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    Default Focusing a Lunt 60mm H-a



    Hi All
    I've just recently acquired a rather fine Lunt 60mm Solar Scope. It's detailed specs are as follow:
    Lunt 60mm H-alpha Solar Telescope, B1200, Crayford focuser and Pressure Tuner.
    In using it I have discovered that it is rather difficult to get pin sharp focus. I adjust the coarse focuser, the fine focuser and the pressure tuner in that order. I'm concerned that I am missing some trick or other to fine tune this scope and wondered whether anyone out there had any useful tips that might improve my focusing technique.
    Thanks

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    Default Re: Focusing a Lunt 60mm H-a

    I have one of these myself, and had the same difficulties at first. The focusing technique is to firstly slide the focuser's draw tube out about 2" from the focuser, then use the coarse focus knob to get a pretty good focus, then the fine focus knob for final adjustment. The pressure tuner is used to highlight prominences or surface detail. Hope this helps

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    Default Re: Focusing a Lunt 60mm H-a

    I'd add that we use one of these for solar outreach. The general consensus for us is to also let it sit out in the sun and 'bake' for 30 minutes to an hour before the views are the sharpest.

    Dan
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    Default Re: Focusing a Lunt 60mm H-a

    Quote Originally Posted by dcrowson View Post
    I'd add that we use one of these for solar outreach. The general consensus for us is to also let it sit out in the sun and 'bake' for 30 minutes to an hour before the views are the sharpest.

    Dan
    That's going to be hard on th OP, I can't remember the last time I got sunshine for a whole 30 minutes.
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    Default Re: Focusing a Lunt 60mm H-a

    As noted above, slide the tube out a bit (1-2") and go from there.
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    Default Re: Focusing a Lunt 60mm H-a

    I also have the very same scope and Larry is right. Funny thing I would have never believed before owning it is you need to focus continually for different distances of the suns croma sphere. So you need to tune for a targret ( flare or surface detail, sun spots) and the refocus and the retune. The sun has alot of depth and slight tuning of the athelon brings out different detail. Lots of wow's.
    Bruce
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