Sigma 56mm f/1.4 DC DN 'C' on Canon RF (EOS R7) lens review

[@christopherfrost]

Apologies for the re-upload, there was an error in the original.

[@funtaril]

(context: in previous versions of these two videos CF mistakenly called 56mm lens one of the weaker lenses in Sigmas Contemporary lineup, instead of 30mm one)

[@yukonchris]

I have the Micro 4/3rds version of this lens, which I purchased a number of years ago when Sigma was still building lenses for that mount. I have found it to be a compact, light lens with superb optical performance from wide open at f/1.4. I do wish that Sigma had opted to continue with its m43rds lineup.

[@POVwithRC]

Welcome to the club, RF-S. Great lineup from Sigma that we've all been enjoying for a while now!

[@AshBashVids]

It really does seem your R7 has some weird issue with the sensor? I noticed in a decent chunk of your reviews that use it, that lenses suddenly seem decentered or less in focus in the center / corners on the R7 but fine on other cameras like the R5. I particularly noticed this with your RF 28-70mm review as it exhibited exactly what I suspected - something I can't replicate myself with the same lens on my R10, despite the resolution not being too far off (24mp). I know APS-C can make it tough for lenses in terms of resolving power, but I don't think it can affect quality to *such* a degree were it can look visibly out of focus in either the corners or center.

[@goldfries]

Interesting, I can vaguely remember having this thought as well on one of the reviews before. Like full frame lens on APSC body, the APSC sensor would have been covered only by a much smaller area that a FF lens provides and shouldn't be having those shortcomings at the corners. I mean after all, that's part of the reason why people like APSC, the sensor is limited to the lens' best IQ area.

[@megadjc192]

The main issue here is that the canon aps-c 32.5mp sensor simply has a vastly smaller pixel pitch than its full frame counterparts. A full frame equivalent sensor would be over 80mp to have the same resolving power. A 24mp aps-c sensor would have the equivalent of 61mp full frame (Both on Canon with a 1.6 crop). That's over 20mp more FF equivalent detail that has to be resolved somehow! So most lenses will get chewed up by this. Even with the "sweet spot" effect in play, it's simply not enough to compensate for this. Also, for aps-c only lenses vignetting occurs due to the image circle not being the same as a full frame sensor. Also, diffraction limits do kick in quite hard and fast. I owned these lenses and used them with the m6 mark ii. The tests basically come out the same on the r7 as they do on that camera. Also, keep in mind that you cannot compare the resolving power with a 24mp camera sensor from sony or fuji as they have a different crop factor along with the fact that the field of view isn't the same if you crop down to 1:1 on the pixel front. Hopefully that answers some of your questions. These effects are hard and fast and are why you will likely never see super high mp cameras on anything other than medium format. The lenses wouldn't be able to give you resolving power to make that extra pixel bump worth it. It's why you rarely see anything over 60mp on full frame. It's at the practical limit for cost vs performance of lenses.

[@Vinizuca]

Having an R7 myself I will say that Chris is too gentle with the lenses. It seems on my photos that the R7 is even more brutal and destroy lenses even more mercilessly. I had to sell most of my lenses, as practically none could resolve even stopped down.

[@goldfries]

@@megadjc192 thank you.

[@goldfries]

@@Vinizuca thank you.

[@stevewhiteley9249]

Thanks for the review of this and the other one they just released. I can’t really see the point of fast primes if they are not sharp wide open. I don’t think I’ll bother. Shame as I’ve been quite happy with the Sigma 18-50 lens on my R7.

[@flygonex10]

I really like how you do not include your Patreon section in the video for new lenses that are almost the same with just a different mount, or comparison videos.

[@micahaka]

Please review the Voigtlander ultra wides! The 10mm/12mm/15mm

[@noblegendforever2052]

should the title said " RF-S" instead of RF? this is apsc len right?

