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For those struggling to collimate there Astrotrac Polarscope (as I was), check the tube housed in the main body of the scope for flex and ensure it is the right way round.

today I removed the tube and swapped it around, this made ALL the difference, collimation was a breeze after this.

I have already swapped out the grub screws for thumb screws and remember to make tiny adjustments each time.

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Also check it for parallax, mine had terrible parallax out of the box. And the collimation of the rotating polarscope arm, mine was significantly out when I checked it (fix = pieces of tape under one side or the other). Finally, get a couple of inches of pipe-insulation to prevent it dropping out every time you breathe too hard :)

Apologies in advance if you've already done all this, but I'm spelling out my own experience...

Cheers, Magnus

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Out last night and managed a 15 minute sub with no trailing at 24mm. Astrotrac reset after 45 minutes and Polaris bang on in the polarscope still.

 

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