Thanks for the advice Greg. The difference in focus between in and out is a travel of 1-1.5mm. The action takes place completely within the borders of the infinity mark! The ring is fairly stiff and I could of taken a longer time fiddling to get it right but i was getting ready to go to work. I'm also thinking of making a Bhatinov mask and using this with the 8X zoom to get as close to focus as possible.
all the best
Paul
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