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  1. #11
    Dxvid's Avatar
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    Default Re: DIY Image Intensifier for Telescopes



    Thanks for that. Yes the cascade P8079HP is certainly giving me a lot of pleasure! Some people seem to think that the idea is to replace ordinary viewing, but it's not that. It's just an accessory and like any accessory can help the scope do some things it otherwise can't do. For example when looking at globular clusters I would say that the intensifier effectively increases the aperture of the scope by at least twice, possibly more. When it comes to a choice between seeing the stars in a globular or seeing a faint grey circle with no detail the issue of green becomes irrelevant.

    It would be very interesting to see a direct comparison between the cascade and some gen3 tech.

    I'm also interested in anything that might improve the cascade. What did you mean by a "good CCD Light pollution filter"? You might have to spell it out, I don't know much about filters. I have tried the Orion Ultrablock on M42. It works well with an ordinary eyepiece but not with the cascade, it makes the image too dark. I've also used a moon filter when looking at Jupiter, although the image was already considerably darkened by using stacked barlows, but it did the trick if still a little on the bright side. Someone mentioned that a #25 red can be useful, I think they were talking in terms of cutting through light pollution. I have one of those and will give it a try next chance I get.

  2. #12
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    Default Re: DIY Image Intensifier for Telescopes

    well, i would suggest getting the filter curves from Orion's specs on the Ultrablock and compare to something like a Baader red 610nm longpass or IR longpass at 695nm. Most of the better filters display the filter curves right on the website. having the Ultrablock be too dark is a good control for comparing what might let more starlight through while blocking LP lighting. Also, the specs for the P8079HP tubes are available on the internet. Compare where it peaks and falls with what your filter blocks and you'll have a good idea to start. It can make a huge difference in performance on your IIE.

    A CCD filter simply is more tuned to mechanical ccd spectra let through, rather than visual eyeball spectra. Some filters would be better for 8079 than a gen 3.

    Good luck. I really enjoy the blog.
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  3. #13
    Dxvid's Avatar
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    Default Re: DIY Image Intensifier for Telescopes

    Last Wednesday night I did a comparative test of several different types of filters (broadband,narrowband,colours, Moon) on M42 under poor seeing conditions. The results more or less confirm what several people have been saying about filters used with intensifiers. You can see the test under the new "filters" link in the blog.

    Image Intensifier

  4. #14
    midimariusz's Avatar
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    Default Re: DIY Image Intensifier for Telescopes

    I recently made a text EEV P8079HP. I conducted the test with the SKy Weatcher 12 "teleksop. I used various accessories, barlens, focal length reducers and various filters. The original is written in Polish. You can read the English translation here. Of course, google translator. Enjoy reading.
    Sky Watcher 12" DOB ES 30 ES 14 ES 6.7, TS 7mm
    Lumicon OIII UHC 2", DSC
    TS 25X100, 10X50
    midimariusz.home.blog

  5. #15
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    Default Re: DIY Image Intensifier for Telescopes

    very nice diy night vision. unfortunately a lot of members have moved on as this forums isn't maintained anymore , a lot of us are over here now if you would like to discuss your eev p8079hp.


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