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Diagonal light path.

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Collimated the yard cannon, firstly with Airey rings , then a collimated laser straight up the ota. Right dead centre. The results were poor. I know the standard focuser flaps around like a kite but this was something else.

Had a go today, with the WO diagonal in the beam was way out, so stuck in a cheapo SW diagonal and spot on.

I usually keep the WO for best, there might be a way to tweak it into submission.

Just shows when you've checked everything, think again !


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