Thanks Dave!
I forgot to mention this image was captured before dark and that may very well present part of my problem. It was intended for calibration purposes initially.
Tonight after dark I played with my little Megrez and poked the 5 times powermate into my self designed adapter. That's when I learnt I can't stack Nikon RAW (.NEF) images. There's a reason I wanted RAW and not JPG, oh well, I'll just do two RAW frames (converted to .tif) stitched in MS ICE and see how it looks.
It won't be at 5 times, plus I used my D810. I remember reading by varying the position of the Powermate I could vary the magnification with the 5 times. I've forgotten what I read but I'll be designing a new purpose made adaptor which will be adjustable soon when I can get the alloy to turn up on the lathe (and a boring bar, I don't seem to have one).
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