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A bit more progress, installed a light shield around the upper section made from 0.5mm al sheet, attached the spider vanes, and glued together the secondary assembly.
I'm now wondering about secondary offset, is it needed? and if so how should I do it? I did some quick calcs and I think the offset is around 4.5mm, does that sound right?
The next stage is building a heavy duty focuser, any ideas on a good design?
Cheers
Jo
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