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Blueearthling

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Posts posted by Blueearthling

  1. On 30/12/2022 at 17:32, Philip R said:

    For solar, then I would recommend a refractor and a Hershel Solar Wedge...
    IMG_0675.thumb.JPG.d35db4742dbd9aa1808b501956a0ba0f.JPG<--- an image my TeleVue Ranger with a Hershel Solar Wedge.

    ...simple reason is [and my opinon] is that a is much safer than a solar film or glass filter covering the front element. Reasons why are...

    • solar film filters have to be checked every time before use for tears to the fabric film.
    • glass filters also have to checked every time before use for scratches on its surface. 
    • less chance of it falling off or being blown off if not secured to the telescope.
    • a Herschel Solar Wedge is suitable for refractors only not Petsval type telescopes or camera lenses.

    Below are a few images from my iPhone using the above setup...
    1126745289_IMG_1112(2).thumb.jpg.27b461efa3274b5530f7f14e8546839e.jpg473365996_IMG_1207(2).thumb.jpg.0f85f50c5a92ba555335dab236adfdff.jpg
     

    The cheaper option is a solar film filter and they will give a pale-blue to white image of the Sun. You can make your own or purchase the ready made. 
    If you make your own solar filter, remember to make one for the finderscope, or remove it before use.

    Glass solar filters are more expensive and they give an orange/yellow image.

    Should you decide on a Hershel Solar Wedge then please make sure it has a ND3 built in. For better results a Solar Continuum filter and a polarising filter will enhance the viewing and give a green image of the Sun.

     

    Reference to the 'mod'... Many years ago, I was tightening up the retaining screw on my mount and the dovetail bar snapped and the ETX105 crashed to the ground. Fortunately it was grass, but the ETX series has a lot of plastic, so it damaged two of three mounting points on the plastic rear end. I politely enquired at a local engineering  workshop if they could make/fabricate a replacement back for it. Armed with a rough sketch/plan and using the damaged one as a template to align the mounting points, etc., they made the one as shown in my earlier reply from a billet of aluminium. As I lost provision for attaching a replacement dovetail bar, I secured it to the OTA with a couple of Jubillee hose rings, lined with neoprene strips.

    Hi, can a hershel solar wedge be used with a schmidt cassegrain?

    Thanks.

    • Thanks 1
  2. 17 hours ago, Louis D said:

    If you don't need long eye relief, the new Svbony 3-8mm zoom eyepiece is excellent from 5-8mm and very good from 3-5mm.

    However, I'd start with a decent mid-power wide field in the 12mm to 16mm range.  There are a lot of good options depending on your budget.

    Budget is around £150

  3. Hi all, I'm returning to star gazing after about 12 years or something like that. I'm having difficulty remembering what I learned (which wasn't much compared to you guys) first time round.

    Anyway, I need some help with a new eyepiece. I'm using a 12" Dobsonian. I want to start some planetary observations with my son. I've done some research and I belive I should buy a Orthoscopic eyepiece.

    I would appreciate any help. Thank you.

  4. Thanks for the reply.

    I think I am leaning towards the 10 inch skywatcher flextube. They seem to be quite well liked on here.....

    Couple of questions though.

    Will I need a fan? If so are they easy to fit and can someone recommend one please?

    Any other accessories I will need to consider to get good use straight away?

    Thanks in advance.

  5. Hi,

    I moved to Sweden last year. The moving company broke the mount of my celestron nexstar 6se so I haven't been doing any viewing lately.

    We have some amazing clear nights here but a bit cold!

    I'm thinking about buying a new telescope, maybe a dobsonian 10 inch. I have up to an absolute Max of a grand to spend. Any recommended please?

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