Sigma 583306 17-50mm f2.8 EX DC HSM Optical Stabilised lens for Nikon Digital SLR Cameras with APS-C Sensors

I have been using this lens non-stop for the past 3 years for both photography and film making and I have to say for the price and performance it’s one of the best lenses to use for an APC-S camera body. I was so confident in my initial choice of the lens I bought two, which I use for different functions and it satisfied my needs during those times. Just so you are aware I use a D5500 body along with it, which is known for having 1.5 x crop factor. With that in mind here are the pros and cons. PROs: - It’s versatile as an all-round photography lens. The 17-50mm on APC-S is the focal equivalent to a 24-70 on a full frame camera. At 17mm It is awesome for landscapes/wide angle shots, whilst the 50 mm will behave quite like a 70mm prime for portraits. - Uses a 77mm thread for filter which is common for most fixed aperture lenses - Between the 35-50mm range the lens offers great bokeh for portraits. - Having a fixed f/2.8 aperture is brilliant for low light photography and filmmaking and it feels like you have multiple prime lens. It allows plenty of light onto the camera sensor to keep the ISO & shutter speed at low values. - The auto focus is fast and silent on the D5500 at all focal lengths, and the optical stabilisation is great for capturing sharp images that are stationary or moving. 6. Focusing is pretty accurate on wide to medium shots and is useful for manually focussing at infinity if landscape photos are your niche. 7. The addition of a lock mode is great to eliminate any breathing when in use or aiming down. 8. At f/4-5.6 the images and video produced is super sharp, which is where you should be working from most of the time. CONs: 1. The lens is a lot heavier and bulkier than other kit lens to compensate for the fixed aperture. 2. The build quality takes a hit due to price reducing. Some people might like the finish others won’t. 3. You can feel and hear the internal components move around if you shake the lens and the supplied lens hood can easily fall off. 4. The zoom and focus rings are arranged opposite to normal NIKON lens, which can be jarring to new users. 5. The manual focus range is extremely limited especially in close up shots, so be aware of the minimum distance you can rack focus to whether in manual or auto. 6. At f/2.8 on all focal lengths you can notice the image sharpness gets a bit soft and there is a subtle vignette at the lower focal length range. 7. The focal length zoom is an external rather than internally function which isn’t great for filming unless the camera is station at all times. Considering most people who are looking at this len probably are starting out with either/both the 18-55 Nikon kit lens and Tamron 70-300 VC, this of course is the natural progression to advancing your photography. Along with the NIKON 35 mm and 50mm prime lens this would be among my go to lens if I started again from scratch. As a film maker or vlogger, I will admit it might not tick all the boxes and that’s in part due to the negatives addressed. If you really are on a tight budget by all means go for it, but if you’re going to do it professionally I’d often recommend saving the money and getting the sigma art 18-35mm f1.8 and future proof the investment. Regardless of the negatives I still love this lens as it is overall a good purchase, it’s ideal for travel being an all-around lens and can produce truly stunning images with minor issue being fixable in post. I absolutely would recommend this.

I wanted a zoom lens to replace the 18-55 kit lens on my Nikon D5100. I also have the Nikon 35mm 1.8g, but in practice I tended to use the zoom lens more despite the lower image quality. I was looking for great image quality and sharpness with effective stabilisation. The wide constant aperture was a bonus rather than a necessity. This lens was recommended to me by a wedding photographer who chose it instead of a mega-expensive Nikon. I chewed over this for ages - I considered Tamron equivalent both without VC (cheap) and with (not as cheap but not as good?), also the bargain Nikon 50mm 1.8 for image quality. The Sigma is very expensive in absolute terms for an enthusiast like me, but in the end the reviews swayed me. I had some reservations about what I had heard regarding variations between samples, but I decided that I would test the lens extensively on arrival. If there were any shortcomings I would simply use Amazon's excellent return system until I found a good one. After the 30 day mark there would be Sigma's 3 year guarantee to fall back on. I am pleased to report that this has not been necessary - it's a good 'un. The lens arrived in great condition - it is solid and heavy and feels like a professional item should. In use the weight helps dampen vibrations and is a positive thing. It resembles my Sigma 10-20 EX in looks and feel. It takes good images! I have compared it in "blind" tests with my other 2 lenses at 35mm on a tripod. As expected the Sigma wins with the 35mm close behind. In particular the Sigma is much better than the 35mm at controlling CA. Although worthy, the kit lens is beaten hands down, especially towards the edges of the frame. The AF works very well, I tested this and found it was bang on - more accurate than my manual focussing skills. I would give this lens 5 stars if it was less expensive, but I guess you get what you pay for. This lens ticks all the boxes - great build and image quality so far, with stabilisation and useful zoom. I think however that if you can adapt to framing without zoom and have steady hands that a couple of Nikon prime lenses could do some of the job, possibly for less money. The Sigma gives good results at the 17mm end, which I find useful. I am very happy with this lens and would buy it again.

