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Thread: Saturn in a Telescope

  1. #1
    MrMan's Avatar
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    Default Saturn in a Telescope



    I am having difficulty observing saturn and I have run out of options. I have only been able to see the cassini division ONCE at 200x magnification. Eversince then when I observe at 200x all I get is a blur. 100X is sharp in my 4.5 inch telescope but not large enough to see cassini division. I have tried night after night. I have cooled the scope down, observed when wind levels are low, even used a light shield to block excess light. I have run out of ideas. However when i observe saturn at low power 40/80x, i can see a band of light stretching accross saturn in a diagonal formation. I also spotted grit on my primary mirrior. Could this be the reason why i can't see it anymore. Could the band of scattered light be due to a dirty mirror ? STRESS . !

  2. #2
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    Default

    I make the assumption that you are using a 4.5 in Newt ....

    But even so 200x is MORE then I normally observe Saturn with on normal nights even in my 11 inch Sct.... I find myself viewing at 150-180x on most nights but yes I can clearly see the separation in the rings...

    Unless your mirror is truly really dirty I do not think that is your problem at all...

    Have you checked and doubled checked your collimation...have you preformed a simple star test ??? On great nights in General with a well collimated 4.5 inch Newt I honestly would expect it to be able to hit 200x ...but on nights where the seeing is not all that "hot" 150x would be about your scopes limits... The Position orf Saturn in the sky also makes a heck of a lot of difference...too low in the sky and you are looking thur a lot of "junk" in the atmosphere

    Bob G.
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    Default

    I'm going to go with Bob on this one. I have a 10" dob and 200X is more than I normally use except on an exceptional night. On those exceptional nights I catch glimpses of sights that I remember for a long time. Your best bet is on a perfect night when Saturn is as high as it gets, and when it is as close the earth as it gets. My understanding is that while some scopes can boast of great magnification 200X is normally about what the atmoshpere will allow.
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    Default

    I agree with what has been said above.
    When I got my telescope I looked at Saturn, but it was blurred. I checked the collimation the following night and it was out quite a bit. After fixing it the improvement was tremendous. The seeing that night was good as well. Since than I always check collimation after colmpleting the initial alignment.
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    Default

    yes i tested it on a star i think its called spicia (just below saturn) and it focuses into a sharp pinpoint. I think its collimation that has something to do with it. BTW that one time i saw cassini division in my 4.5 inch reflector, was it a bit of plasebo (I SPELT IT WRONG I KNOW)? Jupiter was fine a few months ago no problems with it. Mars I haven't seen. I would like to know what to expect when i see it cause I heard it looks terrible in a telescope

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    Plus its hard for me to observe at a variety of magnifications because i only have 2 eyepieces and a barlow lens. My focal length is 1000mm. My dialema is (10mm eyepiece + 2x barlow =blurry large image200x) (10mm eyepiece= medium slight crisp image100x) (25mm eyepiece+ 2x barlow =slight blurry due to poor barlow 80x) (25mm eyepieces= too small for saturn but very sharp 2-3 ,oons visible 40x). I can't be bothered to order them and the widescreen centre (astronomy shop in central london) sell their eyepieces overpriced (minimum £70 for ONE) and i can't find any shops in londomn which sell them. Are there any more?

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    Default

    I will have to go with what the others have said. I have a 4.5" scope as well as a 10". One mistake all us begginers make is thinking high power makes for better close up viewing, however this is not the case. In your words you indicate that with each step down in power the view gets clearer. Using my 4.5" scope and the 225mm or the 30mm eyepiece I can make out the moons, casini division andit is clear. Any more power and all is lost. I would check the colmination carefully and keep it at low power, wait for good viewing conditions. Get your eyes fully night adapted, and look closely and you should see better detail. Also in using a barlow the image probably will be darker and suffer some loss of quality. Take some time to get it right and be patient and it will come.

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    Default

    Magnification is the LEAST important quality for a telescope.Aperture and or quality optics is much more important than magnification.

    Like everyone else I usually stay around 150 power or LESS-- usually 80-100 power, while using any of my telescopes.
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    This is a little bit off topic, but you mentioned something about buying more eyepieces and their expense. I would suggest you take a look at the Celestron/Zhumell brand 8/24mm zoom eyepiece. First yes there are more expensive and higher end zooms out there, but for around $60.00USD you can't beat it. I bought one of these about a year and a half ago and although it is an inexpensive eyepiece, it's quality is very good.

    With a 8/24 zoom and a barlow, you in effect have the equivalent magnifications of a whole case of eyepieces. It is something you should consider while looking at eyepieces. I would buy it again and feel confident in recommending one to our forum members.

    Later when budget and availability allow, you can start to add specialty eyepieces and in the mean time have all the different focal lengths you need. Just an idea.

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    yes i do know that magnification is not everything but what i am saying is that i do not have a variety of it. i need something between 40 and 80x and 100 and 200x. i have been reading all the articles on the internet and magazines on twelescopes and it is only saturn i have had a problem with. the time i saw it it popped in for about 10 seconds then sort of spawned away. does grit effect it like i said before that band of light.

 

 
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