The GFX 50 Series is an ISO-less Classic

The sensor in the GFX 50 series is certainly not the fastest. Nevertheless, you should not underestimate this ISO-invariant classic with its 50 megapixels. In terms of sharpness and dynamic range, it can still hold a candle to newer developments.

by Rico Pfirstinger

Virtually all cameras of the Fujifilm X series are ISO-less (also known as ISO-invariant). This refers to cameras with sensors for which the ISO setting doesn’t matter in terms of image quality. Only the set aperture and exposure time (shutter speed) are decisive. It’s all about the actual amount of light that reaches the sensor. I have written about this before (German version, English version).

Is My Camera ISO-less?

You can find out yourself to what extent the sensor in your camera is ISO-less. Here’s an example with a GFX 50S: I first shot a consistently lit test subject at f/13, 1/50 sec. and ISO 1600. The result was a correctly exposed image. I then shot the same subject again at aperture 13 and 1/50 sec., but this time I reset the ISO to ISO 100. This is the base ISO value of the GFX 50 series, i.e. its baseline sensitivity. Of course, the second image appears four stops darker. After all, it was taken at an ISO setting that was four stops lower than the first shot, with otherwise the same exposure. To make our second image (captured at ISO 100) appear as bright as the first, we need to boost it four stops in the RAW converter (in our case, that’s Adobe Lightroom). This we do by moving the converter’s exposure slider 4 EV to the right from its zero position.

The same subject shot twice with f/13 and 1/50 sec. – on the left with ISO 1600, on the right with ISO 100 and a subsequent brightening in the RAW converter by 4 EV.

Please click on the image for a larger version.

To better assess whether the GFX 50S used in this example really works ISO-less, let’s take a closer look at enlarged details of the two test shots:

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Fujifilm X-T3 vs Sony A7III, Nikon Z7, Canon EOSR Video Autofocus and High ISO Comparison

Max Yuryev compared the high ISO and video autofocus performance of the Fujifilm X-T3, Sony A7III, Canon EOS R, Nikon Z7.

Are you ready? Then check out the videos down below.

Fujifilm X-T3: BHphoto, AmazonUS, Adorama, Focuscamera

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CONTINUOUS VIDEO AUTOFOCUS

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Photons to Photos: Special Edition Chart for Fujifilm X-T3 Dynamic Range Test Electronic vs Mechanical Shutter

Fujifilm X-T3 Dynamic Range

Photons to Photos just published a special edition Fujifilm X-T3 photographic dynamic range (PDR), where you can compare various Fujifilm X-T3 bit depths. You can manipulate the data here. Data in tabular form is below.

For the regular edition Photographic Dynamic Range chart click here.

Fujifilm X-T3: BHphoto, AmazonUS, Adorama, Focuscamera

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Photons to Photos Fujifilm X-T100 Dynamic Range Test Results Slightly Worse Than X-Trans Fujifilm X-T3

Photons to Photos sensor tests, show that in terms of dynamic range, Fujifilm’s latest Bayer sensor camera, the Fujifilm X-T100, performs slightly worse than X-Trans cameras like the Fujifilm X-T3 and Fujifilm X-T2.

You can check out the data here.

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Fujifilm X-T3 + v. grip (save $130): BHphoto, AmazonUS, Adorama, Focuscamera
Fujifilm X-T3 + 18-55 + v. grip (save $130): BHphoto, AmazonUS, Adorama, Focuscamera
Fujifilm X-T2 (save $500): BHphoto, AmazonUS, Adorama, Focuscamera
Fujifilm X-T2 + 18-55 (save $400): BHphoto, AmazonUS, Adorama, Focuscamera
Fujifilm X-T100 (save $100): BHphoto, AmazonUS, Adorama, Focuscamera
Fujifilm X-T100 + XC15-45 (save $100): BHphoto, AmazonUS, Adorama, Focuscamera
Fujifilm X-T100 + XC50-230 (save $100): BHphoto, AmazonUS, Adorama, Focuscamera

Fujifilm X-T3 vs Sony A7III Video High ISO and Exposure Recovery Tests

Fujifilm X-T3 vs Sony A7III

The Fujifilm X-T3 has great video specs, that put it at the very top of the mirrorless cameras for shooting videos.

And also when it comes to dynamic range and high ISO, the Fujifilm X-T3 performs admirably. In fact, the Fujifilm X-T3 has better dynamic range when shooting video than the full frame Sony A7sII, as Cinema5D measured here.

Also, as video-guy Jordan from DPRTV said in the X-T3 review we shared here, that the X-T3 colors and skin tones are just something easy to fall in love with.

Now also LensProToGo published his Fujifilm X-T3 video high ISO and video exposure recovery tests. You can see it down below.

I have also added the same test he did for the Sony A7III, so you guys can compare them. Overall, the Fujifilm X-T3 keeps up greatly against its full frame competitor.

You can read his findings and see all 3 videos down below.

Fujifilm X-T3: BHphoto, AmazonUS, Adorama, Focuscamera

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Video Performance Comparison

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