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Thread: Optimal Eyepiece For Viewing The Sun

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    Default Optimal Eyepiece For Viewing The Sun



    I am trying to get ready for the Aug. 21 eclipse. I have been using my 40 mm eyepiece but the sun is too large in the viewing area. I'm afraid I would miss much of the corona during totality. What size eyepiece would fit the sun about the size of a quarter or half dollar in the viewing area? Thanks.

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    Default Re: Optimal Eyepiece For Viewing The Sun

    What scope are you intending to use?
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    Default Re: Optimal Eyepiece For Viewing The Sun

    For my 8 inch SCT with my white light solar filter, the sun fits just right in my 40mm 1.25" EP from Celestron.

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    Default Re: Optimal Eyepiece For Viewing The Sun

    You can get a good idea here.

    Astronomy Tools

    Choose "The Sun" from the pull down in the Solar System field and enter the requested data for your Scope (FL & Aperture) and Eyepiece (FL & AFOV). Just leave the scope and eyepiece fields on "Custom". Select a Focal Reducer/Barlow if any is used. Then click "Add To View". The view can display many different eyepiece/modifier combinations at the same time so play around.

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    Default Re: Optimal Eyepiece For Viewing The Sun

    Thank you for the quick responses. I am using a Celestron CGE1100, focal length 2800mm/F10.

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    Default Re: Optimal Eyepiece For Viewing The Sun

    OK, so the Sun fits inside the FOV of the 40mm eyepiece but as you say you want it to be smaller to see the corona. Did your scope come with a 2" diagonal? You'll need one if not to be able to get a wider field of view using a 70 degree eyepiece for example.
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    Default Re: Optimal Eyepiece For Viewing The Sun

    You may want to look into a 0.63x reducer. That and a 40mm Plossl would give you a good field.

    2017-08-09 08_46_16-astronomy.tools.png
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    Default Re: Optimal Eyepiece For Viewing The Sun

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    Default Re: Optimal Eyepiece For Viewing The Sun

    Be careful you get off that eyepiece before totality ends. A rude (and potentially damaging and painful) flash awaits. Set a timer.
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    Default Re: Optimal Eyepiece For Viewing The Sun

    Hey guys, I bought the last Celestron f/6.3 Reducer/Corrector available on the internet at this time. There was one left at a reasonable price on the internet plus it ships free within 3-4 days. Can't beat that. Thanks for all you guys' help!
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