jw432

For an x-e3 which attribute contains the shutter actuation count?  This website tells me https://www.apotelyt.com/camera-exif/fujifilm-shutter-count a number but I cannot find that number in the Exif data.  I am simply trying to verify the value by looking at the source, not necessarily trusting a website.
thx in advanced.

Rico Pfirstinger wrote some books on Fuji X-cameras incl. a few pages on DR. It's in all of his X-pert Tips books. Furthermore, cambridgeincolour.com has extensive explanation pages on all sorts of photographic topics. Just search on their site for dynamic range. The key is that you cannot correct blown-out highlights but it is easy to correct deep shadows in post processing. Cameras have two ways of addressing this: either an HDR-feature or an extended DR feature. 
The extended DR-setting on the camera works for jpegs. It typically underexposes your raw file by 1 or 2 stops and than with the in-camera raw conversion to jpeg it leaves the highlights as is and amplifies only the midtones and shadows to produce a jpeg with detailed highlights (because under exposed) and nice blacks and greys (corrected in camera). Effectively its 1 extra stop of DR in practice.
The HDR feature actually creates multiple images with an exposure bracket and combines these images into one, using the highlights of the underexposed image and the shadows and midtones of the other images. HDR can also be used for raw images in post.
As for your typical situation, you only use raw-files and no jpeg I believe. Best approach IMO is to leave the DR setting to 100% and do the exposure correction in Affinity Photo. In order to do that you should set the live view function on to see the effect of the exposure on screen and switch on the histogram. Than set the exposure in such a way that the highlights (right part of the histogram) do not blow out. So stay within the border of the histogram at the right. The shadows might get blocked and the midtones way darker than you want, but that is easily corrected in post with the Shadow and Midtone sliders.
By using this method you can use the base ISO of the camera (ISO100 in case of the GFX50R) which is always preferable in landscape photography. The fact that below ISO320 the camera limits you to DR 200% is because it needs 'room' to do the corrections.  From 320 to 2 stops down is ISO80 which the camera cannot handle (ISO100 is the lowest) without trics like extended low ISO which you should only use as a last resort. 

Though I don't use Affinity Photo and I therefore can't check it, it is most likely caused by the Dynamic Range setting. By setting DR to 400% you're essentially underexposing by 2 stops. I know that Capture One reads the RAF-file and adjusts accordingly. It's very likely that Affinity doesn't do that. Whether it's for all Fujifilm cameras or only for this one (GFX50R?), I can't tell. RAF-files from the GFX cameras are different from the X-Trans cameras. Even between the different models there are variations, hence that software specifies not the sensor type/generation but specifically the camera model. 

Prof. Taylor has awesome images on his Flickr.

Looking for folks who enjoy light painting with their Fuji cameras.
Been having some fun the last few years and looking to find others who enjoy this type of photography.
Opera Glasses by Wes Taylor, on Flickr
 

This stores the value you entered into the EXIF data. That can be useful if at some point in the future you want to remind yourself which focal length (lens) you used to get that image. Additionally, if your raw converter allows you to use custom lens profiles during the conversion process, this information already being in the data can save you some time by selecting the appropriate one for you. The lens profile can contain information regarding how much vignetting the lens has for a given f-stop, how flat or fish-eyed a lens is, etc. Many raw converters have some generic profiles they use for lens that cover a wide variety of settings. 
It does no harm to leave it empty, filling it in and remembering to use may give you some extra options.