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Don't worry for your english, mine is worse than your.
I have a Barlow 2x and I could use it. I know that installing the Barlow we change the focus point as it happens with the extender.
It is not clear to me how we can simplify the focus tuning. If you can try to explain me I shall appreciate very much. Teaoretically I should have studied also optical during the phisic couse at university but our professor did not like it and did not include in the program. So I am fully ignorant in optics.
Thanks
Ezio
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