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    Smile What would be the difference between a 16" dobsonian and a 16" Schmidt Cassegrain?



    alright,
    What would be the difference if you got a 16" dobsonian like the meade lightbridge and you got a 16" schmidt cassegrain like the 16” lx200, took off both their mounts, put them on some super crazy million dollar mount and then looked through them. Im really new to astronomy, so sorry if this is stupid or obvious.

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    Focal length , Size and weight would be the difference. The dobs would be heavier and you would need a ladder to look into the eyepiece.

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  4. #3
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    Quote Originally Posted by bgiaa1 View Post
    alright,
    What would be the difference if you got a 16" dobsonian like the meade lightbridge and you got a 16" schmidt cassegrain like the 16” lx200, took off both their mounts, put them on some super crazy million dollar mount and then looked through them. Im really new to astronomy, so sorry if this is stupid or obvious.
    I would think that looking through them, you would not see any difference, all other things being equal. But this is only speculation (or maybe an educated guess) from someone who has a 5" telescope, and has never looked through anything larger than 8".

    Welcome to the forum, btw.
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5;
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    Smile

    We all started at the same place in this hobby, at the beginning. Neither stupid or obvious are your questions, and we are here to help you with your answers, or help you to find them. I'll expand a little on Mr. Fogboundturtle's response.

    The Schmidt-Cassegrain (SCT) is a compound design optical system (you can do some research at Wiki for more info), so it has a much shorter tube but actually a much longer focal length than the Newtonian (Newt) reflector telescope which sits (in this case) in a dob mount.

    The reflector, as with the Lightbridge 16, has a much shorter focal length. This will give you much wider field views than the SCT.

    This is the principal difference you would notice at the eyepiece.



    Bob
    Last edited by BobDob; 08-04-2009 at 05:00 PM.
    6 inch F/5 GEM mounted reflector

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    So, why are they so much more expensive than the Dob? is it because the SCT is harder to make?

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    Smile

    Yes, they (the SCT's) are more complex optically, plus the GEM (German Equatorial Mount) is much more complex, as well. The beauty of the dob is simplicity and low cost per increment of aperture. You get stunning views, however there are some "tweaks" to be added for them to perform parallel with the SCT's, GEM mounted. Notably, these would include a tracking platform which can include go to or push to, or not.



    Bob
    6 inch F/5 GEM mounted reflector

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    Hi bbiaa1 ..Welcome aboard the forums ...As bob and the other previous posters were saying The major difference's are focal length 1830mm for the 16in.dob as opposed to the 16in Schmidt-cass being 4064mm focal length ...Thats more than double the focal of the dob ..The wide field views would be a lot better with the dob , but the views of the planets would be killer with the SCT . Another major difference between the two scopes are the construction ...The dobsonian scope has a base that is made out of particle board that has a melamine finish kind of like a Formica ..The telescope is made out of stamped steel with some aluminum and no electronics ...The SCT has an aluminum optical tube , Chrome steel legs on the tripod , aluminum fork's for the mount , white glass corrector plate , optical coatings And the electronics that go into these advanced scopes ...
    16in Night sky
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