Great lens BUT I found some snags I was not expecting. I use this lens on a Nikon D7200 I love... Sharper than anything comparable I could find (see DXO Labs tests for info). Needle sharp at f3.3 wide angle and f2.8 zoom. Good light transmission makes it great for low light photos. Great value compared to Nikon. Sharpish at f11 so okay for landscapes. Not so keen... Can't switch from auto to manual focus durunh a shot without first switching on manual. If hand accidentally touches focus ring then it hinders auto focusing. Zoom ring works opposite way to Nikon lenses which feels odd. Flare can be a slight problem, more so than with Nikon originals where I find a lens hood unnecessary. Focus tracking of a person walking or running towards the camera works amazingly accurately with Nikon lenses but not with this lens. Perhaps the focus motor is too slow. In bright sunlit high contrast scenes with this lens the camera over exposes by about half to one stop which burns out highlights. That does not happen with original lenses. Overall, I am a tad disappointed but still rate it a great lens for the money. One last thought, the lense I received was a grey import with a 1 year warranty instead of the 3 years Sigma UK offer.

Lens is much better than I expected, I initially wanted the nikon version to use at weddings, however I couldn't justify the cost and was a little disappointed that I had to go for this version. After reading so many reviews and doing so much research into this lens the nikon 17-55 and the Tamron version I ended up choosing this one out of the 3. I am so glad that I did, the build quality for this lens is much better than I expected the zoom ring feels very tight and solid and the front element looks very nice. The only thing missing ergonomics wise is the old EX texture to the lens that sigma used to coat there lenses with which I was a fan of, this however doesn't impact the performance of the optics which are simply brilliant even wide open right across the focal range, its certainly an upgrade to any kit lens. I read a couple of reviews stating that is soft wide open, granted all lenses will be softer wide open however this isn't really noticeable and I certainly don't notice the difference if I'm not looking at Exif data. I would like to point out that this was based on centre sharpness. Border sharpness is slightly lower than the centre which is not an issue if you stop down, this isn't really as big a deal as some reviews/people make it out to be as in practice I only shoot portrait wide open and the boarder is usually out of focus anyway (due to depth of field effect) You would naturally stop down for landscape shots anyway thus bringing the entire frame into sharp focus including the boarders. I haven't really taken this off my D90 since buying it as the OS, coupled with the F2.8 constant aperture is very good for shallow Depth of field and low light portraits, so much so that I don't bother with my 50mm prime any more and I have sold it as a result. My only niggle is that Nikons Silent Wave autofocus system has full time manual override whereas this version of HSM doesn't as the focus ring moves on autofocus. All in all thought, this is a surprisingly very good lens which is incredibly sharp, useful low light and an excellent portrait lens I am unable to understand why the Nikon is so expensive when this is as good as it is for the cost (even comparing nikons non VR to cannons IS version threes almost 50% cost difference)

