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Thread: Using filters - high power or low power?

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    Default Using filters - high power or low power?



    Hi,

    I just ordered a 2inch filter (UHC) to use for better seeing nebulas with my 200p Dobson scope. I ordered the 2inch to be able to use it with the 26mm and 35mm wide angle eyepieces as I thought this would give the best views. This means it will not fit the more high power eyepieces (10mm and a Barlow is what I have). What are your experiences with this?

    Br Anders

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    Default

    Have a look at your 2" to 1.25" adapter - some are threaded to take 2" filters on the bottom.
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    Default Re: Using filters - high power or low power?

    If your adapter is threaded Br Anders just watch out that any 1.25 eyepieces don't penetrate it too far and hit the filter...My 1.25 ES 6.7mm eyepiece was like this and I simply added a couple of snug fitting O rings onto the eyepiece to limit its penetration----------------------------ZX
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    Default Re: Using filters - high power or low power?

    Thanks for the idea. The adapter does not have a thread, but the extension for the 2 inch eyepiece does, and I've ordered a 2 inch Barlow, that comes with a more flat converter to 1.25 inch. Maybe I can combine that converter with the extension and make it work.

    This part of the hobby is kind of like getting back to playing with Lego combining all kinds of bits and pieces to make it work. Except that you are doing it all in the dark. How do you normally take care not to loose anything while taking small bits apart and combining them again in the night?
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    Default Re: Using filters - high power or low power?

    A small folding table--An eyepiece case--And a clip on dim red light--------------------------ZX
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    Default Re: Using filters - high power or low power?

    Since narrowband UHC filters dim the view, I think you'll find using the UHC more detail revealing with low power eyepieces anyway. Something like 3x to 12x per inch of aperture, so in a 5" scope - 15x to 60x power roughly. Your scope - 24x to 96x roughly.

    Lower power eyepiece means bigger exit pupil and brighter image.
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    Default Re: Using filters - high power or low power?

    Quote Originally Posted by Ahjessen View Post
    ...
    This part of the hobby is kind of like getting back to playing with Lego combining all kinds of bits and pieces to make it work.
    ...
    I knew there was something I liked about this hobby!

    Nice analogy.

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