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    psonice's Avatar
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    Default Upgrading a bresser skylux NG?



    I only got this scope (my first) last week, but was just wondering if it's worth upgrading it a bit?

    I've read somewhere that one of the tubes is very shiny internally, and black cardboard helps a lot.. anyone had this with this telescope? Which tube is it supposed to be, all of mine look pretty black. Maybe they corrected that?

    Also, anyone tried an upgraded eyepiece with it? I've also read that 6mm is about the optimum.. would that be a big improvement? The 20 & 12mm ones seem ok, but the 4mm isn't giving me the best of views I feel.

    How about filters too? Is it worth getting one/several? I noticed when looking at jupiter earlier that it's very bright to look at, and hard to see the surface detail because of that. I can just see the two darkest stripes, the rest is bright white.

    The mirror too.. any point in swapping that for a prism?

    Speaking of jupiter, I accidentally viewed it earlier while the erecting eye piece (for looking at landscapes the right way up) still connected. Well, I couldn't get it anywhere near in focus, but the 'unfocussed blob' was very odd. It had stripes, and basically looked just like a hugely magnified jupiter, but faint and a bit out of focus. Is it possible to see detail like that in such a case? It seems much more likely to be some kind of artifact to me, but yet it did look very much like jupiter, which would be quite a coincidence?!

    Thanks in advance

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    Hello Psonice, and welcome to Astronomy Forum!

    I "did a google" on your scope, and there's a bunch of info there. As to your questions:

    "Shiney" inside an eyepiece or in the telescope is not a good thing. It will allow light to bounce around and degrade your image. If you have it and can correct it, do.

    4mm is a very high powered ep which, in optimum conditions, if its a good one, will give you good results. More likely, it won't be of much use to you.

    Colored filters are useful for bringing out planetary detail. OIII and Ha filters are useful for nebular views. One can usually save money buying them "pre-owned" on the forums.

    Mirrored diagonals are generally preferred to prisms as some light is lost as it is refracted through the glass.

    Your erecting prism will not give you good astro-views, as you learned. Cooincidence? No, you got what you could expect using it.

    Makes sense? Ask if you need clarification on any of this. And, thanks for joining us...



    Bob
    6 inch F/5 GEM mounted reflector

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  4. #3
    psonice's Avatar
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    Hello Bob, and thanks! Looks like a good friendly board here.

    Quote Originally Posted by BobDob View Post
    4mm is a very high powered ep which, in optimum conditions, if its a good one, will give you good results. More likely, it won't be of much use to you.
    I've seen suggestions that there's some 'limit' to the smallest focal length ep, based on the size of the scope, is that right? If so, what's the calculation, and what happens if you go beyond it? (I think people elsewhere on the net suggested that 6mm or so is the reasonable limit for this 70/700 scope).

    Has anyone tried a 6mm ep with the skylux? Is it much of an improvement on the 12/4mm eps?

    Colored filters are useful for bringing out planetary detail. OIII and Ha filters are useful for nebular views. One can usually save money buying them "pre-owned" on the forums.
    Thanks. I'll look into getting a coloured one, as I think it'll be mainly planets I'll be looking at initially.

    Mirrored diagonals are generally preferred to prisms as some light is lost as it is refracted through the glass.
    Aahh. I thought prisms were better in some way - good to know I'm wrong there. Guess I'll stick with the one that came with it until I get a chance to borrow a better one somewhere to compare then.

    Your erecting prism will not give you good astro-views, as you learned. Cooincidence? No, you got what you could expect using it.
    Yeah, I realise that it's not intended for viewing planets, and all I expected was a slightly bigger but unclear picture. What I actually saw wasn't that at all though: it was more like looking at jupiter with a 1500x magnification (it should have been more like 100x or so).

    With my 4mm eyepiece (175x) jupiter is a small circle with some detail visible. With the 12mm + 1.5x erector I saw a very large disk (as in so big I could only see 50% of it at a time!) with uneven banding across the surface. It was faint and blurry, but looked like jupiter, and didn't change as it moved across my view as I'd expect if it was an artefact. Then again, I can't see how it's possible that it was somehow magically giving me 1500x magnification with a stable image (I was pointing the telescope through a closed window, at an angle!) so surely it MUST just be a coincidentally jupiter-like artefact If not though, I'd be happy to trade the blurriness for such a close-up view.

    Another quick question: photography. With a fairly decent digital camera, an adaptor to fit it onto the scope, but no motor, what can I expect to capture? The moon should be fine I guess, while I've zero chance of catching anything faint. Would mars/venus/jupiter be reasonable targets? I'm pretty good with image processing at least if the photos aren't so hot

 

 

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