Hi Mike
that looks very good
Question about PST mod: keeping collimator lens at -200mm during focussing
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Re: Question about PST mod: keeping collimator lens at -200mm during focussing
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Re: Question about PST mod: keeping collimator lens at -200mm during focussing
It was late when I posted the image last night and I didn't include an explanation . My first configuration used 2" extensions in place of the focuser . The mod was functional this way but not optimum and the sweet spot was difficult to deal with when the etalon was moving with the focuser . In my opinion for best results the etalon needs to be fixed at the 200mm location . I use this in a Celestron 102 Omni XLT with 3" removed from the tube , I lock the original focuser extended 1" and this places the etalon at the magic 200mm . This is the same mod using a B1800 straight through BF .