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Panasonic GH5 and Metabones Speedbooster XL 0.64x tested with Sigma 18-35mm f1.8

Reviews posted on 6th Feb 2017 1:09am by Dan Chung 10 Comments

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Following on from my tests last week with the pre-production GH5 and Metabones Speedbooster XL, I’ve done a few more, but this time with the popular Sigma 18-35mm f1.8 lens. The usual caveats apply – because the camera is pre-production things might change with the final version of the camera.

The earlier test shot with Kaiman Wong proved that a full-frame lens like the Xeen 50mm I used will work with the Speedbooster XL, but what about lenses designed for Super35 or APS-C sensors? Because these are not intended to cover a 1.3x crop in a lot of cases they will show black edges. Some are however known to have slightly larger imaging circles that could cover the 1.3x area – at least in 16×9 format.

The most obvious of these is the popular Sigma 18-35mm f1.8. Above is a quick test of the Metabones Speedbooster XL 0.64x and a Sigma 18-35mm lens working on the Panasonic GH5 in UHD mode. You can see that the lens and adapter appear to cover the sensor quite well. The test was not without issues though. The Speedbooster XL with any electronic Canon lens locked up the GH5 when mounted. The only way to make this test was to disconnect the lens slightly from the Speedbooster so that the two were not in contact. A Genus variable ND filter was used to control exposure. This was clearly a firmware issue and I’ve had unconfirmed reports that the latest version of the GH5 firmware does not lock up the camera. Again, more testing needs to be done but it looks promising and Sigma 18-35mm owners look like they are in luck.

To demonstrate the difference in crop between the GH5 with Speedbooster XL and a Super35 camera I shot the pictures below. They are from the same spot with the same Sigma 18-35mm lens with a Speedboosted GH5 and a Sony a6500 with Sigma MC-11 adapter. You can see that the Speedboosted GH5 image has a wider field of view. Of course I could attach a Speedbooster to the a6500 as well, but the point is to show the comparative size of the GH5/Speedbooster image.

Panasonic GH5 with Metabones Speedbooster XL 0.64x and Sigma 18-35mm f1.8 at 18mm. UHD mode.

Sony a6500 with Sigma 18-35mm f1.8 and MC-11 adapter at 18mm. UHD mode.

The previous tests were done with the in-body stabilisation turned off. That’s because I was concerned that if the sensor shifted around during a shot that you may see the edges of it as black corners when using the Speedbooster XL. For the next test I turned this stabilisation back on and panned the camera quickly from left to right to see if I could get these black corners to show up.

To my surprise they did not seem evident but of course more testing needs to be done. Next time I will move the camera around a lot more and try different lens combinations. Again, it looks promising though, especially for run-and-gun shooters. Also impressive in that last test video was the rolling shutter, which seems incredibly well controlled. Being a small sensor it does have an advantage, but it very good none the less.

Tech notes:
All footage was shot in 4K/25P and 150Mbps and recorded internally to SD card. The camera is a pre-production sample and image quality should not be taken as final. The camera did not have V-Log L installed so it was set to Cinelike D. ISO was 200 and the footage is straight out of the camera and ungraded.

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About Dan Chung

Co-founder of Newsshooter, Dan Chung has over 20 years of experience working behind a camera. His career started in photography but evolved into documentary, multimedia and broadcast TV. He shot the first news video on a DSLR and has been on staff at Reuters, The Guardian and CNBC. Dan heads up the editorial team at www.photogearnews.com.

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  • ValyrianSteel

    Is Kaiman Wong moved to the UK now?

  • Visar Sulejmani

    Thanks a lot guys. Really informative stuff.

  • The Dude

    Someone needs to get some voigtlanders on that bitch!

  • vincent_rice

    the 0.71 Speedbooster is the one for the Sigma APSC lenses surely? That combo should be golden. The rolling shutter, or rather lack of it, has made my 6500 burst into tears.

    • Newsshooter

      The reason people want the 0.64x to work is the get an even larger sensor look than S35. That and a lot of GH4 owners already have the 0,64x. I actually have both and if all you want to do is replicated a s35 look then the 0.71x should be fine on the GH5

      • Christian DaCosta

        What is the focal length equivalent on the GH5 with the 0.64x and 0.71x while using the sigma 18-35?

        • vincent_rice

          approx 26mm to 49mm FF equivalent. Almost exactly the same as on an Sony APS-C sensor.

  • kenyee

    looking forward to the heavier IS test….did you leave a gap when disconnecting the lens electronics?

  • http://www.lionbrand.com/yarns/vannaschoice.html Larry Templeton

    Nice test. I seem to be able to work around rolling shutter without a lot of problems, but the GH5 is pretty darn impressive. It looks as good (or maybe slightly better) than an FS7/F5.

    FWIW, I sometimes put the Metabones EF to E speed booster on my a6300, and in 4K 30p (when the a6300/6500 crops in on the sensor) the full 18-35mm range looks good, no vignetting, etc.

    From 30mm to 35mm, I consider the Sigma 18-35mm a “full frame” lens. With some vignetting it covers a FF sensor starting around 26mm.

  • Jason Hylton

    Some filmmakers use a BMPCC speedbooster on a GH4 to make the field of view even wider. Would such a setup work with the GH5? Would the BMPCC speedboster affect the image stabilization in some way? Thanks!

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