# Sigma 50-120mm f/2.8 for video: what to check on FX30, A6700 and Canon RF

> Sigma's 390 g APS-C tele zoom costs €799. For video: the barrel extends, Sony's breathing fix won't work, filters are 55 mm, and the RF version differs.

- URL: https://www.4filmmakers.co/news/sigma-50-120mm-f2-8-video/
- Publisher: 4FILMMAKERS (https://www.4filmmakers.co/)
- Topic: Accessories (https://www.4filmmakers.co/topics/accessories/), Cameras & drones (https://www.4filmmakers.co/topics/cameras/)
- Published: 2026-11-03
- Updated: 2026-11-03
- Keywords: Sigma 50-120mm f2.8 video, Sigma 50-120mm FX30, Sigma 50-120mm focus breathing, Sigma 50-120mm internal zoom, Sigma 50-120mm filter size, Sigma 50-120mm vs Fuji 50-140mm, APS-C telephoto zoom for video, Sigma 50-120mm price euro

The Sigma 50-120mm F2.8 DC OS Contemporary is a 390 g APS-C telephoto zoom for Sony E, Fujifilm X and Canon RF, on sale since 22 October 2026 for €799 in Europe and $799 in the US. That's about 75-180mm in full-frame terms at a constant f/2.8, with 4.5 to 6.5 stops of optical stabilisation. For video, check four things before you order: the barrel extends as you zoom, Sony's Breathing Compensation doesn't list it, the filter thread is 55 mm, and the Canon RF version looks different from the other two.

We went through Sigma's product pages, the official photos of all three mounts and Sony's compatibility lists to answer the video questions. We haven't shot with the lens ourselves, so where a question needs a hands-on test that nobody has published yet, we say so.

## In short

- €799 at German and Austrian shops on 3 November 2026, $799 in the US. We couldn't find a confirmed UK price.
- 390 g and 99 mm long on Sony E, with 55 mm filters. Sigma's photos show the front barrel extending at 120 mm, so expect to rebalance a gimbal when you zoom.
- Sigma says it designed the optics to minimise focus breathing. Sony's Breathing Compensation list for the FX30 and A6700 includes only Sony lenses.
- The lens has no AF/MF or OS switches. The Sony and Fuji versions have an aperture ring marked A to 2.8; the RF version's photo shows no aperture scale.
- With the 10-18mm and 18-50mm F2.8, you get about 15-180mm equivalent at f/2.8 for 935 g on Sony E, and the trio costs €1,947 at today's prices.

## What are the specs that matter for video?

The Canon version weighs 20 g more and is 2 mm shorter. Sigma lists the same 18 elements in 13 groups for all three.

Table: Sigma 50-120mm F2.8 DC OS | Contemporary, official specifications

| Spec | Sony E | Fujifilm X | Canon RF |
|---|---|---|---|
| Full-frame equivalent | About 75-180mm | About 75-180mm | About 80-192mm (1.6x crop) |
| Weight | 390 g | 390 g | 410 g |
| Size (diameter × length) | 66.8 × 99.0 mm | 66.8 × 99.3 mm | 69.0 × 97.0 mm |
| Aperture ring | Yes, A to f/2.8 (in Sigma's photos) | Yes, A to f/2.8 (in Sigma's photos) | No aperture scale in Sigma's photo |
| Filter thread | 55 mm |  |  |
| Stabilisation | OS2, 6.5 stops at 50mm, 4.5 stops at 120mm (CIPA) |  |  |
| Autofocus motor | HLA linear motor |  |  |
| Closest focus | 23 cm at 50mm (1:3), 55 cm at 120mm (1:4.7) |  |  |
| Aperture blades | 11, rounded, down to f/22 |  |  |
| Switches | None: Sigma removed the AF/MF and OS switches |  |  |
| Weather | Dust and splash resistant, water and oil repellent front element |  |  |

The 23 cm closest focus at 50mm is the spec we'd use most. At 1:3 you can fill the frame with a watch face or a coffee cup for product inserts without a macro lens. Shooting tight at 120mm, you have to stand at least 55 cm back.

## Does the Sigma 50-120mm extend when you zoom?

![The Sigma 50-120mm F2.8 DC OS Sony E-mount version set to 120mm, with the inner barrel extended and the lens hood attached, on a light background](https://www.4filmmakers.co/news/sigma-50-120mm-f2-8-video/images/sigma-50-120-extended.webp)
*The Sony E version set to 120mm, hood attached: the inner barrel slides out. Image: Sigma, graded by 4FILMMAKERS.*

Yes. Sigma's own product photo of the E-mount version at 120mm shows an inner barrel sliding forward. The spec sheet gives a single length, 99 mm. On a tripod or handheld that's fine. On a gimbal, balance at 50mm, zoom to 120mm and the weight moves forward, so the motors work harder or you rebalance. If you live on a gimbal, pick one focal length per setup and balance there.

Sigma doesn't publish the extended length, so measure it in the shop if your gimbal plate has little room to slide.

