Meade Series 5000 ED APO - Adjustment of Crayford focuser for draw tube misalign
Posted 12 November 2007 - 01:40 AM
this weekend I purchased second hand a Series 5000 ED APO in mint condition but when i arrived home to further check it out i noticed that the draw tube, although very close to being flush, was not in line with the back of the crayford focuser.
I didn't think much of it, but later checked to see if the optics were collimated with a 2" laser collimator. The collimator was tight and flush up against the back of the draw tube. When i checked to see where the laser point was, it was off centre. It initially alarmed me thinking briefly it was the optics - then i remembered the issue with the draw tube.
I pushed in the draw tube flush against the crayford focuser and immediately noted it was dead center - meaning it was the issue with the drawtube and focuser.
I have noted tiny allen-key style screws at the top of the focuser. Are these used to adjust the internal assembly so that the draw tube can be aligned better?
We are talking about a 2 mm gap between the top and the bottom of the tube.
If I am correct - what precautions must I take with this adjustment process and how is it best done?
Thanks so much!
Revelstoke, British Columbia
Posted 12 November 2007 - 01:57 AM
Wouldn't you know it - it worked! Took 2 minutes. Checked with my laser collimator and it is perfectly aligned. Focuses really smooth now.
I have found no technical literature relating to this type of adjustment. I should do some shots and post on the internet.
Posted 12 November 2007 - 07:35 PM
Posted 17 November 2007 - 09:48 PM
I hope this helps.
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