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  1. #1
    stargazer1975's Avatar
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    Default Need some advice



    Im looking at purchasing a telescope, it will be my first. AS it is my first I have no idea what Im looking at. Here are the specs for the telescope. with these specs, how far out could I reasonably expect to be able to view ?


    Optical Design: Dobsonian Reflector
    Aperture: 76 mm (2.99 in)
    Focal Length: 300 mm (11.81 in)
    Focal Ratio: 3.95
    Eyepiece 1: 20 mm (0.79 in)
    Magnification 1: 15 x
    Eyepiece 2: 4 mm (0.16 in)
    Magnification 2: 75 x
    Celestron 114mm (4.5") PowerSeeker Reflecting Telescope / AZ Mount / 4mm-8mm-12.5mm-20mm-25mm / 3X Barlow
    Seben 150mm (6") Omni XLT 150 Reflecting Telescope / EQ Mount / 6mm-12mm-18mm-22mm-25mm / 2X Barlow / 1.5X Erecting / Moon Filter.
    Meade DS-90 (90MM) Reffractor W/ AutoStar

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  2. #2
    roverich's Avatar
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    Default

    Hi Stargazer ..Welcome to the forums ..Thanks for joining us and jumping in .. As far as your question goes ..The stars we can see at night are millions and millions of miles away ...But a decient scope will only show stars as sharp pin points of light .. The one you are looking at will be a good wide field scope ..
    16in Night sky Dobsonian F4.5 , 90mm refractor 500mm FL , 7in
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  4. #3
    stargazer1975's Avatar
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    Default

    so this one will be a wide field ? what measurement determines wide or narrow field of view ? and lets say I wanted to be able to photograph DSO's, what specs should I be looking for to do that ? Thanks for the help
    Celestron 114mm (4.5") PowerSeeker Reflecting Telescope / AZ Mount / 4mm-8mm-12.5mm-20mm-25mm / 3X Barlow
    Seben 150mm (6") Omni XLT 150 Reflecting Telescope / EQ Mount / 6mm-12mm-18mm-22mm-25mm / 2X Barlow / 1.5X Erecting / Moon Filter.
    Meade DS-90 (90MM) Reffractor W/ AutoStar

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    roverich's Avatar
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    Default

    A dob would not be able to photograph DSO's ..Quick shots of planets and the moon .. I am not a astrophotographer but from what i understand you have to have a tracking mount that can follow the object for hours on end .. A typical beginner scope will be in the 6in-8in range and have a focal length of 1000mm ..
    16in Night sky Dobsonian F4.5 , 90mm refractor 500mm FL , 7in
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  7. #5
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    Default

    Optical Design: Dobsonian Reflector
    Aperture: 76 mm (2.99 in)
    Focal Length: 300 mm (11.81 in)
    Focal Ratio: 3.95
    Eyepiece 1: 20 mm (0.79 in)
    Magnification 1: 15 x
    Eyepiece 2: 4 mm (0.16 in)
    Magnification 2: 75 x

    This is a tabletop scope for beginners, it is not powerful enough to give you better views than a decent pair of binoculars.
    The higher end magnification specified might give you a view of Orion Nebula and one or two clusters.
    If I was you, I'd save for something bigger.
    300mm focal length won't allow for much more than wide field
    NEQ6 Pro Mount.
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    Starshoot Autoguider.
    Saxon 100 f9 Apo. Saxon20x80 Binoculars. Meade ext 125 Mak

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    102 x F5 guide scope/wide field scope. 10x10 shed with dome. Sky watcher sky adventurer mount.

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  9. #6
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    Default

    Orion sells a scope very similar to this for about $50. It's called a "Fun Scope."
    Fly me to
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    , let me play among the stars -- Sinatra


    Older Discovery 12.5 solid tube dob,
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    120mm refractor, non-go-to mount, eyepieces are 40mm and 32mm Orion Highlights, 25mm and 10mm Orion stock, 17mm Sterling, 12.5mm Baader, and 7.5mm Orion Ultrascopic, all housed in 8X10 Sky Shed

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  11. #7
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    Default

    I agree with Jennifer , you would soon ( very soon ) tire of that scope IMHO.

    If you want to take images of DSO's then you really need to look at an Equatorial mount ( with tracking ) . As for scope , a nice fast focal length ( 750fl, f5 ish ) refractor scope would be a good start.

    That said I would leave the AP until you are familiar with the workings of the mount. For simple visual viewing , then aim for a larger sized Dobsonian, easy to use , affordable and pain free.

    Clear Skies

    Pete
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    10x50, 20x80 Bin's,
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    )
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    C80ED, C130 Reflector/EQ3 , Ep's 8mm - 24mm Hyperion Zoom, 40mm SP, 20mm Meade Pl, 10mm Pl , 9mm Meade Pl, Celestron 2x Ultima Barlows. SW Star Adventurer.

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  13. #8
    Bob327's Avatar
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    Default

    3 inch aperture focal ratio of 4 focal length of 300 mm means it will give you wide fields of view but definitely not much magnification about twice the power of a pair of binoculars...which honestly is just fine for a grab and go lets take a quick look at the moon etc telescope... BUT not for any serious "stargazing"... I know because i have a f/5 80 mm 400 mm small refractor piggybacked on my main scope in my observatory BUT only because it is great for open clusters and that is the only thing I use it for...

    BTW....You have two excellent dealers close to you....Company 7 in Laurel and Hands on Optics in Damascus... BUT without knowing your budget I can't tell you anything except I'd pass on the scope you posted...

    a 4.5 inch Orion Dob would be my first, off the top of my head suggestion, both of these dealers deal with Orion products if that makes any difference ...

    Bob G.
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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  15. #9
    AbbN's Avatar
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    Default

    Quote Originally Posted by Bob327 View Post
    3 inch aperture focal ratio of 4 focal length of 300 mm means it will give you wide fields of view but definitely not much magnification about twice the power of a pair of binoculars
    Bob G.
    Bob & Jennifer. Sears here in Canada has a 60mm Bushnell on for $120 that's good for "660x" magnification....and the box has a super picture of the Andromeda Galaxy on it - this is absolutely amazing

    Stargazer1975, I've just given you an example of what NOT to get suckered into getting. That deceptive picture on the box I mentioned was probably taken with the Hubble yet most parents & their kids expect to see that with scopes like this. As for the "660x" magnification , anything is possible on paper I suppose

    Good luck!

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    The Bible tells us God created the Universe; Science tells us how He did it; And through my telescopes I marvel at His handiwork

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  17. #10
    stargazer1975's Avatar
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    Default

    okay so let me see if Ive got this straight.

    1.) The focal length measurement is the "Field of View" right ? So is a larger number or a smaller number in that field better for viewing the outer solar system and DSO's ?

    2.) Apature is the size of the reflective surface, be it mirror or liquid or whatever ? Common sense tells me that bigger is better here right ?

    3.) Focal ratio is the ratio between the eyepiece and the main lens ? What is the significance of the focal ratio ?
    Celestron 114mm (4.5") PowerSeeker Reflecting Telescope / AZ Mount / 4mm-8mm-12.5mm-20mm-25mm / 3X Barlow
    Seben 150mm (6") Omni XLT 150 Reflecting Telescope / EQ Mount / 6mm-12mm-18mm-22mm-25mm / 2X Barlow / 1.5X Erecting / Moon Filter.
    Meade DS-90 (90MM) Reffractor W/ AutoStar

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