I've been using Formatt-Hitech Firecrest filters for a while now for my landscape photography, and I absolutely love the system. I've used it exclusively on my D810 until now and have never had any issues to date. This morning I tried it for the first time on my Fuji X-T20 and ran into a major issue that I can't seem to diagnose on my own. I was out shooting this foggy scene just before sunrise: 1.) This photo is taken with the CPL filter only. Diagnoses_Grad-2 by Destin Danser, on Flickr I noted that the sky was significantly brighter than the foreground so I added a 0.6 reverse grad ND filter for the next shot (only grad filter I had with me) 2.) This was the result with the grad on. Same exposure settings. Same while balance. Same everything, other than the filter. Diagnoses_Grad-1 by Destin Danser, on Flickr Both images are SOOC jpegs with no editing applied. Raw files appear similar, so it isn't a problem with the jpeg engine. I've never noticed a color cast with this filter and I've used it a bunch of times. This was the first time using it on an x-trans sensor though.. could it somehow just not work well with that sensor format or something? Or is it just way too strong of a filter for this scene and the severe underexposure is revealing a cast?