Pebal

I used SNS-HDR to create this image. I modified only global parameters, I didn't use masking layers.

Both versions look bad. The Photoshop version look better, but not good. Also has a halo effects. The HDR algorithms should be changed. This is the HDR without the halo effect.

HDR technique is useful when you need to lighten the deep shadows. You can use one RAW file, but the gradients will be worse and the noise larger.

The number of photos depends on the scene, but you should not use the step greater than 2ev. The step 1ev is most often optimal.

I suggest sending a request to the Affinity team to change the HDR engine. I can help change this engine.