Everyone and today ill be reviewing the living daylights out of a brand new sigma lens designed for mirrorless cameras with a smaller aps c sized sensor, the 18 50 millimeter f 2.8 dc dn. It will be for sony e mount and also l mount cameras and will cost only 430 pounds in the uk. That is a fantastically low price for a bright aperture. Zoom lens like this, the price in us dollars will be in the description below id like to. Thank sigma for loaning me this lens for a week or two for testing, although, as usual, this is a totally independent review that basic, but nonetheless useful zoom range of 18 to 50, millimeter or 28 to 75 millimeter in full frame terms, combined with a bright maximum Matcher of f 2.8 makes this a fast standard, zoom lens one of the most challenging ones out there for manufacturers to design, while also being one of the most enjoyable and useful for photographers to actually get out and use. You wouldnt guess that this is an f 2.8 lens, though from its tiny size, just look at it, its about the same size as a zoomable kit lens with a much darker aperture. The first fast standard, zoom lens i ever owned. Was this old f, 2.8 monster for canons, aps c digital slr cameras, which is well over twice as big and heavy as this new sigma option, not to mention much more expensive, so it doesnt take sherlock holmes to guess that sigmas design priority was a compact size.

Here and have clearly succeeded, well see in a minute how that might or might not affect its image quality. Something to mention early on is that this lens does not have its own image stabilization. A slightly risky decision by sigma, as not all of sonys smaller cameras are image stabilized, although the newer ones are all going that way now and for anyone, whos curious heres. What the lenses image looks like on a full frame camera. As you can see, the image fits quite tightly around the aps c image area lets start by looking at build quality. The main body of the lens is made of plastic and at under 300 grams, its not very heavy, but it does feel very solid and tightly assembled without any wobbling or shaky parts. The lens mount is made of metal with a weather sealing gasket around the edge. The lens does not have an auto manual focus switch, but you do get this plastic focus ring which turns quite smoothly and works responsively with the focus motor. Some good news for video makers is that, whether youre zoomed in or out, we see almost no focus breathing with this lens heres, the auto vegas motor in action. This footage was taken in relatively low light. Even then, the focus motor is silent, accurate and relatively quick. So again, thats very good for video work. Next on the lenses body comes the zoom ring, which is rubberized and turns extremely smoothly being very well damped and not encountering any stickiness again.

That is excellent news for video makers. The lens is not par focal. If you zoom in and out quickly, then you can see a temporary loss of focus, but even in manual focus mode, it almost instantly readjusts itself to focus on the right point again as you change focal length. So you never really notice. The lens comes with the usual caps and a nice quality. Little plastic hood with a little rubber trimming to it and its filter size is a small 55 millimeters. It doesnt come with a carry case or bag. So while the lens doesnt have image stabilization, it does. However, cover every other base with good build quality, excellent, auto focus, low focus breathing. It could be an especially nice option for video making now lets see about image. Quality ill, be testing. This lens on my sony, aps c camera a little 24 megapixel a5100 in camera. Corrections had turned on for this test at the widest angle of 18 millimeter and f 2.8. We see perfect resolution and contrast in the middle of the image. The corner image quality looks a little soft, though stop down to f4 for a little improvement and at f 5.6. They now look sharp. They stay this sharp down to about f 11, although if you stop down to f 16, unsurprisingly, the whole image begins to soften due to the unavoidable effect of diffraction lets zoom in a bit now to millimeter at f 2.

8 again, the middle of the image sees Absolutely razor sharp image quality over in the corners. Again, we see some softness at f4. They look just as soft, but at f 5.6. There is a small improvement at f, 8 and f 11. The corners look, nice and sharp now. Finally, lets zoom all the way into 50 millimeter at f 2.8. The middle of the image looks excellent, although not quite as razor sharp as at wider angles. The corners at f 2.8 also look a bit softer than they did at wider angles, f4 and f5.6. Look about the same in the corners, although i can tell you that the middle quickly becomes razor, sharp, again stop down to f8 or f11 and those corners finally sharpen up so its a pretty simple conclusion from all these tests. The lens is always fantastically sharp in the middle of your images, with good contrast and low chromatic aberration, but the image corners are softer at brighter apertures other fast standard. Zoom lenses can get a little sharper than this, but if you dramatically scale down a lenses size, then there will always be an optical downside somewhere anyway. Lets take a look at distortion and vignetting. If we turn off the in camera, corrections at 18, millimeter and f 2.8, we see some pretty wild barrel distortion and very strong vignetting in the corners stop down to f4, f5.6 and f8 for those corners to brighten up zoom into 25 millimeter and the distortion flips Into a slight pin cushion pattern and at 50 millimeter that too becomes very strong and again with dark corners at f 2.

8. Again, though, at f4 at 5.6 and f8, the corners brighten up a lot. So we encounter some major problems. There be sure to keep those in camera. Corrections firmly turned on now, then close up image, quality and sigma advertised that as a strong point in this lenses, design, zoom all the way into 50 millimeter and you can focus much closer than average, which is lots of fun. Less encouraging is the very poor close up image quality at f 2.8, however, at f 4 and f, 5.6 sharpness and contrast greatly increase and at f 8 any visible chromatic. Aberration disappears, leaving behind perfect picture quality, so thats what happens when you zoom in? But if you zoom the lens out, you can get even closer to your subject dramatically. So, in fact, here my baby camera clock is only millimeters away from the front of the lens casting it into the lenss shadow. What an image, though, at that brighter angle, the close up image quality is now brilliantly sharp, even straight from f 2.8. So you have some interesting options for shooting smaller subjects here now lets see how the lens works against bright lights at wide angles. An average amount of flaring can be seen here, but its nothing especially bothersome, zoom in and if bright lights are directly in your picture, you lose a bit more contrast. Lets take a look at this lenses. Bokeh deeply out of focus backgrounds. Look quite nice here in the middle distance, however, we can see a little busyness and some longitudinal chromatic aberration.

Look at those blue outlines on strong highlights in this picture. Well, lets look a little closer longitudinal chromatic aberration id have 2.8, as you can see its extremely strong stop down to f4, f5.6 and f8, and it slowly goes away overall. This was an interesting lens for me to test out, as it does offer something a bit different, a fast standard, zoom lens thats. This tiny is virtually unheard of and whats more and it has very nice build quality, with especially lots of advantages for video work. It has great close, focusing ability too, and its good value for money on the downside. Its tiny design has entailed some optical compromises, softer corners at f2.8, longitudinal chromatic, aberration and bokeh that isnt always convincingly soft. It also does not have its own image stabilization, which will be a disadvantage if your camera doesnt have it built in. At the end of the day, though, its tiny and very useful, its sharp in the middle of its images, with very good contrast and its well assembled and most of all, that low price of only 430 pounds is truly fantastic. It blows away the competition from sony and tamron in that way it makes this lens, viable and affordable, upgrade to whatever cheap zoomable kit lens you might currently be using. Bearing that in mind any optical issues, it has are really quite forgivable, in my opinion, making it very good value for money, so it certainly does come recommended.

You know what else is forgivable me plugging my patreon page at the end of a video of course duh.

https://www.youtube.com/watch?v=Ymx2Lx5A22U