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Thread: 2" filters with 1.25" eyepieces

  1. #1
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    Default 2" filters with 1.25" eyepieces



    I've got a mixture of 2" and 1.25" eyepieces. I would like to purchase Oxygen-III (nebula) and moon filters. However, I don't want to purchase both a 2" and 1.25" variety of each filter to use with the two different size eyepieces. Is there any way that I can use the 2" filters with both 2" and 1.25" eyepieces?

    I've already checked the eyepiece adapter on my telescope, and although I was hoping that it was threaded for use with 2" filters, I'm afraid it is not. My hope was that if the eyepiece adapter was threaded, then I could attach the filters to the adapter in which the 1.25" eyepieces are inserted. Given that it is not threaded, is there another option?

    Thanks!
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    Jason Voegele, Cincinnati, Ohio, USA
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    Default

    Probably not. But somebody on this forum did point me to this, which lets you use 1.25" filters with a 2" eyepiece:


    http://agenaastro.com/blue-fireball-m48-male-m28-5-female-adapter-m-01.html

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    Default Re: 2" filters with 1.25" eyepieces

    Get only the 2" filters and get a 2" to 1.25" adapter that is threaded for 2" eyepieces. I have 7 of them and they are all threaded. Just make certain you have the 2" filter removed before you insert a 1.25" barlow to avoid hitting your filter. Some 2" to 1.25" adapters actually have a small ridge to prevent that from ever happening, that kind is really the best.

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    Default Re: 2" filters with 1.25" eyepieces

    Thank you very much, Lane. I think I found an adapter like you've described here: Orion 2" to 1.25" Precision Centering Adapter | Orion Telescopes

    I'm not worried about the barlow, since I will be using a 2" barlow that has its own 1.25" adapter built in.

    Again, many thanks.
    Jason Voegele, Cincinnati, Ohio, USA
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    Default Re: 2" filters with 1.25" eyepieces

    Hello Jason,

    Baader provides for the aspheric 2" Hyperions a filter adapter 2"-to-1.25".
    Here is the full line of the Hyperions, scroll down to the aspheric
    Eyepieces
    It has been included with my Hyperion aspheric 31mm 2" EP.
    Let us know, if you can pic up just the adapter at alpineastro, or elsewhere.

    Best,

    JG
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    Default Re: 2" filters with 1.25" eyepieces

    I am not sure I would buy the Orion adapter - only because I have had a lot of trouble over the years with their threads not matching other company's filters. If you can get a Televue adapter you will be much better off. Their threads seem to work with every filter I have ever bought including most Orion filters, they are by far the most compatible I have found. Of course Orion's return policy is great so if it does not work with your filters you can just send it back.

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    Default Re: 2" filters with 1.25" eyepieces

    Quote Originally Posted by Lane View Post
    I am not sure I would buy the Orion adapter - only because I have had a lot of trouble over the years with their threads not matching other company's filters. If you can get a Televue adapter you will be much better off. Their threads seem to work with every filter I have ever bought including most Orion filters, they are by far the most compatible I have found. Of course Orion's return policy is great so if it does not work with your filters you can just send it back.
    The Baader adapter 2"-to-1.25" is matched to the 2" 72deg eypiece in order not to reduce (too much) the field of view. It's form is that of a conus, in order not to hit the diagonal when focusing. Some small practical issues, well to be considered.

    Best,

    JG
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    Default Re: 2" filters with 1.25" eyepieces

    Based on my experience, I agree with Lane's assessment about Orion's threaded items not playing well with other brands. It seems to me that threaded items carried by Orion are not made to the same tight tolerances as say those for Televue, or some other companies.
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    Default Re: 2" filters with 1.25" eyepieces

    My bad - Televue does not put threads on their adapters. They are concerned with you putting a long barrel eyepiece or barlow in there and scratching a filter, which is a valid concern. What I thought was a Televue adapter is actually just one of the adapters I got with various telescopes I have bought over the years. All of them seem to work fine and have no threading problems, the brands are Astrotech, Feathertouch, TMB, Lumicon, Williams Optics, and Stellarvue. I doubt Feathertouch really makes their adapters so no telling what brand that is. I would not buy a Lumicon adapter because they don't use the brass ring inside they just use a brass set screw. I tested my filters on all these adapters and other than the Orion filters everything else worked fine. The Orion filters actually work fine with all but one of my adapters but the brands are not stamped on them so I don't know which one failed. The filters I tried are Lumicon, Meade, DGM, Baader, and Orion. My orion filters will not thread into my Televue diagonal either but all my other filters will.

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    Default Re: 2" filters with 1.25" eyepieces

    Well, you've all given me a lot to think about! I hadn't considered compatibility issues. Unfortunately, I've already ordered the Orion adapter, but as Lane mentioned, they do have a good return policy so if it doesn't work out I'll just send it back to them.

    Thank you all for all of the great information!
    Jason Voegele, Cincinnati, Ohio, USA
    Celestron CPC Deluxe 1100 HD telescope,
    Orion SkyQuest XT8 Dobsonian telescope,
    Orion UltraView 10x50 binocular

 

 
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