Long time Fujifilm users, such as myself, know to get the absolute best results, use DXO, Capture One or Iridient Transformer to process Fujifilm raw files.

Hi! This is a very nice and comprehensive review. Thank you for the info! I’m trying to decide whether to get the sigma 10-18mm or the 18-50mm for my Switzerland trip this summer. I already own the fuji 23mm f2, but I want a wider lens for landscape and architecture photos. Which one would you recommend?

Given the amount of in-camera geometry correction that must be done,, especially at the Sigma's 10mm end, I would expect resolution performance to change across the full area of the picture, not only between the corners and the center. And I would expect hits to resolution performance to be more obvious with a 40Mp sensor. For testing camera-corrected resolution performance ideally test charts should cover the entire imaged surface with resolution targets. The worst resolution may not necessarily be in the corners and/or it may vary unevenly across the frame, depending on the amount of geometrical correction being applied. I'd ultimately like to see a full-image "resolution map" at various zoom settings.

Thanks for your work Dustin! 🙏🏼

Thanks for the review! While I shoot on Canon, I wanted to see how this lens does on a high MP camera to estimate how this will do on my R7. Lens looks excellent on 26 MP, but only good on 40 MP. Can't wait to see you test this lens on the 32.5 MP Canon R7 once it is released!

A great review, very much reflecting my own experience. Let's say I've been on a "journey" with my X-T5, and pairing it with this lens in particular! My copy is actually OK to f/11 but completely falls apart above that. At 18mm I've found my Fujifilm 18-55 is sharper than the Sigma. Generally I'm very happy with the Sigma, once you know its limitations. Those limitations are certainly a fair price to pay for the small size and weight of the lens IMO, especially when you're hiking 20 km with it! FWIW, I've found I get the best detail and acuity from the X-T5 sensor by processing in X-Raw Studio and exporting as a Tiff, before taking that into Lightroom. I did a comparison between that, handling the RAW file direct in Lightroom, processing in DXO, and running it through Lightroom's "Enhance". It's a faff to do it, and the resulting Tiff files are big, but I find it's worth it for those images where crisp details are important. BTW, would be interested to know what's on your 40MP shortlist of lenses that you mentioned?

Eurgh, of course I invested in the Tamron the other month 🙄 I did get a good deal and I wanted the weather sealing, but still - that side-by-side is savage! I must say, my limted real world results have been good so far and I don't feel like it's underperforming, but then I'm typically using it stopped down. One review (possibly even yours) also mentioned the presence of some field curvature on the Tamron, which I guess might account for some of the corner performance on the test charts. Hmm, tell me I'm not going to regret waiting for this review before jumping...😆

Nice review as always Dustin. Would love to see a video on the X-mount lenses that can actually resolve the 40mp. I know the Viltrox 27mm does but wonder which others do. Fuji’s list isn’t great. Many on their list don’t actually resolve the 40mp.

Thanks for this very detailed review. I'm currently on the process of selling some wide angle primes to get this all-in-one wide zoom for my Fuji cameras, and was wondering if I would regret it. After this comprehensive review it seems that the Sigma is an excellent performer, I'll use the hell out of this lens! Was also nice to see the AF report on Fuji since most reviews I saw were on Sony. Just as a note: did you try to use the "enhance details" Lightroom feature on the Fujifilm RAW files? (just normal enhance, not super-resolution or denoise) Asking because I think it will increase resolution a lot. X-trans details compare badly to bayer, and the "enhance details" will sort of restore Fuji files detail and color resolution to bayer-like results. I wish that increasing the MP on the new sensors would make Fuji finally ditch that stupid and non-practical X-Trans marketing BS, but sadly not :/

I looked at your review of this lens side by side for X and E mount. It seems that on E mount, it performed way better - especially mid-frame and edges. I am wondering if this is mostly caused by sample variation or maybe Fuji's 40MP is really so demanding that it causes image to actually look better on lower resolution camera body?

Thanks for the review. I wonder how it compare to the Fuji 10-24 f/4 OS.

Great review! Thank you so much!

Just notice that you still haven't reviewed the XF 10-24mm Mk2 yet. Any plans for that?

I’m happy with my 26 MP on my X-S20. The only time I’d want more is wildlife. Chris of Petapixel sounded very negative while reviewing the 10-18 while raving about the 18-50 in the past. I assume in camera corrections are necessary.