[@businesscentral2388]

this is impressive 🔥

[@atselykovskiy]

Do you switch off IBIS?

[@Dolancillo]

i guess you need to test with another r7. only to see if your sensor is damaged or not :)

[@Duckstalker1340]

How is this lens compared to the RF 50mm 1.8 on the R7 body? If I already have the 50mm 1.8, should I buy this one?

[@bruck177]

Great question! Haven’t found an answer yet. The extra 6mm and 2/3 stop of light should improve bokeh & ISO a fair amount.

[@TomRucero]

No, buy a different focal length instead.

[@ramous5182]

Kind of tempted to sell my chonky Sigma 50mm f1.4 Art EF and buy this instead. How do they compare in image quality? (Although I have to admit, that huge lens makes me feel like a professional fotographer :)

[@NoxCast]

the 50mm art is known as one of the sharpest lenses ever I'd keep it if i were u

[@justinburley8659]

@@NoxCast Doesn't that lens have a focusing problem right out the gate? Every review that I see says that it needs to be recalibrated, and I'd rather not do that.

[@EricRoseBahamas]

This lens looks like it has better image quality than the 30mm. First 😊

[@hoatd1993]

The quality is not "a little soft" at all.

[@AlirezaZabanavar]

In my opinion, the old Sigma 18-35 and 50-100 lenses still have better sharpness than the new Sigma lenses on the Canon R7.

[@vasiliychernomorov1115]

This 56 f1.4 is one of the sharpest lenses at my EOS M6 Mark II with the same 32megapixel sensor as R7. I don't know how they ruined it moving to RF. It should be crystal sharp

[@christopherfrost]

According to my tests the image quality was the same (I also tested that lens on EF-M)

[@35Truck1]

Crystal Pepsi….💰

[@opalyankaBG]

Doesn't look that good at the widest apertures. On 26 mp the lens is very sharp even wide open, no need to stop it down at all.

[@megadjc192]

26mp on apsc is very different to 32.5mp. The 26mp sensor would be equivalent to 58mp on full frame while 32.5mp would be over 80mp. That difference is huge. Diffraction and pixel pitch matter a lot. This result is the same as it was on the M6 Mark II. Just as another piece of information, Sony sensors aren't as dense on aps-c as their canon counterparts due to sony having a 1.5:1 crop and Canon having 1.6:1. So you couldn't even compare a Sony sensor of the same mp to a Canon one directly based on that spec alone. Hopefully that clears some stuff up.

[@opalyankaBG]

@@megadjc192 The APS-C 26mp sensor actually has the same density as FF 61 mp sensor. How did you calculate what 32.5 mp crop would be on FF?

[@shadyninja1]

How does it compare to the same lens for the canon EF-M M-Mount version.

[@ritrattoaziendale]

It's exactly the same lens

[@3vijaya8]

I had the same question. I vastly enjoyed this lens on M6ii and I am considering getting one for R7. Watching the EF-M video makes me think that the centre image is softer with more fringing on R7 but the corner image on R7 has less fringing??? May be my internet is too slow to show the video properly? I am going to get this anyway. Sharpness is not everything to me and I don't know why but I preferred Sigma 56 1.4 over Canon 50 1.8 with EF-M even not counting the 1.4 advantage. Anyone with real experience?

[@drchtct]

I almost didn't recognize the lens, wow. The Canon mount is so huge, it defeats the entire purpose of APSC sensors

[@airb1976]

Don't see your point. How is the mount related to apsc sensor? Nikon's mount is even bigger, so what?

[@goldfries]

So how is the mount relevant to the sensor? The mount fits FF sensor and APSC sensor, and the mount works for both RF and RF-S type lenses, it's all good.

[@totallynotmyeggalt6216]

unless they were somehow able to use the X mount this would make their APS-C line even more obsolete than it already is (since they wouldn't take full-frame RF lenses)

[@cooloox]

Weird statement. The lens is still tiny, it just widens at the mount.