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Thread: How to correct Celestron Nexstar 130 slt focus for Astrophotography

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    Hey guys.

    I also did the primary mirror correction and when i went to use it with a Vixen NPL 30mm i had to moove away to EP outward a little. Is that normal?

    I tryed also using the dslr but couldn't get anything. I have to get back to that.

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    Default Re: How to correct Celestron Nexstar 130 slt focus for Astrophotography

    That's normal since you moved the mirror forward. Let us know if you are able to get your DSLR to focus now (it should if you moved the mirror far enough).
    Gene

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    What is the minimum distance?

    I'll have to check it later when i get home.

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    Default Re: How to correct Celestron Nexstar 130 slt focus for Astrophotography

    Minimum distance depends in part on how and where your camera is attached to the scope. For example, it would need to be more if you used a Celestron Universal 1.25" T-Adapter instead of the built in T-threads on the focuser. It would be less if you used a so called low profile T-ring. It depends also on the exact focal point of your sample of this scope (which could be a little different than in my sample). Unfortunately, I no longer own my 130SLT, but the picture below gives some idea of the minimum needed for my scope (perhaps "5/8" longer than the stock screws).



    Later I changed these out to a different set of hardware so the focuser tube would be out far enough so as not to cut into the optical path:

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    Default Re: How to correct Celestron Nexstar 130 slt focus for Astrophotography

    A simple 2x or 3x Barlow or extension tube worked fine for me to achieve focus with my Canon t2i without having to adjust my mirror on my 130SLT.

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    Default Re: How to correct Celestron Nexstar 130 slt focus for Astrophotography

    The down side of the barlow approach is that it increases focal length thus requiring much longer exposures. This is not a problem for photographing planets and the moon but is a big problem for photographing deep space objects.
    SXINIAS

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