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Yes – adding a Barlow increases the challenge exponentially!
I have a 9x50 finder which has a small circle where the cross hairs meet in the middle of the illuminated reticule. This allows me to place the object dead centre of the cross hairs without the cross hairs occulting the planet or star.
For prime focus and x2 to x3 Barlow’s this is a reasonably accurate and reliable operation, but at x5 it is quite frustrating and I centre the object through trial and error.
Cheers
Dennis
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