'Quality glass is more important than the camera it's on' is one of those statements you hear as a budding photographer but it doesn't quite sink in until you prove it to yourself. I've done that now with this lens. It is tremendous. My first trip out and I passed a man who had been taking his goshawk for a....erm. fly! The picture is heavily cropped to get rid of his arm and the straps on the birds legs but you can see that the clarity is superb and the background is nicely blurred out. This was as the light was going and so I had bumped the ISO up to about 1000/1250 I think. If I had been using my 18-105, I may have got a couple of sharp shots when the bird was still and lots that were blurred by the restless, constantly moving creature. Also, the background would have been more distracting. It seems to be sharp across the frame at any focal length and any aperture. The O.S. seems to work as well as anything I've used (18-105VR, Tamron 28-300VC (the model before the PZD)) but I think that the constant f2.8 makes it less useful anyway. Nice to have it though. Some other random snippets... It's my first Sigma and I'm happy with the build quality. I don't need professional build quality as I don't throw my lenses at my bag from 10 yards away or whatever it is they do to need such tough gear, but it will survive sensible knocks I suspect. I've looked at photos of Sigmas and thought they look cheap and nasty but they look good in the flesh. The zoom operates in the 'wrong' direction but I am getting used to that. It is fully functional on my Nikon1 J5 via the adapter too. Not all my third party lenses are.

I ordered this lens from Amazon, and was very disappointed to receive a grey import copy, which meant it wasn't covered by the 3 year UK warranty. But I was about to go on holiday so decided to keep it. It is very compact, and though fairly heavy at 565g feels lighter, sitting unobtrusively on my Nikon D7000. It seems very well made, and the zoom ring feels just right. It auto-focuses quickly and silently, and is spot on, the most accurate lens I've used. However, the focus ring turns when using AF, which is very poor for a lens in this class. The lens takes very beautiful images, full of colour, detail and impact, and it's very sharp. At F2.8 the image is sharp from top to bottom of the frame at all focal lengths, but soft at the sides. I don't see this as a problem, as at F2.8 you'll be trying to isolate your subject from the background. Closing down to F4 sharpens everything up, but corners remain soft at all apertures. Though there's visible distortion at 17mm, the images are still lovely. It focuses down to a little closer than a foot, and it retains all its sharpness. At 50mm and F8 it takes the most beautiful, colourful, detailed close-up images of any lens I've used (though note I've never used a macro). Wide open, there's visible vignetting at 17mm, but also surprisingly at 50mm. Although still very usable, I feel that this is the biggest weakness of this lens. Stepping down resolves the problem. You need to use the hood to avoid flare, but it's well controlled when fitted. Optical stabilisation seems to work well, though I don't think it's necessary for a 50mm F2.8 lens. And it really does drain the battery, much more so than other OS lenses I've used. -------------------------- However, while on holiday after owning the lens for less than 5 months, I noticed that auto-focus sometimes failed to engage. Flipping the AF button to manual and back would resolve it. When I got back home, I found that all the pictures, particularly at 17mm, were soft. The lens had suddenly started front focusing. Setting in-camera micro-adjust to +17 (max of 20) improved it, but the lens just wasn't as good any more. I Emailed Sigma UK to get it fixed, who advised me to return it to Amazon as it was a grey import (Bad Amazon). I contacted Amazon, and they said they'd give me full refund if I returned it (Good Amazon). 3 stars might seem a bit generous for a lens that lasted for less than 5 months, but it did take lovely pictures. And I am thinking about buying another as it still seems like the best all-round 17-50, though not a grey import this time.

Been using this lens for a few months now and constantly gives great results, with a lot of high points and only slight weaknesses. The AF is very accurate and fast, which is very important and sometimes not up to scratch on Tamron lenses I've tried. The 'OS'works well, although I personally prefer to try and get round low-light issues another way, it does always give you the option of greater depth of field (small aperture) or keeping ISO down (and of course slower shutter speeds). It feels nice and sturdy in the hand and about the right size for a general use zoom, with the star attraction of excellent image quality. At the 50mm end even f2.8 is very sharp, and at 50mm f4 onwards is it's party piece I suppose, where it is up with a Nikon prime, reaching ultra sharp levels. When using the wider angles you would notice a slight fall off of sharpness at f2.8 but by f4 is tidying up a lot and back in the exceptional range. The fluorite element gives beautiful colour and contrast rendition at all zooms. A very high quality offering from Sigma and IMO the best option at this zoom range for DX owners, where it mirrors the 24-70 focal lengths of general use PRO-FX lenses, and the quality. Use this lens to its strengths and your onto a real keeper and high performer with exceptional results. With wide angle wide open aperture shots being its only slight weakness, and that's me being picky!

