Yes that field curvature needs to be reigned in a little. The metal back distance is pretty critical so I would suggest finding out the metal back distance and then work that to the sensor. Precision Parts in the US will be able to knock up an adapter which will be as tight a tolerance as you need.
As to the image I like the contrast and the smoothness of the image. I don't think you have indicated how many subs you used here. Looks to be a few though. What temp? Looking forward to more.
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