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Thread: 5x barlow

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    Default 5x barlow



    So i am looking for a 5x barlow to do some astrophotography. The short focal length requires a little more power for planets.

    I also just learned that barlow, focal extender etc are pretty much the same thing. I am looking at the 5x from explore scientific or at a much cheaper price there is the Anteres one.

    The power mate is a little expensive.

    Anyone have any experiences with a 5x?
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    Default Re: 5x barlow

    I have no experience with a 5 x barlow, and for good reasons, as I hope other members will attest.
    This would be far too much for 750 mm FL, giving an effective FL of 3750 mm!
    This would far exceed the intrinsic resolving power of the 6 inch mirror and would gain you ZERO!
    I use a 2 x barlow, prime focus on my 1200 mm FL CR-6 and can see this is really pushing the scope to it's limit.
    The field of view would be miniscule also and on an undriven mount is an exercise in futility IMHO.
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    Default Re: 5x barlow

    You MIGHT get some good results with a 3x Barlow, a 2X is much more versatile, a 5x is going to be pretty much useless.
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    Default Re: 5x barlow

    I've been pushing a 1200mm 6" refractor with the ES 3× to reasonable effect. I would not consider a 5× for that scope as that would be too much for that scope.

    Even the 3× is about to hit the wall and the better the seeing the better the image (though that is true regardless).

    This Jupiter image was done with that scope and the 3×.



    That said, I still find a 2× more versatile and more often usable. That's just my experience.
    Bryan

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    Default Re: 5x barlow

    I find I'm managing with 3x for the planets on my f5 refractor but theres a lot of cursing trying to find the likes of jupiter and saturn. And that red dot finder has to be pretty spot on cause my mount isn't ... And of course jupiter and saturn are pretty much straight up so using the red dot is very uncomfortable as well..
    It's not much good for the moon for me ... I can only image a 5x will be hell... but you can always screw off the lense and use it as an extension piece... that was why I originaly bought my 3x for ... good luck..
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    Default Re: 5x barlow

    I am not convinced i will get a 5x. I have a 3x now and works just great. I don't have any trouble finding planets but keep in mind i am not adding an eyepeice on it. It is strickly for planetary images. I strap on my dslr to it.
    6", 750mm Skywatcher BK newtonian
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    Default Re: 5x barlow

    I have a 5x Revelation (GSO) Barlow and the 5x TeleVue Powermate. I use them on short tube refractors for occasional lunar/planetary viewing. A 5x Barlow/amplifier is probably far too powerful for any telescope with a focal length of above 500mm.
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    Default Re: 5x barlow

    Quote Originally Posted by Shorty Barlow View Post
    I have a 5x Revelation (GSO) Barlow and the 5x TeleVue Powermate. I use them on short tube refractors for occasional lunar/planetary viewing. A 5x Barlow/amplifier is probably far too powerful for any telescope with a focal length of above 500mm.
    Annnnd what is your experience using your 5x barlows?

    If you use a 600 FL scope with a .85x reducer/FF, you are at 510 mm FL. How about this with a 5x barlow?
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    Default Re: 5x barlow

    Quote Originally Posted by Myrrdinemrys View Post
    Annnnd what is your experience using your 5x barlows?

    If you use a 600 FL scope with a .85x reducer/FF, you are at 510 mm FL. How about this with a 5x barlow?
    Let's see... focal reducer and a 5x barlow? Isn't that something like an optical contradiction?

    Not that that's a bad thing.... there are half silvered mirrors for instance...
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    Default Re: 5x barlow

    Quote Originally Posted by Myrrdinemrys View Post
    Annnnd what is your experience using your 5x barlows?

    If you use a 600 FL scope with a .85x reducer/FF, you are at 510 mm FL. How about this with a 5x barlow?
    I only use the Barlow/Powermate for visual. They enable me to use eyepieces like Plossls and orthoscopics of particular focal lengths for certain magnifications. An example would be being able to use a comfortable 15mm Plossl and get 167x on my modified ST102.



    I'm not sure why you would use a focal reducer combined with a Barlow. It seems a bit redundant. It would be akin to threading an 0.5x reducer into a 25mm Plossl to give it a 50mm focal length, then placing it into a 2x Barlow to bring it back to a 25mm focal length.


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