Quote:
Originally Posted by DavidU
A laser is good for collimating the focuser. Just remove the lens cell and replace it with a round piece of white paper with the exact centre marked, so if the focuser is spot on the laser will be dead centre .Make sure the laser itself is collimated (turn it around when in the focuser).
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I understand that great care must be taken when removing the lens cell as the obejctives components can move if this is not done right.
In case you have not found it here are the 127 ED's instructions:
http://explorescientific.com/telesco...mm_ed_apo.html
(slightly different model - with reversable dew shield but think the reast is the same). BTW can anyone confirm the correct way to remove the dew shild from the NG model - I assume the coloured ring unscrews? Seems very tight on mine...