Daz Type-R Posted May 3, 2014 Share Posted May 3, 2014 Ok, so the secondary mirror and veins have been removed so I could collimate the focuser again after removing a 0.5" riser, that's fine, put the secondary back in and due to my Baz's knobs on the back of the secondary I can't get a 6" ruler to fit to make sure the secondary holder is central to the OTA. So I used a 6cm protractor to measure from the inside edge of the OTA to the central stalk that holds the secondary mirror. These 4 measurements are identical (or as near as), my question, is this a correct part to measure against? I ask, as when looking through the Cheshire the cross hairs are not on the donut and the secondary is off, by a lot. Thought I would ask before I start messing about with the secondary mirror screw and collimating knobs. If my initial measurements are wrong, everything I do going forward will be incorrect. Cheers all. Link to comment Share on other sites More sharing options...
Perkil8r Posted May 3, 2014 Share Posted May 3, 2014 Sounds right to me. Link to comment Share on other sites More sharing options...
+DaveJW Posted May 3, 2014 Share Posted May 3, 2014 And to me too. Link to comment Share on other sites More sharing options...
+Graham Posted May 3, 2014 Share Posted May 3, 2014 and me Link to comment Share on other sites More sharing options...
BAZ Posted May 4, 2014 Share Posted May 4, 2014 Me too! Link to comment Share on other sites More sharing options...
Daz Type-R Posted May 4, 2014 Author Share Posted May 4, 2014 Cheers guys, I will start fiddling with the secondary again then. Cheers. Link to comment Share on other sites More sharing options...
Guest MichaelDurban Posted September 15, 2014 Share Posted September 15, 2014 me too !!!!! I have done this too... I used a calliper to measure from the inside OTA to the centre of the phillips screw.. (only because a calliper has a nice sharp edge). Just..for the love of... don't overtighten the screws when tightening the spider..I used washers in between the screw and the OTA so as not to dent the OTA But even after that alignment..the secondary can be way off..mine was too Link to comment Share on other sites More sharing options...
Guest MichaelDurban Posted September 15, 2014 Share Posted September 15, 2014 I see I'm a bit late with this post.. Link to comment Share on other sites More sharing options...
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