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Hi Manfred, excellent shots! I recently tried
a Visac as well and I found it quite sensitive to the wind. 1800 mm of FL are
quite a lot. Amazing you get such an high traking quality with a GPDX.
You must be really protected from the wind, aren't you? Do you always guide off
axes or do you use also a guidescope at f/9?
Ciao
Marco
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