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Thread: Help with Barlow lens 2x

  1. #11
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    Default Re: Help with Barlow lens 2x



    Quote Originally Posted by Voyageur View Post
    Question for Shorty Barlow: the OP's scope has a focal length of 1000mm but the OTA is less than half of that, indicating that this is a Bird-Jones type scope. How well do Barlow lenses work with these scopes, given that they already have a Barlow-like corrector lens in the focuser?

    Comment for BiSam: a 5mm EP will give 200x in your scope, and I stand by my comment that that would give you disappointing results about 99% of the time. I agree with Shorty Barlow that a 6mm EP could work for you when the seeing is good, and there would be no harm in trying an inexpensive 6mm Plossl in your scope. Even if you only use it on the rare night with great seeing, it will be a good addition to your equipment. Who knows what other scope(s) you might get later? I bought a 7mm EP years ago, before I knew much about telescopes, and it was unusable in my f/10 Meade SCT. I held onto it for about 15 years, and now use it all the time in my f/6 refractor.
    Ok, thank you for the help!
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  2. #12
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    Default Re: Help with Barlow lens 2x

    Quote Originally Posted by Voyageur View Post
    Question for Shorty Barlow: the OP's scope has a focal length of 1000mm but the OTA is less than half of that, indicating that this is a Bird-Jones type scope. How well do Barlow lenses work with these scopes, given that they already have a Barlow-like corrector lens in the focuser?
    No idea. I suspected it was a Bird-Jones though. I suppose it would be a trial and error thing.
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  4. #13
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    Default Re: Help with Barlow lens 2x

    Quote Originally Posted by BiSam View Post
    Yes, it is the barlow i used with moon and mars.
    Will 6mm be right even for less visible objects like comets and deep space objects?
    Thank you!
    It depends on the object. 167x will split the Double Double and many other binary/double stars. In my experience you would need a much larger aperture to make use of 150x or above regularly. Most comets I've seen are with refractors of 80mm or smaller at under 100x, and more often under 50x. Astronomy is more about light gathering than magnification and this is especially true for most DSO's.

    Planets are different in many respects as the brightest tend to show detail starting at around 150x. In my experience the minimum aperture to really benefit from 150x (or above) is 150mm for a reflector and 100mm for a refractor.

    I think a regular magnification of 167x for faint deep sky objects is optimistic for a 114mm, f/8.7 reflector.
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    Default Re: Help with Barlow lens 2x

    One last thing: yesterday i saw on internet som photos of big planets like Jupiter and Saturn, that were made with a SkyWatcher 114/900 EQ. Those photos were really big and clear, so i'm sure the photographer was an expert and he used some additional accessories and softwares specific for astrophotography, but i was wondering if you could give me some advices to improve my photos and, eventually, have some decent ones.

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    Default Re: Help with Barlow lens 2x

    Quote Originally Posted by BiSam View Post
    One last thing: yesterday i saw on internet som photos of big planets like Jupiter and Saturn, that were made with a SkyWatcher 114/900 EQ. Those photos were really big and clear, so i'm sure the photographer was an expert and he used some additional accessories and softwares specific for astrophotography, but i was wondering if you could give me some advices to improve my photos and, eventually, have some decent ones.
    The easiest way to capture clear and sharp planetary and lunar images is to capture many frames as a video with a high speed planetary cam. Even a simple web cam can do nice things.

    I typically run off short 1000-frame videos. I then process the video through Autostakkert! and sort the frames by quality. I then (using the same software) stack the best 10% of the frames. After that is done, I move over to Registax or ImPPG to apply wavelets or a deconvolution routine to sharpen up the staked image. Easy peasy and you get some nice results that way.
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    Default Re: Help with Barlow lens 2x

    Quote Originally Posted by bladekeeper View Post
    The easiest way to capture clear and sharp planetary and lunar images is to capture many frames as a video with a high speed planetary cam. Even a simple web cam can do nice things.

    I typically run off short 1000-frame videos. I then process the video through Autostakkert! and sort the frames by quality. I then (using the same software) stack the best 10% of the frames. After that is done, I move over to Registax or ImPPG to apply wavelets or a deconvolution routine to sharpen up the staked image. Easy peasy and you get some nice results that way.
    I have something like this now but yet have to actually use it but that is coming soon.
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    Default Re: Help with Barlow lens 2x

    Quote Originally Posted by bladekeeper View Post
    The easiest way to capture clear and sharp planetary and lunar images is to capture many frames as a video with a high speed planetary cam. Even a simple web cam can do nice things.

    I typically run off short 1000-frame videos. I then process the video through Autostakkert! and sort the frames by quality. I then (using the same software) stack the best 10% of the frames. After that is done, I move over to Registax or ImPPG to apply wavelets or a deconvolution routine to sharpen up the staked image. Easy peasy and you get some nice results that way.
    Do you think i can use my phone to shoot those videos? It has "pro" mode so i can set ISO, exposure and exposure compensation (focus and white balance too, but i don't think i will need them).

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    Default Re: Help with Barlow lens 2x

    Quote Originally Posted by BiSam View Post
    Do you think i can use my phone to shoot those videos? It has "pro" mode so i can set ISO, exposure and exposure compensation (focus and white balance too, but i don't think i will need them).
    Likely, especially on the Moon, and provided you can secure the phone steadily over the eyepiece. I have a friend, Tom, who had made some impressive Lunar, Jupiter, and Saturn captures with his phone.

    They won't have the same level of detail as a dedicated planetary cam, but will be nice in their own right.
    Bryan
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