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Thread: Can I use my 1.25" filters on my new 2" eyepiece?

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    Default Can I use my 1.25" filters on my new 2" eyepiece?



    This might seem like a dumb question but I can't seem to get any clear answers. I presently have all 1.25" eyepieces with an Orion ultrablock and Lumicon polarizing filter. I am getting a ES 18mm 2" EP for Christmas. Will I be able to use my old filters (about $125 invested) with my new 2" EP? Or will I have to invest in new filters?
    thank you

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    Default Re: Can I use my 1.25" filters on my new 2" eyepiece?

    You will have to invest in 2" filters. The 1.25" won't fit into the 2" threads.

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    Default Re: Can I use my 1.25" filters on my new 2" eyepiece?

    No. You will need 2" filters for the 2" eyepiece. You can use 2" filters with 1.25" eyepieces because they will screw into the 1.25"-2" adapter.

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    Default Re: Can I use my 1.25" filters on my new 2" eyepiece?

    I'm afraid not. These EP's don't have a step-down adapter to make it possible to use in a 1.25" visual-back / diagonal. In that all your other EP's are 1.25"- I'd think you have a good variety to choose from for most of your observations. You can either delegate your soon-to-be 2" 18mm for objects that don't really need a UHC filter or polarizer. Or tighten your belt and get your new EP some 2" filters.

    Looks like a very nice EP for sure:

    Explore Scientific 18mm 82º Waterproof Eyepiece - 2" - All Eyepieces (Not Sets/Kits) - Eyepieces - OPT Telescopes

    Clear Skies,

    Dave

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    Default Re: Can I use my 1.25" filters on my new 2" eyepiece?

    It is an excellent EP. It is the primary DSO hunting EP used in my Z10 as it gives a nice magnification bump over the 24mm and still maintains a nice wide field of view.

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    Default Re: Can I use my 1.25" filters on my new 2" eyepiece?

    Thanks members! Now I know. Since I could only afford one good eyepiece, I chose the ES 18mm 2" @$149 since it was on sale at an Atlanta scope shop. I researched it for weeks and read countless reviews of all midranged EPs. I know there is drawbacks to all of them. This one has only a 13.6mm eye relief, but I can deal with it. My runner-ups were Hyperion aspherics and Williams Optical UWANs. Looking forward to looking for messiers on a clear Georgian fall night.
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    Default Re: Can I use my 1.25" filters on my new 2" eyepiece?

    That is my go-to EP and I probably use it 95 percent of the time while out in deep space!

    Although a shame that you do need more filters if you want to filter that EP, I am pretty sure you are going to love adding it to your collection.
    Will

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