If you’re expecting a straight out of the box and use lens, forget it After doing some research and finding out the hard way, I found that the focus is out on these lenses and has to be calibrated Being an owner of several sigma lenses, this came as a shock, especially when I found out on a shoot and had to compromise my image composition to account for the lens being “off” Bear this in mind when purchasing the lens

Zwischenzeitlich habe ich mein Sigma F2,8 EX DC OS HSM-Objektiv fast 2 Jahre und bin auch nach mehreren tausend Fotos jedes Mal auf's neue begeistert. Das Objektiv habe ich mir 2018 als Upgrade für eine D5300 gekauft. Mein Kitobjektiv habe ich, obwohl es als 18-105mm (F3,5-5,6) durchaus für einige Aufnahmesituationen besser geeignet wäre, seit dem Tag nicht wieder angefasst. Es hat mir einfach keinen Spaß mehr gemacht, weil es für 99% der Fälle die schlechtere Alternative gewesen wäre. Dafür ist das Sigma einfach zu gut. Inzwischen haben auch einige andere Objektive den Weg an meine Kamera gefunden und mit zunehmender Erfahrung habe ich auch einen etwas differenzierteren Blick auf die Optiken im Allgemeinen und auf das Sigma im Speziellen: Optimaler Brennweitenbereich für ein Standardzoom an APS-C An Vollformat ist unbestritten das 24-70mm 2.8 das universellste Objektiv. Für viele professionelle Fotografen ist es DAS Arbeitstier. Mit 24-70mm kann man an Vollformat alles machen, auch wenn es für einzelne Anwendungsbereiche natürlich speziellere Objektive gibt, die besser geeignet sind. Für Sportfotografie und Wildlife ist es bspw. etwas zu kurz. Das geht mit einem längeren Tele in den meisten Situationen besser. Das 24-70mm 2.8 ist mehr der Generalist als der Spezialist. An APS-C sieht das aber aufgrund des Cropfaktors etwas anders aus. Ein 24-70mm 2.8, dass natürlich ebenfalls an APS-C (Faktor 1,5 bei Nikon) verwendet werden kann, funktioniert dort wie ein 36-105mm. Dadurch fehlt einiges an Weitwinkel, jedoch gewinnt man auch einiges an Tele dazu. Das ist kein schlechter Brennweitenbereich, jedoch für Aufnahmen in Innenräumen unter Umständen schon zu lang und eben nicht so universell wie 24-70mm an Vollformat. Um das 24-70mm an Vollformat für APS-C zu ersetzen bedarf es eine kleinere Brennweite wie bspw. das Sigma 17-50mm. Umgerechnet entspricht das einem Brennweitenbereich von 25,5-75mm und deckt damit den Brennweitenbereich eines Standardzooms an Vollformat vollständig ab. Dank der durchgängigen Blende 2.8 ist auch an APS-C das Freistellen gut möglich. Bildschärfe teilw. auf Niveau von Festbrennweiten Je nach Brennweite ist das Sigma geradezu unverschämt scharf. Es beginnt bei 17mm relativ weich, gewinnt aber durch Abblenden gut an Schärfe. Ab Blende 4 sind die Aufnahmen scharf, wobei der Rand bis Blende 8 hier noch zulegt. Die Schärfe der Mitte wird aber am Rand nie erreicht. Ab 24mm ist das Sigma offenblendig scharf. Hier gibt es im Zentrum nichts mehr auszusetzen. Der Rand gewinnt aber durch Abblenden weiterhin. Bei 35mm ist es bei Blende 2.8 sichtbar(!) schärfer als mein Nikon AF-S DX Nikkor 35mm 1:1,8G - das Nikon dann auf 2.8 abgeblendet versteht sich. Lichtstärke Mit einer durchgängigen Blende von 2.8 erweitert es die fotografischen Möglichkeiten verglichen zu den lichtschwächeren Kitobjektiven gewaltig. Fotografieren bei wenig Licht und/oder das Freistellen von Objekten wird möglich, weswegen viele Situationen und Motive fotografisch deutlich besser behandelt werden können. Verglichen zu einem Standardzoom mit einer Blende von 3.5-5.6 sammelt das Sigma am kurzen Ende doppelt und am langen Ende vier mal soviel Licht ein. Das resultiert in dramatisch kürzeren Verschlusszeiten und einer dramatisch verringerten Tiefenschärfe, wodurch Objekte eben freigestellt werden. Verarbeitung Mit einem Gewicht von 565g ist das Sigma deutlich schwerer als die kleine Kitlinse und wiegt immer noch mehr als das Nikon 18-140mm 3.5-5.6 Reisezoom. Die Verarbeitung ist tadellos, der Zoom ist griffig und hat einen angenehmen Widerstand. Die manuelle Fokussierung ist dagegen etwas leichtgängig und hat lediglich einen Weg von 60° vom einen zum anderen Ende. Das geht besser. Mein Exemplar hat auch nach zwei Jahren intensiver Nutzung keine Gebrauchsspuren oder sonstigen Alterungserscheinungen. Autofokus und OSM Beide Systeme funktionieren tadellos. Der Autofokus ist ausreichend schnell und treffsicher. Beim Fotografieren von sich bewegenden Zielen geht die Ausschußquote aber natürlich nach oben. Beide Systeme arbeiten nicht geräuschlos. Da ich nicht Filme, kann ich zu der Eignung dieses Objektives hierzu nichts sagen. Die Konkurrenz Schaut man etwas Rechts und Links bieten die folgenden Objektive ähnliche Eigenschaften: AF-S DX Zoom-Nikkor 17-55 mm 1:2,8G IF-ED - verglichen mit dem Sigma geradezu unverschämt teuer (aktueller Neupreis EUR 1489,00) - laut DXOMARK sichtbar schlechtere Abbilungsleistungen Tamron SP AF 17-50mm F/2.8 XR Di II LD Aspherical o mit ca. EUR 300 ungefähr das gleiche Preisniveau wie das Sigma - laut DXOMARK minimal schlechtere Abbildungsleitungen Sigma 17-70mm F2.8-4 DC MACRO OS HSM C + mit 70mm etwas länger als das Sigma 17-50mm F2.8 EX DC OS HSM Nikon + größerer Abbildungsmaßstab - mit einem Preis ca. EUR 400 etwa EUR 100 teurer - laut DXOMARK sichtbar schlechtere Abbilungsleistungen - Lichtstärke ist am langen Ende nur wenig besser verglichen mit den Kitobjektiven und hat damit die gleichen fotografischen Einschränkungen wie eben diese. Mein Fazit nach zwei Jahren Für dieses Geld ist dieses Objektiv ein Pflichtkauf an APS-C. Das Preisleistungsverhältnis und die Bildschärfe sind phänomenal! Die fotografischen Möglichkeiten durch die hohe durchgehende Lichtstärke sind enorm und durch den Brennweitenbereich passt es an APS-C für viele Aufnahmesituationen. Klare Kaufempfehlung!

