Dave,
Thanks for those links.
I had heard the term but failed to find an example. My solution in post #1 works well as long as there is enough light to see the cross hairs. These are exceedingly fine in the centre and it is highlighting these in total darkness that is my current challenge. My 35 exposure example was not tracked during exposure but each frame alinged before pressing the shutter. I am going to check out scopes with illuminating reticule as probably the cheapest solution for now.
Don
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