Thanks Raymo,
The distance between the chrome plated bit of 'A' through to the lip is about 50mm. I think I tried the other night with just 'B' screwed into the focuser but I'll try that and see what happens - I'm pretty sure that was the way I had it to get it to focus at all the way in.
Thanks for all the advise and help too, appreciate it.
Also I'm using a Canon 5D mkiii.
Andreas
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