Sometimes the future creeps up on you quicker than you expected. We’ve been thinking about re-starting our Throwback Thursday series for a while, but Sigma’s announcement of a 75-180mm equivalent lens for APS-C rather forced our hand.

This year marks 20 years since Sigma launched the original APO 50-150mm F2.8 EX HSM DC, a fast 75-225mm equivalent zoom for APS-C. A lens that gave APS-C DSLR users the range and utility of a classic 70-200mm but without the cost or weight of one.

DPReview marked the date with a single-paragraph news story along with Sigma’s press release, which was our standard level of lens coverage, back when the site had only a single full-time member of staff. We described it as “very interesting sounding.” Even for Phil’s level of British understatement, this is to significantly under-sell the lens. At a time when full-frame was out of reach for all but the most committed enthusiasts, this gave APS-C users a lens they hadn’t had before: a dedicated, fast 70-200mm equiv.

Richard Butler

A slightly revised Mark II with very similar specs was released in 2008 and a copy made its way to the DPReview offices. It must have been a Nikon version as there are samples in the review gallery of the Nikon D5000 and D300S reviews the next year. There’s one shot by Phil, but the rest seem to be by me. Because I loved that lens.

Sigma

I’d arrived at DPReview as the owner of both an APS-C DSLR and a 70-200mm F2.8 that I barely ever used because it was just too big and heavy to casually carry around. Even having bought it second-hand, it ended up being one of my least cost-effective photographic purchases ever.

The 50-150mm was a revelation: it was less than two-thirds the size of most 70-200mm F2.8s, less than two-thirds of the weight and something like two-thirds the price. Unsurprisingly, it was much more directly comparable with the dimensions of Canon’s popular 70-200mm F4, but offering a range I found more useful and with an extra stop of light capture on the APS-C cameras we tended to be testing.

Richard Butler

Richard Butler

It had the range to let me shoot things like bike racing and also made a pretty handy portrait lens, as it was much easier to handle and much less intimidating than a full-sized, tripod-footed 70-200 F2.8. And its compact size meant I did actually carry it around with me. And got more photos, as a result. The 50-150mm taught me an important lesson about how different formats can shine, if they’re properly supported.

I used it regularly over the time we had it and was disappointed when its stabilized replacement used the same housing as the 70-200mm F2.8 launched alongside it: giving up the size and weight benefits that appealed so much in the first place. It’s what perhaps made me a little over-excited when, years later, Fujifilm and Samsung produced similar lenses, even though they weren’t as small or light as I’d hoped.

I think I’ve requested or asked after a 50-150mm successor almost every time I’ve met Sigma’s CEO, Kazuto Yamaki. I thought I was reading too much into his response when he seemed more positive about the idea, last time we met.

But the only thing that excited me more than hearing that Sigma was about to lauch a spiritual successor to the 50-150mm F2.8, was unboxing it for the first time and finding out that the new lens is even smaller and even lighter than its DSLR forbear. And, looking at the images: sharper and better able to focus, too. I wonder if this new lens will inspire the same decades-long appreciation.

Sigma has announced the 50-120mm F2.8 OS DC | Contemporary, a fast telezoom for APS-C mirrorless cameras. The lens delivers a 75-180mm equivalent range for Fujifilm X or Sony E mount cameras and an 80-192mm equiv range for Canon RF users.

The lens is a spiritual successor to the excellent APO 50-150mm F2.8 EX DC HSM from 2006, but manages to add stabilization and downsize considerably.

At just 67mm wide and 99mm long (3.90 x 2.63″) for the E-mount version, the lens is smaller than a standard can of Coke (both the 330ml and 12oz versions). Its length extends by 25% when zoomed to its full extreme but is still only a fraction longer (5mm/0.2″) than Canon’s RF 70-200mm F4 in its retracted form. It weighs 390g (13.8oz), which again is remarkably similar to the weight of a full can of Coke.

Richard Butler

The 50-120mm completes a trio of F2.8 zooms for APS-C mirrorless, alongside the existing 10-18mm F2.8 and 18-50mm F2.8 lenses. Despite its longer range and similarly bright aperture, it shares a 55mm filter thread with the 18-50mm. It’s the only member of the F2.8 DC set to have a dedicated aperture ring and image stabilizaton.

That stabilization is rated at 6.5 stops of correction at 50mm and 4.5 stops at the 120mm long end, per tests conducted to CIPA’s standard methodology.

Richard Butler

The new lens uses a “high response linear actuator” for autofocus and has seemed swift and reliable from our usage so far, though we’ve not been trying sports shooting with it just yet.

The optical design utilizes 18 elements in 13 groups, including one fluorite-like FLD element, three super-low dispersion elements and four aspherics. The company says it’s been designed to exhibit minimal focus breathing, to extend its usefulness to video. It features 11 rounded aperture blades to keep bokeh circular.

Richard Butler

The lens barrel features a zoom ring, focus ring and a dedicated aperture ring (on the Sony and Fujifilm versions, at least) with an ‘A’ position. The Canon RF version will have a smooth-rotating control ring instead of an aperture ring.

As part of the Contemporary series it’s been designed to be dust and splash resistant. Its presence in Sigma’s more affordable line also means it’s priced at a remarkably reasonable $799.

Shooting experience

I’ve been shooting with a Fujifilm mount version of the lens for a week or so and I’m still caught off-guard occasionally that I’m using a 70-180mm equivalent, rather than a standard zoom.

Richard Butler

The aperture ring, the first on one of Sigma’s DC zooms for mirrorless, works nicely with the X-T4 and X-H2 bodies I used it on, though I did wish the lens could be locked in or out of the A position, rather than it simply being spaced a little further beyond F22.

For the size and the price, I was willing to forgive some pretty major image quality issues but didn’t encounter too many.

Close focus isn’t this lens’s strength, with the corners getting extremely soft and swirly if you shoot a flat subject a 50mm. Things are a lot more predictable near minimum focus distance at the long end of the zoom.

The swirliness makes a reappearance in the bokeh at times, but not in a way I found objectionable. In general, I found the bokeh to be soft and attractive, without any fussiness, which isn’t always a given for a fast tele zoom.

Richard Butler

In general, sharpness seems impressive, despite the use of X-Trans sensors, which our standard lens processing doesn’t always show to its best effect. There appears to be a small degree of pincussion distortion being corrected at both ends of the zoom, but nothing dramatic (it doesn’t appear to account for the close-focus strangeness at short focal lengths).

Richard Butler

It’s hard for me to be completely dispassionate about a lens that I’ve been hoping someone would make, for years, but I’m genuinely stunned by how small and easy-to-carry Sigma has managed to make the 50-120mm F2.8 OS. I look forward to shooting it for longer, once RF-mount versions are available, to see how it behaves on the EOS R7, since that’s currently the highest-res Bayer APS-C sensor.

As always, we’ve included Raws for download in our gallery, including some close-focus examples and a couple of aperture comparisons, so you can make your own assessment.