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Thanks for the positive feedback everyone. Silly me forgot to mention that the lens that I was using is the 200mm prime. For the step down adapter I used a combination of two adapters to bring the 72mm down to 46mm which works well though I still get some star distortion in the very corners of the image. I recently found a 72mm to 37mm step down adapter on eBay which I am going to try to see if that improves things even more.
On the gradient there is possibly maybe a hint of gradient depending on the monitor and ambient lighting. I can't see it when looking at my monitor at work but could see maybe a tiny hint on my monitor at home. For now I am resisting any urges to fiddle with this anymore. My subs did finish up with more gradient than expected which is maybe because I was starting the image capture a little early whilst the object was at about 30d elevation.
Thanks again all.
R
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