Low Light DNG & JPEG

[SkySpy]

Greetings fellow pilots! I was experimenting with low light photography when I encountered something I did not expect. I have the DNG version named Tiff_0692 and the original jpg version (P6920692). I always shoot in Raw with a JPG twin on my SLR as I did here with the Anafi. My ISO was 800 and my shutter speed was 500. This should be enough speed on the shutter to give a reasonably sharp image considering the low light conditions. These images were shot with the wide angle setting. Notice how the DNG image is as should be expected for the given shutter speed. Now look at the JPG version. This images looks like it was taken at a much slower shutter speed. Note the double image in the bright outlines. I has always been my understanding that the JPG is a converted version of the DNG file. So why is there this visual difference? Most of the other images taken at this location show the same results.

 

[MustangPhil]

I am not sure to understand your problem (English is not my native language), but on the DNG image, you have the normal ‘fish-eye’ effect of the lens, and on the JPEG file, you have a flat horizon and cropped image due to the treatment to ‘flatten it’.
So your are not comparing ‘twin images’, but a Raw file vs a highly treated JPEG (‘DNG+Jpeg Rect’ in FF6 picture option)
If you really wanted to compare ‘twin’ images Raw vs JPEG, did you try to choose the ‘DNG+JPEG wide’ option ?