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Thread: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

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    Default if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times



    closer are you seeing things? basicly
    woops i meant basically

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    You would be seeing objects appear 1 1/3 times closer using the same magnification per inch of aperture. It is just the ratio of the larger diameter divided by the smaller diameter.

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    If I had a 6" I would jump to 10" if possible. There is huge difference then. I consider a 10" dob at the upper end for portability.
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    Quote Originally Posted by panhard View Post
    If I had a 6" I would jump to 10" if possible. There is huge difference then. I consider a 10" dob at the upper end for portability.
    Unless it is of a truss design, then they break down into a manageable size. My XX12 is just fine for transporting.
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    Default Re: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

    But does the xx12 take a lot of time time break down and build up?

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    Default Re: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

    Quote Originally Posted by Staceyy View Post
    closer are you seeing things?
    You are asking about the magnification. We don't have enough information to answer that, because the magnification depends on focal length, not diameter.

    If we assume that both scopes have the same focal ratio, then we know that the 8" has a focal length that is 1.33x that of the 6", so, for a given eyepiece, it will give 1.33x more magnification. If we don't know anything about the focal length or focal ratio, then the question is not answerable.

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    Default Re: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

    I can tell you from experience that jumping from a 6" to an 8" is hardly worth the trouble - not much difference. Jumping from 6" to 10" is big. From 8" to 10" is not a big deal either, but moving from 8 to 12 is big. This can go on forever, as you might imagine. You need at least 2 jumps in size (6 to 10, 8 to 12, 10 to 14 etc) to make a difference. The limiting factors are portability, weight, setup time, and of course, $$. Always $$
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    Default Re: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

    Quote Originally Posted by johnleveritt View Post
    Unless it is of a truss design, then they break down into a manageable size. My XX12 is just fine for transporting.
    agree - and i just got the carrying cases for mine

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    Default Re: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

    Quote Originally Posted by gus1911 View Post
    I can tell you from experience that jumping from a 6" to an 8" is hardly worth the trouble - not much difference. Jumping from 6" to 10" is big. From 8" to 10" is not a big deal either, but moving from 8 to 12 is big. This can go on forever, as you might imagine. You need at least 2 jumps in size (6 to 10, 8 to 12, 10 to 14 etc) to make a difference. The limiting factors are portability, weight, setup time, and of course, $$. Always $$
    agree - i just went from a 8 to a 12 and it is night and day

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    Default Re: if you have a 6 inch reflector , then buy an 8 inch dobsonian ..how many times

    Quote Originally Posted by gus1911 View Post
    I can tell you from experience that jumping from a 6" to an 8" is hardly worth the trouble - not much difference. Jumping from 6" to 10" is big. From 8" to 10" is not a big deal either, but moving from 8 to 12 is big. This can go on forever, as you might imagine. You need at least 2 jumps in size (6 to 10, 8 to 12, 10 to 14 etc) to make a difference. The limiting factors are portability, weight, setup time, and of course, $$. Always $$

    But the difference between the weight of a 6 inch and 10 inch for weight and portability is hugh and for some may well be off putting.

    Aperture is only part of it. I had an 8" Newtonian and went to a 10" Goto Dob and the weight between an 8" and 10" is also noticeable and the 8" was also more portable.

    I don't regret going from 8-10", can still see a lot more with the 10", goting from 8-12" would be to much weight and portability a lot less.

    You have to consider how portable you want your scope and weight difference, etc.

 

 
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