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Another user posted an example a few years back showing how DNG files created by CHDK exhibit a large amount of dead/bad/stuck pixels when developed in Affinity Photo (as opposed to in-camera conversion or developing in Lightroom/ACR). As I have a number of such files from my CHDK camera, I tried it out with the current version 1.8.x and the issue still exists.
As far as I've found, support for the full DNG 1.3 specification is rare and a few years back only Adobe products could handle these files correctly. These days at least RawTherapee seems to handle these files correctly as well (it used to require applying a dead pixel filter which guessed the location of bad pixels, but doesn't anymore, these files are now developed correctly without adding the dead pixel filter).
As Affinity Photo supports lens distortion correction for many CHDK cameras, it would be very nice to have support for the "badpixel opcodes" as well.

I have found that Affinity Photo, both stable (1.8.5) and current beta (1.9.0), can not process RW2 files from Panasonic Lumix DMC-FZ80/82 with lens correction. The RW2 files produced by this and many other Panasonic cameras contain a built-in lens correction profile for fixing distortion and chromatic aberration. The only programs I have found that are able to use this information is Adobe Lightroom (and related Adobe products like ACR) and SilkyPix, both of which do not seem to have any pre-made profiles for this camera but rather uses the parameters from the lens correction metadata to create a correction on the fly (Adobe Lightroom in particular specifically tells me this when doing lens correction on the file). In my testing of Affinity Photo's processing of these files, I have found that choosing the "Panasonic Lumix DMC-FZ45 and compatibles" profile manually, as suggested by some for mostly any Lumix FZ model does not yield a satisfactory result, with very visible distortion remaining whichever way I tweak the correction, and doing a completely manual correction also leaves a lot of visible distortion that doesn't seem to be possible to accurately compensate for without using the specific correction data embedded in the RW2 file EXIF metadata.
I've found a page that details this metadata and how it is most likely used by the programs that can use it: https://syscall.eu/#pana
Some other manufacturers beside Panasonic, such as Sony, also embed lens correction profiles in their RAW files these days, so having Affinity support embedded profiles would probably be a very useful improvement and would lessen the dependence on the Lensfun library.

In no particular order:
Bug fixes Develop persona: Batch processing and non-destructive RAW development (sidecar files) Develop persona: Eyedropper for white balance Develop persona: Support for CHDK DNG opcodes / dead pixel interpolation Develop persona: Wider parameter range for adjustments that are limited to 25% or 50% today (saturation, for example) Develop persona: Better support for OnePlus DNG files (currently they always get a green tint and almost no saturation whatsoever - Lightroom handles them correctly in these regards) and other RAW/DNG files that have similar problems in Affinity today Photo persona: Numeric parameters in Curves Photo persona: Eyedroppers for whitepoint, blackpoint and graypoint in Levels and Curves Photo persona: Numeric parameters in auto adjustments (auto color, auto contrast, auto levels etc) Photo persona: Both Fill and Opacity parameters like in Photoshop, especially for "special" blend modes like Hard Mix - and fix the wording in the Layer Effects window that says "Fill opacity" - it's just regular opacity, same as the one in the layers list. Photo and Develop persona: Crop tool extended with "Crop to bounds" and "Crop to opaque" like in Panorama mode Any slider, particularly in Develop and Tonemapping personas: Doubleclick to reset slider to zero/default.

In no particular order:
Bug fixes Develop persona: Batch processing and non-destructive RAW development (sidecar files) Develop persona: Eyedropper for white balance Develop persona: Support for CHDK DNG opcodes / dead pixel interpolation Develop persona: Wider parameter range for adjustments that are limited to 25% or 50% today (saturation, for example) Develop persona: Better support for OnePlus DNG files (currently they always get a green tint and almost no saturation whatsoever - Lightroom handles them correctly in these regards) and other RAW/DNG files that have similar problems in Affinity today Photo persona: Numeric parameters in Curves Photo persona: Eyedroppers for whitepoint, blackpoint and graypoint in Levels and Curves Photo persona: Numeric parameters in auto adjustments (auto color, auto contrast, auto levels etc) Photo persona: Both Fill and Opacity parameters like in Photoshop, especially for "special" blend modes like Hard Mix - and fix the wording in the Layer Effects window that says "Fill opacity" - it's just regular opacity, same as the one in the layers list. Photo and Develop persona: Crop tool extended with "Crop to bounds" and "Crop to opaque" like in Panorama mode Any slider, particularly in Develop and Tonemapping personas: Doubleclick to reset slider to zero/default.

In no particular order:
Bug fixes Develop persona: Batch processing and non-destructive RAW development (sidecar files) Develop persona: Eyedropper for white balance Develop persona: Support for CHDK DNG opcodes / dead pixel interpolation Develop persona: Wider parameter range for adjustments that are limited to 25% or 50% today (saturation, for example) Develop persona: Better support for OnePlus DNG files (currently they always get a green tint and almost no saturation whatsoever - Lightroom handles them correctly in these regards) and other RAW/DNG files that have similar problems in Affinity today Photo persona: Numeric parameters in Curves Photo persona: Eyedroppers for whitepoint, blackpoint and graypoint in Levels and Curves Photo persona: Numeric parameters in auto adjustments (auto color, auto contrast, auto levels etc) Photo persona: Both Fill and Opacity parameters like in Photoshop, especially for "special" blend modes like Hard Mix - and fix the wording in the Layer Effects window that says "Fill opacity" - it's just regular opacity, same as the one in the layers list. Photo and Develop persona: Crop tool extended with "Crop to bounds" and "Crop to opaque" like in Panorama mode Any slider, particularly in Develop and Tonemapping personas: Doubleclick to reset slider to zero/default.

In no particular order:
Bug fixes Develop persona: Batch processing and non-destructive RAW development (sidecar files) Develop persona: Eyedropper for white balance Develop persona: Support for CHDK DNG opcodes / dead pixel interpolation Develop persona: Wider parameter range for adjustments that are limited to 25% or 50% today (saturation, for example) Develop persona: Better support for OnePlus DNG files (currently they always get a green tint and almost no saturation whatsoever - Lightroom handles them correctly in these regards) and other RAW/DNG files that have similar problems in Affinity today Photo persona: Numeric parameters in Curves Photo persona: Eyedroppers for whitepoint, blackpoint and graypoint in Levels and Curves Photo persona: Numeric parameters in auto adjustments (auto color, auto contrast, auto levels etc) Photo persona: Both Fill and Opacity parameters like in Photoshop, especially for "special" blend modes like Hard Mix - and fix the wording in the Layer Effects window that says "Fill opacity" - it's just regular opacity, same as the one in the layers list. Photo and Develop persona: Crop tool extended with "Crop to bounds" and "Crop to opaque" like in Panorama mode Any slider, particularly in Develop and Tonemapping personas: Doubleclick to reset slider to zero/default.

Hello.
I've been using Photo for quite a while now on iPad and have just purchased the Mac version.
So far a great app, but there is one major (at least for me) feature missing – the fill slider for layers, like in Photoshop.
I use fill far more often than opacity in Photoshop, because the way blend modes and effects interact with the background better suits my editing style and requirements.
Here's an example of the different ways blending is handled when using fill vs. opacity:

 
I don't seem to be able to replicate that effect or behavior in Affinity Photo by any means.
Please implement this functionality in Photo for both Desktop and iPad.
Thank you!
Michael