Is Fuji GFX 50r ISO-less?

Pretty much what the title says... I've searched and searched the reviews and nobody seems to mention this clearly. Would appreciate the input.

I do not have a 50r, but you could probably infer the effect of ISO on the raw file from the raw test shots on the imaging resource review for the 50r. They have raw and JPEG for each ISO-if it is effectively ISO-less up to 800, for example, when they bump up the ISO and dial back the shutter speed to preserve JPEG exposure, the JPEGs for each ISO level will look similar, but the raw files will become progressively underexposed as ISO increases (because the shutter speed keeps getting dropped one EV as ISO is increased one EV). You would need to inspect the raw files with raw digger or similar utility that will show you the raw histogram.

Kirk

Sutter speed is independent of the ISO irrelevant sensor with Fuji, the sensor info is only amplified after exposure not during. Is you select 1/2000 then that is what you'll have no matter what ISO setting you dial in.

My point was to differentiate between exposure of the sensor (aperture+shutter) and the effect ISO has on the raw file. When imaging resource shoots their studio sequence, they include ISO in their exposure (ie, so that JPEGs appear the same across the ISO sequence). If one is going to use their raw file samples to examine the effect of ISO on the raw files, then one needs to account for this in terms of how they adjust SS to offset ISO for the JPEG “exposure.”

Obviously, it would be a lot easier to shoot a sequence with a 50r where you set the exposure at base ISO and simply shoot the sequence by changing ISO. The JPEGs will appear progressively brighter, but the raw file will not change,in theory, for an ISOless sensor, up to, say 800, for example. But we don’t have a 50r, so I figured we could deduce something from IR sample raws, but with the caveat that you would have to account for their SS change that they introduce to offset ISO for JPEG exposure.

Kirk

kirkt wrote in post #18837945
My point was to differentiate between exposure of the sensor (aperture+shutter) and the effect ISO has on the raw file. When imaging resource shoots their studio sequence, they include ISO in their exposure (ie, so that JPEGs appear the same across the ISO sequence). If one is going to use their raw file samples to examine the effect of ISO on the raw files, then one needs to account for this in terms of how they adjust SS to offset ISO for the JPEG “exposure.”

Obviously, it would be a lot easier to shoot a sequence with a 50r where you set the exposure at base ISO and simply shoot the sequence by changing ISO. The JPEGs will appear progressively brighter, but the raw file will not change,in theory, for an ISOless sensor, up to, say 800, for example. But we don’t have a 50r, so I figured we could deduce something from IR sample raws, but with the caveat that you would have to account for their SS change that they introduce to offset ISO for JPEG exposure.

Kirk

Yea you're post makes more sense now

Although, the raw file on output will be exposed as per the settings, regardless of what ISO you use, not underexposed unless you have DR set to Auto or 400 etc..[with Fuji], as will the jpeg. There is no underexposure on output of the raw file, it looks just like it should.

Although the sensor in the GFX is the same as the Pentax 645 and X1D & H6D 50c the other hardware and software is different. So you can take advantage of the ISO irrelevant set up there.