Sigma 50100mm F18 Dc Hsm Art for Canon Used
You lot have to give it to Sigma, the visitor is making some superb, unique lens options for all types of cameras. The 50-100mm f/1.8 DC HSM Art for Nikon F, Catechism EF, and Sigma SA APS-C cameras is one of the oddest, with a fast abiding discontinuity and a short telephoto to medium telephoto range equivalent to 75-150mm. Designed equally an platonic complement to the xviii-35mm f/i.8, this lens is designed to supplant 3 primes with 35mm equivalents of 85mm, 100mm, and 135mm without sacrificing a fast aperture. Fortunately, Sigma was able to really come through with outstanding functioning, even wide open up, with crisp details and few to no aberrations.
I honestly wasn't expecting much when I was given this lens; a zoom lens with a constant f/one.eight discontinuity seems like a fantasy, and had the skeptic in me ready to pounce. In order to examination it, I put it on my a7R 2 with an electronic adapter and ready information technology to APS-C style. Besides the convenience of beingness able to shoot this lens with my regular camera, this configuration besides offers the advantage of letting me try the lens in full-frame mode—a common question nowadays, since many users are adapting lenses to multiple formats. Luckily, the lens functioned nearly perfectly with the adapter, allowing for fast, accurate autofocus. The focusing system did make more racket than many of its contemporaries and seemed to "hitting" the ends when reaching minimum and maximum focusing distances. No cause for alarm, simply simply lacking the finesse of a native Canon zoom.
A hefty lens
Ane other matter to notation is the size. Photography and physics have e'er gone head-to-head when it comes to lens blueprint. You can simply make a lens so small before you lot seriously compromise on performance. Sigma went the less compromising route and, as a result, you have a hefty lens. It weighs iii.three pounds and measures half dozen.7" long, so information technology's not exactly a lens y'all but toss in your bag for a twenty-four hour period out. This also means it weighs more than a couple of primes in the same range, and so y'all are really going to need to justify having a zoom for this purpose. A more conventional 70-200mm f/2.8 would exist similar to this lens in size and weight, merely with double the range. Sure, y'all may lose a stop of light, but if you are looking for a telephoto zoom the extra achieve tin can be extremely helpful. A bonus is that most lxx-200mm lenses are uniform with full-frame cameras, should you lot upgrade after.
Anyway, back to the optics. Sigma did blast this lens design, making performance a pinnacle concern, and threw in all of the company's bells and whistles, including a series of low dispersion glass elements, a loftier refractive index element, and Sigma's Super Multi-Layer Coating. Also, the f/1.eight discontinuity will be greatly appreciated for its power to throw backgrounds beautifully out of focus with an exceptionally abrupt center frame. At f/i.eight, in that location is a modest corporeality of vignetting, which is not surprising, given the pattern, but worth mentioning. Flare is well controlled and information technology doesn't seem like in that location are whatever significant advantages or disadvantages to either the 50mm or 100mm ends.
Fast focusing and sharp performance
The lens is sharp, which seems to be a major focus of Sigma's revamped Global Vision lineup. It is fully compatible with the USB Dock for firmware updates and focus adjustment. I didn't need to use it with the α7R 2'due south on-sensor focusing, but having used the software in the past, I tin can say it is worth having. As you stop downwards, performance evidently improves past increasing sharpness and decreasing vignetting. Distortion is, for all intents and purposes, non-real, which makes sense because the focal length. Normal to medium telephoto lenses are generally quite skillful when it comes to minimizing distortion.
Now, one omission of the lens is image stabilization. This isn't a huge business concern, since many primes in this range wouldn't have information technology, merely many users would have likely appreciated it for a 75-150mm equivalent zoom considering the obvious comparison would be a 70-200mm f/two.8. The tripod foot, much like the 150-600mm Contemporary lens, is extremely small. Information technology may work, but it is tougher to fiddle with, and the smaller fit would exist less effective at steadying the lens. A squeamish feature of the tripod collar, even so, is the stops every xc degrees, and then you can lock-in the proper positions easily.
The residuum of the lens feels solid. Information technology feels good in the hand, has decent balance, and the focus and zoom rings are quite smooth. It is a fleck large for the limited range, just it does the job well. Sigma doesn't state that at that place is whatsoever pregnant conditions sealing, which I find to be a major weakness for this type of lens. Users are going to have to be cautious if they determine to pull it out on a rainy twenty-four hour period.
Where the image circle ends
And, for those who are curious, here are some samples of what the epitome circle looks like on a full-frame trunk. At 50mm there is strong vignetting where the image circle ends, merely there is a good bit of workable space vertically, making information technology useful for getting a little extra height in some images. At 100mm, information technology will encompass the entire frame with some noticeable vignetting in the corners, but null Photoshop tin can't assist prepare. It is nice to know that if you lot demand a picayune actress on the edges you tin utilise a larger expanse of the sensor. The corners do fall off pretty badly on full frame but, for a picayune extra infinite, the extra pixels can be extremely useful.
A note for video shooters: the lens is not perfectly parfocal, but comes very shut. I could see this being used for documentaries quite often. Videographers will probable greatly appreciate this lens because information technology covers Super35 and provides boosted depth-of-field command.
After using the l-100mm, I was pleasantly surprised by the sharpness and control over aberrations. However, I struggle to see where many photographers would demand a single large zoom over ii or three compact primes. Photographers working in environments where lens changes are dangerous to the camera or where speed is critical may find this to be a lifesaver, only otherwise I personally feel a couple of nice primes would exist a much better, and lighter, option. As a companion to the visitor'southward xviii-35mm f/ane.viii, information technology is a great pick, and it makes sense for users looking for a 2-lens setup to fill up all their basic needs.
Source: https://www.bhphotovideo.com/explora/photography/hands-review/hands-review-sigma-50-100mm-f18-dc-hsm-art-lens
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