## Will Sony's Breathing Compensation work with it?

Not according to Sony. We checked Sony's official Breathing Compensation compatibility pages on 3 November 2026: the lists for the FX30, A6700 and the other bodies include only Sony lenses, with no Sigma models. So the FX30 menu option won't do anything with this lens.

Sigma says the optical design itself keeps breathing low, "with little change in composition". That's a design claim. We haven't found an independent measurement of breathing yet, on any mount. If you pull focus on camera between two faces, test it in the shop or wait for a breathing test before you plan a narrative shoot around it.

## What changes from one camera body to another?

Body stabilisation changes how much the lens OS gives you. Sigma rates OS2 at 6.5 stops at 50mm and 4.5 at 120mm, measured on an APS-C mirrorless camera. Sigma doesn't say how the lens OS combines with each brand's IBIS, and we haven't seen a test that measures it.

Table: Sigma 50-120mm on popular APS-C video bodies

| Body | IBIS in body | What to know |
|---|---|---|
| Sony FX30 | Yes | No Breathing Compensation with this lens. Aperture ring on the lens, or set it to A and use the camera dial. |
| Sony A6700 | Yes | Same as the FX30. A small body, so a 390 g lens stays comfortable handheld. |
| Sony ZV-E10 II | No | Lens OS is your only optical stabilisation, which makes this zoom more useful here than on the FX30. |
| Canon EOS R7 | Yes | About 80-192mm equivalent. No aperture scale on the RF version, so you set the aperture from the camera. |
| Canon R10, R50, R50 V, R100 | No | Lens OS does all the optical stabilisation work. Check Sigma's RF compatibility notes for your body before buying. |
| Fujifilm X bodies | Depends on model | Fstoppers' hands-on found touch-to-focus slow in video on Fuji and blamed the body, not the lens. |
| Nikon Z DX | n/a | No Nikon Z version announced. |

With no switches on the barrel, you can't flick to manual focus mid-take, so put AF/MF on a custom button before the shoot. The same goes for turning OS off on a tripod: it lives in the camera menu now.

## Which ND filter size do you need?

The 50-120mm and the 18-50mm both take 55 mm filters. The 10-18mm takes 67 mm. If you own the trio, one 67 mm variable ND with a 55-67 mm step-up ring covers all three. That's cheaper than our usual advice of buying 82 mm and stepping down, which we explain in our [variable ND guide](https://www.4filmmakers.co/news/best-variable-nd-filters-82mm/), but it only makes sense if you stay on small APS-C zooms.

Table: Filter sizes of the Sigma APS-C f/2.8 zoom trio

| Lens | Filter | Weight (Sony E) | Price in Europe |
|---|---|---|---|
| 10-18mm F2.8 DC DN | 67 mm | 255 g | €699 |
| 18-50mm F2.8 DC DN | 55 mm | 290 g | €449 |
| 50-120mm F2.8 DC OS | 55 mm | 390 g | €799 |
| All three | One 67 mm VND + 55-67 step-up | 935 g | €1,947 |

Prices are the lowest listings on heise Preisvergleich on 3 November 2026, for the Sony E versions. Black Friday is close, so they may drop.

## Sigma 50-120mm vs the usual APS-C tele options

If you wanted f/2.8 at the long end on APS-C, the choice used to be the heavy Fuji zoom or a full-frame 70-180mm or 70-200mm on a crop body.

Table: Telephoto zooms for APS-C video, makers' specs and Europe prices

| Lens | Equivalent on APS-C | Aperture | Weight | Filter | From (Europe) |
|---|---|---|---|---|---|
| Sigma 50-120mm F2.8 DC OS | 75-180mm | f/2.8 | 390 g | 55 mm | €799 |
| Fujifilm XF 50-140mm F2.8 R LM OIS WR | 76-213mm | f/2.8 | 995 g | 72 mm | €1,359 |
| Tamron 70-180mm F2.8 Di III VC VXD G2 (Sony E) | 105-270mm | f/2.8 | 855 g | 67 mm | €1,199 |
| Sony FE 70-200mm F4 Macro G OSS II | 105-300mm | f/4 | 794 g | 72 mm | €1,519 |

The Sigma is less than half the weight of any of them and the cheapest. You give up reach: 120mm is short if you film wildlife or sport from the stands. The Tamron and Sony start at 70mm, which on a crop body is already a 105mm look, so they can't double as an interview lens across a small room the way 50mm can.

