Quote:
Originally Posted by Graffy
Anyway, my question is: if I buy a simple chesire collimator along with a (separate) laser collimator (I'm thinking a Hotech), will that cover all my collimation needs?
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You do not need the laser. A cheshire/sight-tube will suffice.
Quote:
Originally Posted by Steffen
The Barlowed lasers don't just remove errors due to off-centre holding of the laser but also due to crooked focusers, drooping draw tubes etc.
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Bear in mind that barlowed laser can only be used to align the primary mirror.
Quote:
Originally Posted by Robh
It is impossible to achieve perfect collimation. The secondary mirror is approximately centred on the spider vanes and then as seen in the focuser draw tube. The secondary mirror minor axis is then roughly aligned at right angles to the focuser draw tube axis, which itself is roughly at right angles to the scope axis. Added to this, it is assumed the primary mirror is exactly centred to the scope tub
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It is possible to achieve perfect collimation. Collimation is about aligning optics. Whether the secondary mirror or the primary mirror are well-centered in the OTA or not is irrelavent.