Thank you for the comparison with Tamron 11-20. I'm using an X-T5 and decide to choose Sigma 10-18 as my wide lens. :)

Great review 👌 I have these new Fuji 40mp cameras but just out of curiosity how much of a difference do full frame cameras have over these Fuji 40mp cameras in image quality? As I was thinking of adding a full frame to my collection as I own Fuji crop and medium format already

Are you sharing that list of lenses that are best with the high-res Fuji cams? :)

Dustin, if You would use "enhance" tool in LR for superior demosaicing (or DXO PureRAW 3), then Your results with comparison with Sony sensor would be equal. In Your video they are not, because LR by default is doing poor job in demosaicing Fuji X-Trans RAW files😉

Hi Dustin, would you prefer XF8-16 over this? i found a used deal for USD960 the fuji but not sure if it worth the price tag, I'm not using much ND filter however, but nice to have, I'm using XT5 btw.

Hi, thanks for the video:) Does it lose focus when you zoom in/out, especially while recording video ? or have you noticed any light change when you zoom in/out during video shooting ?

I use the Sigma 10-18mm on x-T5 without problems.

Hi, it would be nice to include the Laowa 8-16 in this comparison… thanks a lot for your review!

The diffraction starts at f8 ? It seems that this is true for all lenses on fuji xh2 with 40 mp?

Thank you for this review. This lens seems to be interesting for 40,2 Mpx FujiFilm sensor. Haven't you tried with 40 mpx sensor also older 8-16 Fujinon lens?

When Fuji starts playtesting the X-Pro4 please try one out if you can with the Voigtlaender parallax-adaptive lenses like the VX50mmF1.2 etc. I love the H-series Fujis, but now the S5ii/S1R have taken over that area, so the X-Pro and X100 lines of Fuji retain interest for me.

i wish theyd focus on autofocus & iso. im GOOD with 24mp thats it. Why do they keep doing this...

How is it that that your sharpness result with the tamron is now so bad, as compared to the test of the tamron wich showed excelent result ? I compared your video side by side, and something seems wrong there.

Thanks for the review! Would you mind telling me how bad the vignetting is on an a7 series? If not, no biggy. Thanks!

I want to try 40mpx Fuji, but I shoot videos more than photos, is it ok to choose xh2 not xh2s for video?

I found the Laowa 9mm on the X-T5 is significantly better if you care about sharpness towards the edges. The Sigma is quite good throughout the rest of the range though, and it's very small for what it is.

Hey there, one question. If you had to pick between this lens & the Viltrox 13mm 1.4, which one would you choose? I need a wide angle lens. I already have the Sigma 56mm 1.4 & the Sigma 18 to 50mm 2.8. I like that the Sigma 10 to 18mm is light, small & wider than the Viltrox 13mm. The Viltrox on the other hand is better suited for night shooting because of the 1.4 aperture, it's less expensive, better built, but heavier & bigger. So it comes down to sharpness IMO, I use the Fuji X-S20. Which lens is sharper? Thx

Hi, Dustin. Have tested the xf 16-55 f2.8 on the x-h2 yet?

Sir could you please tell me Which mini tripod you use?

Please retest viltrox 13mm 1.4 on 40mp sensor. It will be interesting to watch.

Hi, thanks for a detailed review and your every effort into it, but I would like to claim that all the images by Tamron 11-20 in this review (18:05 - 19:11) are far poorer than they originally should be. From your own review of Tamron 11-20 paired with the same X-H2 posted on June 19 2023 ( kzfaq.info/get/bejne/Z9udq8yb1dHUZnU.htmlsi=HsjN_hqQeyEESK5l ), all the image quality test samples are far more crispy and contrasty than what we see in the current review. Maybe your Tamron 11-20 gone really bad some time in the last 6 months (optics are out of alignment or AF is consistently malfunctioning) ?? Please check this.

This is literally exactly what I was looking for. Just got a a7rv and have this lens. I was wondering how it would look on a full frame.

Interesting combination, it's a shame that fuji lenses are surpassed by their third party counterparts, but I didn't quite understand the comparison with Sony , I mean , what if you downscale the fuji image to 26 mp or upscale the Sony to 40mp, does still look sharper?

think the 10-18mm F2.8 DC DN will perform better on older fuji sensors (26MP)?

Well, it doesn't look like these Sigma lenses are meant for 40mp apsc, but definitely 24mp and 26mp. Looks like Fuji has really shot itself in the foot, as people up and down in the comments don't seem to have very many Fuji lenses that can resolve the 40mp sensor. Fujifilm really messed up. I mean you either buy a Fuji 24 or 26mp sensored camera and invest in a whole bunch of now obsolete lenses. This Sigma lens is already obsolete on Fuji X-mount as brand new. The rapid decline at the smaller apertures is telling of the airy disk problem and that they're not optimized for 40mp. How you gonna do landscapes with a small aperture and the image being crushed by poor resolution. And the Tamron is even worse. 40mp was much too soon, but Fuji is trying to up the game, make most of its own lens lineup obsolete as "Planned Obsolescence". Looks like 26mp sensor is planned as a short lifecycle sensor.