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Thread: The Sky-Watcher ED Doublet 150mm Is Now For Sale

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    Default The Sky-Watcher ED Doublet 150mm Is Now For Sale



    Anybody own/try out this scope. What was the highest mag on planets etc? Just curious.

    Evostar 150 APO Refractor – Sky-Watcher USA
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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    They have just started delivering these, I do not think anyone here has one as of yet.
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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    Guess I'd better start saving up.

    So many scopes to buy, so little cash to buy them with.
    Bryan

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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    I really want this telescopes. I can feel it calling my name. :-)
    I read somewhere that they were going to use FCD100 glass in place of the FPL53 for the ED glass. Does anyone know that to be true?
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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    Had the APM 6" f/8 edapo lens on a C6R for that price, would goto 400+ powers. What a long, heavy beast to handle.

    Got a real 5" apo with -53 triple glass and it showed finer planetary details as well as being lighter and easier to mount.

    This one says 20 lbs. with accessories, that is as light as my 5"?!
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    Newtman but some refractors allowed.

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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    Quote Originally Posted by refractordude View Post
    Anybody own/try out this scope. What was the highest mag on planets etc? Just curious.

    Evostar 150 APO Refractor – Sky-Watcher USA
    Firstly, it looks like a great buy: and for once it is actually advertised cheaper in Australia than in the US!!! Very tempting, but the accounts department is aware that I only recently bought a 6"f6 achromat...

    Secondly, to answer the question: if the optics are well made there is no reason that it shouldn't be capable of the "2x per mm" or "50x per inch" of aperture that a good quality scope is capable of on a night of good seeing. Translation: 300x for a 150mm aperture. The caveat of course is "on a night of good seeing". I wouldn't want to bet on it achieving 400x as tomjones' APM did though- I suspect APM might have put more quality control into theirs.

    There is a resolution point though for any aperture, generally describe by the Rayleigh limit (see: http://www.telescope-optics.net/tele...resolution.htm ). For green light (~550nm) it can be approximated to 4.5/D, where D is the aperture in inches. Thus for a 4" scope, it is about 1.25 arc-seconds, and for a 6" scope ~ 0.75 arc-seconds. If the seeing conditions are such that you can resolve that detail, then any magnification above what is necessary to see that is not going to give a clearer image, and will only reduce the contrast. I am not sure what that magnification would be for a 6" scope, but I would guess around 300x. (Perhaps someone can enlighten us a bit more on this? JG? Gabby? not_Fritz?) The other problem of course is that the higher the power, the smaller the exit pupil, and the more "floaties" and other defects in our eyes limit the view. For a 6" f8 scope this would most likely come into play with a 4mm eyepiece, giving an exit pupil of 0.5mm: and again at 300x.

    I would be happy if it went to 300x though, especially for that price! I wonder is Skywatcher want anyone to provide an honest evaluation? My phone is ready and waiting for their call!

    - Dean

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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    Quote Originally Posted by bladekeeper View Post
    Guess I'd better start saving up.
    So many scopes to buy, so little cash to buy them with.
    Just sign up for another credit card and you'll have it in no time

    Abb
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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    It says it has an M48 adapter. I wonder what that does special to let you see M48?


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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    Hello Dean,

    an assessment of the Sky-Watcher refractors is given by AOK Swiss (Mr. Khler)
    AOKswiss online - deutsch
    and it is as expected.
    Important is the sentence I am translating:
    The lens mounts are fastened with small plastic adjustment screws; the lenses are not ground to become centric.
    (Die Linsenfassungen sind mit kleinen seitlichen Justierschrubchen aus Kunststoff; die Linsen sind nicht zentrisch geschliffen.)
    In short, in worst case this may result into a blur at the magnifications already above 200x.

    It looks like they have saved costs on centering the lenses when grounding the lens rims,
    and in a good hope this may be adjusted in the lens cell with the srews.

    Sorry for no better news,

    JG
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    Default Re: The Sky-Watcher ED Doublet 150mm Is Now For Sale

    Quote Originally Posted by j.gardavsky View Post
    Hello Dean,

    an assessment of the Sky-Watcher refractors is given by AOK Swiss (Mr. Khler)
    AOKswiss online - deutsch
    and it is as expected.
    Important is the sentence I am translating:
    The lens mounts are fastened with small plastic adjustment screws; the lenses are not ground to become centric.
    (Die Linsenfassungen sind mit kleinen seitlichen Justierschrubchen aus Kunststoff; die Linsen sind nicht zentrisch geschliffen.)
    In short, in worst case this may result into a blur at the magnifications already above 200x.

    It looks like they have saved costs on centering the lenses when grounding the lens rims,
    and in a good hope this may be adjusted in the lens cell with the srews.

    Sorry for no better news,

    JG
    When I saw the price, it was obvious that they have to cut costs somewhere. It is not just matter if good collimation could be achieved, but also how well it holds. You know how shipping companies handle packages and it does not take much to break a plastic screw...

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