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  1. #1
    ct sky's Avatar
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    Question help with a choice



    i am moving up to a bigger apperture tellescope and i dont know wether to buy an 8 in or a 6 in. the 6 in is more portable but i want to see deep into space. HELP!!!!

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    Default

    Hey CT,
    welcome to the site. Depends what type of telescope you want to use... A reflector would be quite heavy, and a refractor would be very very expensive in 6".

    However a SC or Mak-C would be much lighter (a tad more expensive) and would let you see more with an 8 inch scope.
    Name: Gus OTAs: ED 100 PRO refractor, Orion ST80 (not the CF), 8" Dob stuck in Canada Mounts:HEQ5PRO Synscan mount, Manfrotto Tripod CAMS: Guidecam Philips SPC900 webcams (4), Canon unmodded-450D DSLR

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    Default

    Hi ct sky,

    Welcome to Astronomy Forum.
    If it were me I would select an eight inch telescope.

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    ... aperture (almost) always rules ... especially when hunting the fuzzies ...

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    Hi ctsky welcome aboard , A 6in. mirror gathers 28 sq.in. of light as a 8 in. mirror gathers 50 sq. in. of light . almost double . So it will let you see fainter objects .
    16in Night sky
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    F4.5 , 90mm refractor 500mm FL , 7in
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    Default

    Hi ct! The bigger the better,viewing,that is,,The largest scope you can handle,easy,the better,and deeper,you can see! I have an 8" now,but am saving,for an 11", you wouldn.t believe,the difference in the viewing!

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    I don't think that the 8 is that much less portable than the 6 (depending on brand). The Orion XT6 that I have has the same focal length as the 8. The only difference is larger diameter, slightly larger base, and a few extra pounds. Then of course there are the truss design which is very portable.

    Just realized I am speaking of dobs only. There may be huge differences when it comes to EQ mounts.

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    Don't focus solely on mirror size. The F-ratio is also a factor. A higher F-ratio means a longer tube which affects portability. It also affects the magnification and, I think also the field of view for any given eyepiece. Finally with a faster scope you have to be more accurate as respects collimation.

    Besides solid and truss tubes, There are also now split tubes which may have some of the advantages of truss ones (smaller and lighter pieces, but more of them) and of a solid tube (very quick and easy to set up).

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    Aperture always rule especially for the fuzzy stuff a lower F ratio gives you a wider field of view and would be more suitable for astrophotography if you decide to go that way.

    Try for an 8" scope with F9, that said it also depends on what type of scope

    SCT are far easier to use move around than Newts but are more expensive, refractors long term are generally better for AP but far more expensive

    So ask yourself

    1. What are my long term astronomy goals
    2. Will I go down the AP track
    3. How much money am I prepared to invest

    and research check at reviews do your homework so that you are not disappointed
    Last edited by trevorw; 03-15-2009 at 07:24 AM.

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    The meade dobs (truss) are f5 with a f ratio of f5 and a focal length of 1270mm on a 10in. a 8in is f6 with a focal length of 1219mm , and the 12in is f5 with a focal length of 1524mm . I was checking them out saturday at the local scope shop and the fit and finnish is very nice , they now have a quality2in. 10-1 microfocuser and roller bearings in the base plate for smooth movement from side to side . I almost bought a 12in model ..
    16in Night sky
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