Any1 sells scopes under $300 [testing]
Posted: Tue Dec 07, 2004 5:47 pm
SingAstro
Singapore Astronomy Forum
http://www.singastro.org/forum2/
Any1 sells scopes under $300 [testing]
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Posted: Tue Dec 07, 2004 6:06 pm
Hi AGMI,
I'm sellin my computerized Meade ETX-60 telescope. It is good for newbies as it is easy to use, setup n operate. It short focal length give good view of Big DSO like M45, M42.
price$280. 8)
I'm sellin my computerized Meade ETX-60 telescope. It is good for newbies as it is easy to use, setup n operate. It short focal length give good view of Big DSO like M45, M42.
price$280. 8)
Posted: Tue Dec 07, 2004 6:07 pm
does it use the two-star alignent?
Posted: Tue Dec 07, 2004 6:10 pm
Yes.I'm including a homemade tripod in the package
Posted: Tue Dec 07, 2004 6:11 pm
might consider but...im worried it might be too small for my use cause i have a [cheap]60X700 scope which still works..and what is the FOV for this scope
Posted: Tue Dec 07, 2004 6:25 pm
To answer ur question.......
We need to clear some misconceptions.
I presume ur 60x700 scope u bought most probably is a Tasco or Bushnell. The cover of the box claims tat u can see lots of astro things n even have pics of colourful DSO on it.
Let me put tis crudely, the scope is a typical TRASH scope. Put it simply, it is a toy! :?
The optics of the scope is a 60mm objective, yes, but if u look closely u will notice a cunning aperture stop in it, why, to cover up for the poor optics design. Thus u are not really using a 60mm to observe! The mount most prob is a weak wobbly alt-azi mount, thus it is so bad tat u can only use the scope on the moon. 
On the other hand, the ETX-60 is a true 60mm with multi-coated optics. This coating reduces light lost by scattering.The scope is mount steady on a fork mount, and the goto will held u track object as it travels across the sky. Further more, I used the computerized programs like "tonight's best" to learn about constellations and DSO. Thus tis is a great scope.
We need to clear some misconceptions.
I presume ur 60x700 scope u bought most probably is a Tasco or Bushnell. The cover of the box claims tat u can see lots of astro things n even have pics of colourful DSO on it.
Let me put tis crudely, the scope is a typical TRASH scope. Put it simply, it is a toy! :?
The optics of the scope is a 60mm objective, yes, but if u look closely u will notice a cunning aperture stop in it, why, to cover up for the poor optics design. Thus u are not really using a 60mm to observe!
The mount most prob is a weak wobbly alt-azi mount, thus it is so bad tat u can only use the scope on the moon. On the other hand, the ETX-60 is a true 60mm with multi-coated optics.
This coating reduces light lost by scattering.The scope is mount steady on a fork mount, and the goto will held u track object as it travels across the sky. Further more, I used the computerized programs like "tonight's best" to learn about constellations and DSO. Thus tis is a great scope. Posted: Tue Dec 07, 2004 6:29 pm
actually,its neither tasco nor bushnell.. its far worse. i bought it for 47 bucks BUT ther is no aperture stop, the lenses are glass and it is pretty..usable
Posted: Tue Dec 07, 2004 6:31 pm
madein china, wobbly mount and dirty barlow lens and erecting eyepiece . used it for 2 months and i dismantled the whole thing to make a cardboard STR 
Posted: Tue Dec 07, 2004 6:34 pm
F.O.V= field of view
tis is dependent on the magnification and eyepieces u are using to observe.
When we talk about fov of an eyepiece. We are talking about the fov of the ep as a result of the number of lens and arrangement of the optical system in the ep.
Like Plossl and orthoscopic ep both have a 4 lens system in the ep. But due to optical arrangement of the eps, Plossl have a fov of 50 to 55 degrees. Orthoscopic have 45 to 50 degrees.
When we talk about true fov, we talk about the observable field of the eyepiece as a result of incoporating it in the path of the telescope system.
thus :idea: true fov= fov of eyepiece/magnification.
tis is dependent on the magnification and eyepieces u are using to observe.
When we talk about fov of an eyepiece. We are talking about the fov of the ep as a result of the number of lens and arrangement of the optical system in the ep.
Like Plossl and orthoscopic ep both have a 4 lens system in the ep. But due to optical arrangement of the eps, Plossl have a fov of 50 to 55 degrees. Orthoscopic have 45 to 50 degrees.
When we talk about true fov, we talk about the observable field of the eyepiece as a result of incoporating it in the path of the telescope system.
thus :idea: true fov= fov of eyepiece/magnification.
Posted: Tue Dec 07, 2004 6:39 pm
Just like I expected poor mount barlows and accessories. :idea: 
The eps are all the 0.965 inch type thus all virtually useless. The barlow is added to make it look more like a secientific instruments. :idea: :roll:
The eps are all the 0.965 inch type thus all virtually useless. The barlow is added to make it look more like a secientific instruments. :idea: :roll: