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That is deep Scott to show the faint dust. You may do better if you put an aperture inside the lens hood. This has two effects it cuts off the outer part of the lens where the aberrations are greatest and stops any light not contributing to the image from scattering inside the lens. You do lose speed but the contrast goes up. I have used an 84mm diameter(f/3.5) and 56mm diameter (f/5) on my 300mm lens and the improvement was remarkable. The stars were pinpoint corner to corner and the images could also be stretched more as the contrast is far better. In fact the faint nebula data was better due to the increased contrast. Sky glow also seemed to be far less.
It is emotionally difficult to stop down a 104mm diameter clear aperture lens to something smaller but the gains far outweigh the losses.
I predict you will get even better images than the great ones you are getting now with your 300mm lens.
Bert
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