## Who should buy it, and who shouldn't?

Table: Is the Sigma 50-120mm right for your work?

| You shoot | Our pick | Why |
|---|---|---|
| Interviews and events on an FX30, A6700 or R7 | Sigma 50-120mm | 50mm for the wide interview angle, 120mm for the tight one, f/2.8 indoors, one light lens. |
| Run-and-gun travel on a ZV-E10 II or Canon R50 | Sigma 50-120mm | Lens OS matters on bodies without IBIS, and 390 g fits a small bag. |
| Product and food inserts | Sigma 50-120mm | 1:3 at 50mm from 23 cm. |
| Most of your work on a gimbal, zooming during takes | A prime, or an internal-zoom lens | The Sigma's barrel extends, so balance shifts as you zoom. |
| Wildlife, sport, plane spotting | Tamron 70-180mm or Sony 70-200mm f/4 | 120mm runs out of reach too soon. |
| Planning to move to full frame | Tamron 70-180mm G2 | It covers a full-frame sensor, so it moves with you. |

## Pros and cons for filmmakers

Table: Sigma 50-120mm F2.8 DC OS for video

| Good | Check first |
|---|---|
| Constant f/2.8 at 390 g and €799 | Barrel extends when zooming |
| Optical stabilisation, 6.5 stops at 50mm | Not on Sony's Breathing Compensation list |
| Linear AF motor and 11 rounded blades | No AF/MF or OS switch on the barrel |
| Aperture ring on the Sony and Fuji versions | No aperture scale on the RF version |
| Same 55 mm filters as the 18-50mm | No Nikon Z version, no published UK price yet |

If you're still choosing the body, our look at [Sony Monitor & Control on the A6700 and ZV-E10 II](https://www.4filmmakers.co/news/sony-monitor-control-a6700-zv-e10-ii/) covers what those two can do from a phone on set. On full frame, Sigma's other autumn launch is the 375 g [50mm F1.4 CL DG](https://www.4filmmakers.co/news/sigma-50mm-f1-4-cl-dg/), with its new RDD autofocus.

## Questions people ask

**Q: Is the Sigma 50-120mm f/2.8 good for video?**
On paper it suits video well: constant f/2.8, a linear AF motor, optical stabilisation and a design Sigma says keeps focus breathing low. Check the barrel extension if you use a gimbal, and note that Sony's Breathing Compensation doesn't support it.

**Q: Does the Sigma 50-120mm work with the Sony FX30?**
Yes, it's an E-mount APS-C lens, so it fits the FX30 without a crop. On that body it's about a 75-180mm equivalent. The FX30's Breathing Compensation won't work with it, as Sony's compatibility list only includes Sony lenses.

**Q: Is the Sigma 50-120mm internal zoom?**
No. Sigma's product photo at 120mm shows the inner barrel extended. Sigma gives one length, 99 mm, and no figure for the extended barrel.

**Q: What filter size does the Sigma 50-120mm use?**
55 mm, the same as the Sigma 18-50mm F2.8 DC DN. The 10-18mm F2.8 uses 67 mm.

**Q: Is there a Nikon Z version?**
Not yet. Sigma lists Sony E, Fujifilm X and Canon RF only.

## Sources

- Sigma, [launch announcement of the 50-120mm F2.8 DC OS | Contemporary](https://www.sigma-global.com/en/news/2026/10/08/012345/) (8 October 2026): release date, mounts, OS rating, focus breathing claim, removed switches
- Sigma, [50-120mm F2.8 DC OS product page](https://www.sigma-global.com/en/lenses/c026_50_120_28/): specs per mount, product photos of all three versions and the extended barrel
- Sigma product pages for the [10-18mm F2.8 DC DN](https://www.sigma-global.com/en/lenses/c023_10_18_28/) and [18-50mm F2.8 DC DN](https://www.sigma-global.com/en/lenses/c021_18_50_28/): filter sizes and weights
- Sony, [Breathing Compensation compatibility information](https://support.d-imaging.sony.co.jp/support/ilc/breathing/en/index.html), checked 3 November 2026
- Sony, [FE 70-200mm F4 Macro G OSS II specifications](https://www.sony.ca/en/lenses/products/sel70200g2/spec)
- [Fstoppers](https://fstoppers.com/gear/can-sigmas-50-120mm-f28-replace-fujifilms-pricey-telephoto-zoom-905002), hands-on with the Fujifilm X version and comparison with the XF 50-140mm
- [Calumet](https://www.calumet.de/magazin/sigma-50-120mm-f2-8-lichtstarkes-telezoom-fuer-aps-c) and [heise Preisvergleich](https://preisvergleich.heise.de/sigma-contemporary-50-120mm-2-8-dc-os-fuer-sony-e-694965-a3971952.html): Sigma 50-120mm prices and stock in Germany and Austria. All other Europe prices are the lowest listings on [heise Preisvergleich](https://preisvergleich.heise.de/). Both checked 3 November 2026
- [Fstoppers](https://fstoppers.com/gear/sigmas-799-50-120mm-f28-gives-aps-c-shooters-75-180mm-equivalent-telephoto-zoom-904973) and [Newsshooter](https://newsshooter.com/2026/10/08/sigma-50-120mm-f2-8-dc-os-contemporary/): US price and launch coverage
- Weights of the Fujifilm XF 50-140mm and Tamron 70-180mm G2 from the makers' published specs, as listed by [Photography Blog](https://www.photographyblog.com/reviews/fujifilm_xf_50_140mm_f2_8_r_lm_ois_wr_review/specifications) and [Adorama](https://www.adorama.com/tm70180g2soe.html)
- Cover and product photo: Sigma press images, graded by 4FILMMAKERS