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Dual-Speed 2" Crayford Focuser


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Any advice on which type to purchase?

I understand that i will need a adapter,so it will fit the Skymax 180.

The reason is,the other night whilst observing Jupiter,albeit briefly,

when i changed eyepieces and tried to focus,the image seemed to 'jump' up,then it would 'fall' back into the centre of the eyepiece,if that makes sense!! Also,i have just read on here,about the 'clothes peg' trick.Not had a chance to try yet though.

Regards,

Sooty.

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