The product was delivered way before the committed date in excellent condition. The packing was very good. I highly recommend both the product and the seller

Pro: luminosità, rapporto qualità prezzo impareggiabile e costruzione. Contro: qualche volta l'autofocus non è precisissimo. Paraluce con attacco un po' leggero Obiettivo preso per sostituire il 18/55 del kit e non posso dirne che bene. Un'ottica eccellente e con una resa davvero ottima. Solido in mano e con una focale fissa così luminosa, mi ha regalato molte soddisfazioni (su d5200). Mi sento di consigliarlo a tutti, a chi inizia e a chi è un semi pro. Non ve ne pentirete e poi a quel prezzo è davvero ottimo. Poco da invidiare al 17/55 f2.8 di casa Nikon. Unica pecca il paraluce, che non sembra saldissimo.

Llevo poco tiempo con él, pero, de momento estoy encantado. La calidad de construción es buena, la distorsión, nitidez, aberración y demás parámetros de imagen, me parecen excelentes. Un buen boké gracias a su f2,8 en todas sus distancias focales. Una opción insuperable para los que buscan mejorar el clásico objetivo de Kit. No hay comparación posible. Eso si, bastante más grande y pesado que este. Una buena elección como objetivo para viajes, fotografia urbana, paisajes, retratos, fotagrafía nocturna, etc... Buen funcionamiento del autofocus, rápido, preciso y silencioso. Buen VR. Nada que envidiar a opcones más caras de la marca de la cámara, en mi caso Nikon.

