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  1. #1
    c0305's Avatar
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    Question Dummy Inherits Telescope and I need help!



    I got an old telescope from a family member who passed away and I didnt think it was all that interesting till I looked at the moon. Then I tried looking at everything in the sky and happened upon Jupiter. Now I am officially fascinated but have some questions.

    The telescope itself is at least twenty years old but in great shape. Its the kind where the eye piece sticks off the side of the tube. The tube being six inches in diameter.

    However I only have one lens for the telescope, a Celestron 25mm Kellner .96.

    Are there lenses that will be better for viewing planets?

    If so, where can I find some new or second hand that wont cost me a fortune?

    What do I need to look for in a lens?

    Finally, and this really doesnt belong in this forum but what heading from middle georgia do I need to look towards to find Saturn?

    Thanks in advance for any help.

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  3. #2
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    Congratulations! You've inherited a vintage Newtonian reflector.

    The 0.96 eyepieces are getting harder to come by, as the current standard includes 1.25" and 2" oculars. Having said that, they can still be found, but their rarity makes them a bit more expensive than a contemporary eyepiece in an apples-to-apples comparison.

    What is the diameter of your optical tube assembly? This will have a lot to do with what range of eyepiece focal lengths are useful for planetary viewing.

    You should obtain a copy of the freeware planetarium software known as Stellarium:

    Stellarium

    This will help give you bearings to the planets and stars for your latitude/longitude.

    For your location in the south, Saturn rises at about 2:58 am, and will be viewable almost due South on the horizon as it rises.

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  5. #3
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    Hi c0305, any relation to c3po?

    Looks like you have a 6" newtonian telescope. This is a great scope for a beginner, and will reveal many wonders in the sky.

    I will answer your last question first: Download Stellarium. It is a free planetarium program which is very intuitive to use, and will show you the sky in real time, right down to whether the Great Red Spot of Jupiter is visible. You just have to set it for your location.

    As for lenses, (we call them eyepieces), if your mirror is 6", (the tube would have to be slightly bigger) then your 25mm eyepiece gives you a magnification of 26x. The cheapest way to get another eyepiece is to purchase a 2x barlow. You can get them for anywhere from $20 to $200 (and up) There doesn't seem to be a significant difference between cheap and expensive ones. I would say that a $50 one would be pretty safe to purchase. You insert the barlow into your focuser, and put your eyepiece into the barlow, and your magnification doubles; in your case to 52x.

    Planets are generally viewed at higher magnifications. You can buy 3x and 4x barlows, which would give you 78x and 104x.

    I have a Celestron Zoom eyepiece, which goes from 8mm to 24mm. It gives me satisfying views and I recommend it to beginners.

    What kind of mount does your telescope have?
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    Uh-oh, I missed the .96 size spec. This limits your choices a lot. If you are at all handy, you may be able to replace the focuser with a more standard size one.

    Can you post some pictures?
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5;
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    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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  8. #5
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    "For your location in the south, Saturn rises at about 2:58 am, and will be viewable almost due South on the horizon as it rises."

    Austin, you meant east, right?
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    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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    Hi Co305 ...Thanks for joining us ....Those .965 eyepieces can still be had on the used market but it might be better to buy a .965 to 1.25 adapter ...Baader makes them and they can be had for around 25 dollars , then you would need to buy 1.25 eyepieces of course ...The way to figurer power is divide the number of the eyepiece into the F number of the telescope ..For instance your 25mm eyepiece into a 1000mm focal length would give you 40 power ..If you want to see things closer get a 10mm , that would be 100 power ....
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    I found a site which has several .965 eyepieces for around 25 dollars a piece and they had a zoom eyepiece for around 100 ... Want the link ?
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    Thanks a lot guys.

    My Optical tube assembly is an inch in diameter.

    I found .96 to 1.25 adapters on ebay for $7, will something like that work for me?

    And I will try to load some pics.

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    Quote Originally Posted by roverich View Post
    I found a site which has several .965 eyepieces for around 25 dollars a piece and they had a zoom eyepiece for around 100 ... Want the link ?
    Sure thanks a lot and thanks for answering my other question about the adapter basically before I could even ask it.

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    Quote Originally Posted by WWPierre View Post
    "For your location in the south, Saturn rises at about 2:58 am, and will be viewable almost due South on the horizon as it rises."

    Austin, you meant east, right?
    Yes - I stand corrected - easterly for rise time. I was looking at the transit and doing time-zone conversion in my head while distracted by SWMBO.... never good...

 

 
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