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Thread: Hyperion eyepiece and the 2" filter

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    Default Hyperion eyepiece and the 2" filter



    Just curious about this:

    Baader advertises that, beside their finetuning rings, using a 2" filter would also have the effect of changing focal length of a Hyperion eyepiece. Does anyone know if there is something special with the Baader 2" filters that makes this possible? Or can I use *any* standard 2" filters and achieve the same results?
    Scopes: Celestron Nexstar 5SE & Travel Scope 70, Omron 620D2, Orion Skyscanner, Tasco Spacestation
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    1.25" Filters: Olivon Polarizing, Orion Skyglow, Lumicon OIII, DGM NPB Imaging: Celestron NexImage 5. Revolution Imager R2 Binos: Celestron Skymaster 15x70

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    Default Re: Hyperion eyepiece and the 2" filter

    The Hyperions are a 2" EP with a 1.25" Barlow that attaches to the bottom. When you move the Barlow further from the top elements (use a fine tuning ring), it changes the effective focal length increasing magnification. The same is true (in the opposite direction) when you totally remove the 1.25" Barlow making the EP 2" changing the focal length decreasing magnification. You can use a 2" filter in place of one of their fine tuning rings to change the focal length and increase magnification, but then you have the filtering effect in place.
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    Default Re: Hyperion eyepiece and the 2" filter

    Quote Originally Posted by Ozman13 View Post
    You can use a 2" filter in place of one of their fine tuning rings to change the focal length and increase magnification, but then you have the filtering effect in place.
    Thanks a lot! The question I am most interested is, do I have to use Baader's 2" filter to achieve this, or would any manufacturer's 2" filter achieve the same effect? Is there something proprietary about the threads in a Hyperion that would have prevented me from using, say, a Lumicon 2" filter, to achieve this?
    Scopes: Celestron Nexstar 5SE & Travel Scope 70, Omron 620D2, Orion Skyscanner, Tasco Spacestation
    EPs: ES: 68° 24 Baader: Hyperion 8/21/36 + finetuning rings - Celestron: Ultima Duo 17, X-Cel LX 9/12, Kellner 10/20 - Meade 5k UWA 14 - Omcon/Orion Sirius Plossl 10/12.5/17/20/32 - Orion E-Series 10/20
    1.25" Filters: Olivon Polarizing, Orion Skyglow, Lumicon OIII, DGM NPB Imaging: Celestron NexImage 5. Revolution Imager R2 Binos: Celestron Skymaster 15x70

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    Default Re: Hyperion eyepiece and the 2" filter

    Nothing special about using Baader's filters. You just need the space between the Barlow element and the upper elements, the more space the more magnification. I would be careful when doing this not to screw the filter to tight to either the upper housing or the Barlow to avoid scratching the filter. Both would tighten up against the glass of the filter unless the filter had a long housing and the glass was really recessed.
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