Côté mise au point , c'est quasiment un sans faute . Le Sigma 17-50 mm F2.8 DC OS HSM est rarement pris à défaut ... de ce côté là ...c'est suffisamment capital , pour apprécier cet aspect à "sa juste valeur " .. Une motorisation réactive ,et peu bruyante !(mais cela reste logiquement plus largement audible qu'un système USM , lequel "reste un summum spectaculaire" !!! ,une référence... évidemment ...). La mise au point est donc juste , et la motorisation se montre suffisamment réactive pour offrir à l'utilisateur ce très agréable sentiment de confiance et de confort d'utilisation qui est toujours le bienvenue en toutes circonstances , lors des prises de vues .. "Sureté" donc , de ce côté là ! Du côté du stabilisateur optique , c'est aussi plutôt réussi , et sans que celui ci soit flamboyant , il effectue son travail très correctement , et assiste finalement,le photographe , en des situations légèrement incertaines , tout comme lors des mouvements vifs ou en condition de basse lumière ou de fort contrastes. Notons que cet objectif se trouve particulièrement à son aise pour les portraits , pourvu que l'on se positionne correctement , par rapport au sujet . Ce qui plait ici plus particulièrement quant à son 50 mm !!! : c'est qu'il offre tout son potentiel , sans fléchir !!! Ainsi , concernant son acuité à 50 mm , cet objectif impressionne vraiment par son piqué , mais c'est surtout et aussi , à cause du fait qu'il n'occasionne que peu de distortions à l'image .. et très peu de déformations des perspectives et visages . Les visages conservent ainsi , en portraits tout leur naturel . L'objectif demeure à presque toute les focales , agréable , au niveau des rendus , et l'image conserve une belle tenue , au niveau du piqué , tant au centre de l'image ou le piqué est très bon ... , alors qu'il reste bon jusqu'aux bords . A 17 mm il m'a moins impressionné ... côté piqué et rendu général ... Mais pour son prix , il ne fait aucun doute que cet objectif est bien plus que bon , et s'avère "totalement" remarquable , sans la moindre ambiguité possible . Un domaine où le Sigma 17-50 mm F2.8 OS HSM EX , reste très légèrement ! en deça .. c'est dans la transcription et la restitution colorimétrique , ... une très légère désaturation , il n'éblouie pas côté , vivacité des couleurs et respects tons ... il demande volontiers à ce que l'on travaille un peu plus les tons , que nous partions à la recherche de la tonalité ,il la plus plaisante , la plus appropriée . Travailler les rendus ... en post!! Ou bien,de volontiers et encore plus que d'habitude , travailler sur votre boitier "les modes de rendus" ou "picture controls" , au préalable , comme d'habitude pour vos JPEGs , et de les soigner en l'occurence plus particulièrement . Il y a donc , un peu plus de boulot qu'avec d'autres objectifs ,un mini "challenge", qui est d'ailleurs loin d'être désagréable ... lequel porte bien vite ses fruits , car les rendus deviennent par la suite fort réjouissant . Quoiqu'il en soit , en terme colorimétrique , Il demeure supérieur à la moyenne , et nous pourrons même dire excellent , juste ... qu'il reste en ce domaine légèrement en retrait , par rapport à d'autres objectifs que j'ai pu utilise. - Concernant le contraste natif , il est très bon . Quand vous parvenez à une bonne retranscription des tons , ce très bon contraste rattrape !! et souvent couronne l'ensemble , donnant ainsi à l'image une très agréable personnalité . Cet objectif , à donc bien de très bonnes prestations à offrir , à son utilisateur et avec qui saura composer avec ces relatives petites faiblesses , mais qui sont aussi le fait , qu'il faut aussi être conscient , que cet objectif doit d'abord être "bien" correctement , utilisé . La vivacité des couleur ou la température et la balance des blancs seront sûrement à revoir ,sur certains plans . Bien plus , qu'avec un objectif Canon série L , par exemple , avec lequel son piqué général est presque !!!! .. comparable ....... et ce n'est pas un mince compliment .... Un autre point , qui est rarement abordé ... et pourtant , ce 17-50 bénéficie d'une ouverture barillet très large !!! 