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image size...what to expect?
I recently purchased a Celestron - NexStar 114 GT from Costco for $198.00
with a $40.00 instant rebate. I felt I got a good deal on this scope. After the first use...I have to say that I'm disappointed with the size that Mars appeared. Slightly larger than the eraser on a pencil. I used the standard 10mm eyepiece which gave me 100X. I thought I would be able to see the Polar Ice caps etc. Is there a better eyepiece that will give me a larger image with better detail? Honestly, my binoculars and spotting scope were almost as good as this scope....am I doing something wrong? |
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Bakenshake wrote:
I recently purchased a Celestron - NexStar 114 GT from Costco for $198.00 with a $40.00 instant rebate. I felt I got a good deal on this scope. After the first use...I have to say that I'm disappointed with the size that Mars appeared. Slightly larger than the eraser on a pencil. I used the standard 10mm eyepiece which gave me 100X. I thought I would be able to see the Polar Ice caps etc. Is there a better eyepiece that will give me a larger image with better detail? Honestly, my binoculars and spotting scope were almost as good as this scope....am I doing something wrong? Well, 100x is a little on the low side for viewing Mars, even with it being as close as it is now. A pencil eraser is about 8mm across, so to have Mars look at 100x the size of a pencil eraser, that eraser would be about 65.7 cm (or about 25.9 inches) away from your eye. You would need probably 200x to get a better view with that scope, but even then, Mars will still look fairly small. There are eyepieces which will yield such powers, or you can insert a 2x Barlow lens in the scope ahead of the eyepiece to get the magnification you need. Clear skies to you. -- David W. Knisely Prairie Astronomy Club: http://www.prairieastronomyclub.org Hyde Memorial Observatory: http://www.hydeobservatory.info/ ********************************************** * Attend the 10th Annual NEBRASKA STAR PARTY * * July 27-Aug. 1st, 2003, Merritt Reservoir * * http://www.NebraskaStarParty.org * ********************************************** |
#3
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On Wed, 27 Aug 2003 03:30:12 GMT, "Bakenshake"
wrote: I recently purchased a Celestron - NexStar 114 GT from Costco for $198.00 with a $40.00 instant rebate. I felt I got a good deal on this scope. After the first use...I have to say that I'm disappointed with the size that Mars appeared. Slightly larger than the eraser on a pencil. I used the standard 10mm eyepiece which gave me 100X. I thought I would be able to see the Polar Ice caps etc. Is there a better eyepiece that will give me a larger image with better detail? Honestly, my binoculars and spotting scope were almost as good as this scope....am I doing something wrong? Hmm lets see you are looking at an object Smaller than Earth 35 Million miles away, just how big do you want it? -- --- The two most abundant elements in the universe are Hydrogen and stupidity. Why is the ratio of Hydrogen to Stupidity less in usenet than anywhere else in the universe? |
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