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Thread: Questions about focal reducer and filters/t-adapter...

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    Default Questions about focal reducer and filters/t-adapter...



    Basically, I want to buy this focal reducer:



    I'm pretty sure this will work with a NexStar 6SE, if not please correct me. Anyway, from what I can tell (and it's not entirely obvious) it outputs to 2", which is a problem because my T-Adapter and filters are 1.25" sizes. So assuming it does output to 2", my questions are:

    1. Is there a converter of some sort so I can use my existing filters and T-Adapter?
    2. Would converting from 2" to 1.25" degrade image quality (vignetting, etc)?
    3. I'm hoping not, but am I better off just re-purchasing everything in 2" sizes?



    If anyone could clarify these points I would be greatly thankful.


    ~Ashley

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    Default Re: Questions about focal reducer and filters/t-adapter...

    Can't you just use the visual back that you take off to add the reducer?

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    Default Re: Questions about focal reducer and filters/t-adapter...

    You know I feel like an idiot, but I never thought of that... I suppose that would work. But my question does still stand if it would have any effect on the image quality. I know that with cameras if you stop down filters enough you get clipping around the edges, so I'm not sure if this is the same or not?

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    Default Re: Questions about focal reducer and filters/t-adapter...

    Well it would be no difference then adding a adapter right? The length of the visual back won't be any longer then a adapter. I think you just put the visual back on top of the focal reducer.

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    Default Re: Questions about focal reducer and filters/t-adapter...

    Hi Ashley.
    You definitely want the Celestron 6.3 focal reducer!
    So you have the 1.25 "universal" t-adapter? If so get rid of it.
    Your image train should be.... Remove visual back.
    Scope + focal reducer + #93633-A t-adapter + t-ring + camera.

    You DEFINITELY want this t- adapter.. http://www.amazon.com/Celestron-T-ad...ords=t+adapter

    If you have this one ... http://www.amazon.com/Celestron-9362...ords=t+adapter
    Get rid of it!!
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    Default Re: Questions about focal reducer and filters/t-adapter...

    @OttoMann, I actually have one made by Orion that also allows you to do EP projection. Does the one you suggest have a thread to allow for a 1.25" filter tho? The Amazon page isn't entirely clear from what I can see.

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    Default Re: Questions about focal reducer and filters/t-adapter...

    No it doesn't

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    Default Re: Questions about focal reducer and filters/t-adapter...

    Quote Originally Posted by ashleyy View Post
    @OttoMann, I actually have one made by Orion that also allows you to do EP projection. Does the one you suggest have a thread to allow for a 1.25" filter tho? The Amazon page isn't entirely clear from what I can see.
    Oh..
    Can you show me which one you use?
    Camera Adapters & T-Rings | Orion Telescopes: Shop

    The deal is the distance to the camera sensor needs to be 55mm. The image train I posted before is perfect for that. I am
    un familiar with the Orion adapter you use..
    Kurt

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    Default

    Using 1.25" filters will have more vignetting than a 2" filter. Depending on if you intend to stick to the hobby of astrophotography for some time, it would be wise to purchase 2" filter and accessories. And if you know you're hear to stay then it might even be wise to forget that wedge you're talking about in another thread and use that money to go towards as equatorial mount.
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    Default Re: Questions about focal reducer and filters/t-adapter...

    Quote Originally Posted by ashleyy View Post
    Basically, I want to buy this focal reducer:
    I'm pretty sure this will work with a NexStar 6SE, if not please correct me. Anyway, from what I can tell (and it's not entirely obvious) it outputs to 2", which is a problem because my T-Adapter and filters are 1.25" sizes. So assuming it does output to 2", my questions are:
    1. Is there a converter of some sort so I can use my existing filters and T-Adapter?
    2. Would converting from 2" to 1.25" degrade image quality (vignetting, etc)?
    3. I'm hoping not, but am I better off just re-purchasing everything in 2" sizes?
    The Celestron SCT Reducer has the same "SCT Threads" on both ends - just as found on the back of your C6 Scope. This is so that it will simply "Plug-In" to your existing Imaging/Visual setup.

    You already have "the converter", as you are already connecting gear to the back of your Scope. Is it the "best configuration possible" - probably not since you mention that you currently use 1.25in Filters and T-Adapters (which are going to be the primary source of any Vignetting).

    You are already "converting from 2in to 1.25in" so that damage is already done.

    You can always look to "upgrade" to 2in components for as much of your rig as possible. It will remove sources of vignetting, as you go.
    But, realize that the C6 has only a 27mm (1.1in) exit baffle at the visual back (per Celestron), so you aren't really going to see any reduction in Vignetting by moving to 2in gear.
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