77mm ... pourquoi est ce plaisant ? , en fait j'ai souvent remarqué , qu'un objectif à large champs mettait souvent à son aise le sujet , moins étriqué qu'un objectif de 52 mm ... Les portraits n'en sont souvent que plus naturels . Le 17-50 , est bien construit , la finition est au rendez vous ! Et je confirme que le "Lens made in Japan " met objectivement ( sourires ! ) les photographes en confiance , quand à la fabrication impeccable de l'optique . De contruction relativement robuste , son poid met en confiance ( BON POINT) très bonne équilibre . J'aime les objectifs un peu "lourds" . La manipulation du zoom se fait TOUT en souplesse et est suffisament ferme ... pas toute ramolie , excellent ! je n'ai pas à me plaindre , d'aucune fragilité , dans la conception générale . La finition est de bonne à excellente ! Remarque : les interrupteurs on/off du stabilisateur et de l'"autofocusing" sont BIEN TROP souples , et il peut arriver que par inadvertance , vous désactiviez involontairement le système AF et le système de stabilisation . L'objectif est livré avec un très bel étui renforcé et extrêmement robuste ! le point que tout le monde apprécie : ... cet objectif est capable d'ouvrir à 2.8 de façon constante sur toute la plage , de 17 à 50 mm .... c'est un plus énorme ...!!! A ce niveau de prix c'est une prestation extrêment appréciable . MAIS : Le piqué à 2.8 ne m'a aucunement impressionné , ... , et je préfère fermer légèrement vers 3.2 ... voire remonter vers f4 , et monter la sensibilité du capteur du boitier si nécéssaire , pour aussi modérer les très légères abbérations chromatiques , qui demeurent très bien controlées , sur ce caillou ! Le contraste et le piqué sont dès f4 assez ""impressionnant""... confirmant le rapport qualité prix exceptionnel , pour un tel produit ... La prestation générale , est donc plus que remarquable . je confirme le niveau niveau de piqué qui a été rappelé à de nombreuse reprise , tout autant que celui est agréablement réparti sur toute l'image , et ne concerne pas seulement , comme TROP souvent , chez certains objectifs , que le centre de l'image . Concernannt les compressions JPEG : veillez à bien régler les sur votre boitier , les tons et saturation qui ont votre préférence ... de neutre à très contrasté les degrés Kelvin ou tempétures suivant vos gouts , ... etc ... couleurs . En Raw : soyez conscient si possible , des atouts , points forts , prestations et légères faiblesses , de cet objectif . ... Là ou je le trouve super ? la photo d'intérieur , les portraits , ... ou son piqué impressionnant donne un côté si vrai au situations... Beaucoup de photagraphe , ( la très grande majorité ) ( c'est un usage si traditionnel en photographie ) aiment une netteté en retrait et des contours très très très doux , pour les portraits. Dans ma pratique photo , bien au contraire !! .. Pour la vitalité , la vivacité , j'aime profiter d'une grande révélation d'acuité pour les scènes de la vie en famille par exemple !! et les intérieurs . Cet objectif tient encore imppecablement sans fléchir côté piqué , sur un boitier 24 mégapixels , et ce n'est pas là une moindre chose . Un objectif sûr , surtout à découvrir et apprécier . Très bonne pratique photo à Tous