One of the first things that I hoped to accomplish after buying a Fujifilm GFX100S II camera last month is to understand how compatible X-series Film Simulation Recipes are with GFX, and what adjustments should be made, if any. I had anticipated this being a fairly easy task, and in a sense it was, but I really struggled with this project.
Fujifilm has made a number of GFX models since February of 2017: GFX50S, GFX50R, GFX100, GFX100S, GFX50S II, GFX100 II, and GFX100S II. There are a few different sensors and processors, and the cameras can be separated into different generations. The GFX50S, GFX50R and GFX50S II share the same sensor, but the GFX50S II falls into a different generation than the original two. The GFX100 and GFX100S share the same sensor, but are different generations. The GFX100 II and GFX100S II share the same sensor, but not the same sensor as the first two 100mp GFX models. It’s a bit of a puzzle. The only GFX camera that I own is the GFX100S II, and I briefly had the opportunity to borrow a GFX50S four years ago. My GFX experience is very limited at this point.
One issue that I found when comparing Recipes captured on X-Trans vs GFX is that the lenses are not the same. Different lenses can produce slightly different results depending on the micro-contrast and coatings. While not a big deal, it would have been preferable to have used the same lens across all the tests; however, even if I could, the focal length wouldn’t be the same. For example, when I adapt my vintage Helios 44-2 lens, the focal length on X-Trans is 87mm while it is 46mm on GFX; aside from that, the Helios is noticeably softer on the GFX. So the comparisons I made were never fully 1:1, unfortunately.
I did make a number of comparisons between the photos captured with the GFX100S II and those made on an X-T5 and X-E4, utilizing the same Recipes. The main difference between X-Trans IV and X-Trans V rendering is that blue is a little deeper on X-Trans V with the Classic Chrome, Classic Negative, Eterna, and Eterna Bleach Bypass film simulations—there are some other minor differences, but the blue rendering is the main one. On the GFX100S II, blue behaves more like X-Trans V. The overall rendering is very similar to X-Trans V, but not 100% identical. For example, Grain is scaled differently on GFX. There are several insignificant differences that I noticed upon close side-by-side comparisons, but without carefully studying deep crops, the GFX images look pretty identical to the X-Trans V photos. Except they also don’t.
This is the paradox I discovered: the pictures look so similar when comparing colors, tints, shadows, etc., etc., but there is something that’s clearly different. But what? I couldn’t put my finger on it.
I asked a few people I know who have a GFX camera, and one suggested color fidelity, that the same exact colors just seem more alive (or maybe more lifelike) on GFX. My wife, Amanda, suggested that it’s depth, that it feels like you can step into the GFX photos, while the X-series photos seem a little flat in comparison. This could simply be the depth-of-field or the micro-contrast of the GFX lenses (or both). As I thought about it, I was reminded of the Sigma DP2 Merrill camera I used to own that similarly had a (so-called) “3D pop” to the pictures. High-ISO digital noise looks different on GFX, with splotchy colors that are typical from a Bayer sensor (and not the more film-grain-like noise from X-Trans); however, it’s not particularly obvious, buried in all that resolution. It’s probably a combination of all of those things and more that make the nearly identical colors and contrast appear different in a way that is difficult to describe, but it’s all so subtle that it’s easy to miss and dismiss, so perhaps it doesn’t matter.
With that information, I made a decision regarding Film Simulation Recipes in the Fuji X Weekly App. I added the GFX100 II and GFX100S II as compatible cameras to all X-Trans V Recipes, as well as X-Trans IV Recipes (excluding those for the X-T3/X-T30) that don’t use Classic Chrome, Classic Negative, Eterna or Eterna Bleach Bypass (the same Recipes as the X-T5, for example). Use those Recipes on the GFX100 II and GFX100S II, as they look great. I updated the App yesterday to show those Recipes as compatible with those two cameras. For the other (non-X-T3/X-T30) X-Trans IV Recipes, dropping Color Chrome FX Blue down one spot (Weak instead of Strong, Off instead of Weak) also makes them compatible.
After that, I thought about the other GFX models. Shouldn’t they be in the App, too? Why should they be left out? I don’t own any of those other GFX models, so I dug through the manuals—plus did several Google searches—to try to piece together how they should be categorized in the Fuji X Weekly App. That took a few verified and unverified assumptions. Also, I realized an assumption I made several years back was incorrect.
I categorized GFX100S the same as the newer X-Trans IV cameras; Recipes that are compatible with (for example) the X-T4 are also compatible with the GFX100S. I categorized the GFX100 the same as the X-T3 and X-T30.
The 50mp GFX cameras are a bit of a problem because shadows are rendered slightly lighter, and a .5 Shadow increase is necessary for those models (the GFX50S and GFX50R don’t have .5 Highlight and Shadow adjustments). A few years ago when I had the GFX50S for a few weeks, I created three Recipes for 50mp GFX. I made an assumption that those Recipes would also be compatible with the GFX100, but I believe that camera has deeper shadow rendering like the other 100mp cameras, so that assumption was incorrect; however, I left it alone in the App. If not for the shadow rendering, X-T3/X-T30 Recipes would be compatible with the GFX50S and GFX50R—you can still use those Recipes, just know that it will look slightly different (try them anyway, you might like the results). The one camera that was left out of the App is the GFX50S II. You can use X-Trans IV Recipes the same as the GFX100S; however, a .5 Shadow adjustment should be made. If a Recipe calls for -1 Shadow, use -0.5 instead, and if a Recipe calls for +2 Shadow, use +2.5 instead.
This isn’t a perfect categorization of the GFX models, but I think it’s good. If I made a mistake in this, please let me know—like I said, my GFX experience is quite limited. For those with GFX cameras, I hope this provides a little clarity as to which Recipes to use. I’m sure that having these cameras in the App will be helpful to some photographers with GFX models, so if you have a GFX camera, open up the Fuji X Weekly App and take a look.
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See also: 10 Frames in New Mexico — Fujifilm GFX100S II XPan Photographs