Hi Malcolm...I had read some reports in here about adding knobs, so I got a bit of a surprise when I unloaded the primary housing, to find six knobs on the underside of the mirror. Apparently my model is the "deluxe" version, it has 3 knobs for collimation and three to lock the setting. Another surprise was that the truss tubes were matte black instead of brushed aluminium....quite nice contrast to the white of the tube sections. Very pleased with it so far...
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