Question about Optics
I have an old brass telescope on a tripod and the lenses are eihter not in alignment or some may even be missing
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: 40mm tasco refractor telescope.
Can you remove the eyepiece from the telescope--- if you can -- GOOD, throw it away and buy a new one on-line at these web sites--
Eyepieces come in 3 different barrel sizes-- .965, 1.25, 2 inch
Yours is probably either a .965 or 1.25 inch.
Posted on Jan 03, 2009
SOURCE: misplaced lenses
You don't need to get Vivitar brand eyepieces to get replacement ones for your telescope. I'm not sure of the specifications for this particular telescope but in general they come in two barrel sizes for the eyepieces. The diameter of your eyepiece is probably 0.965" but could come in the more standard 1.25". You can measure the diameter and determine this quickly.
Once you know the diameter to shop for you can look for the focal length of the eyepiece you wish to purchase. They are rated such as 4mm, 10mm, 25mm, etc. The smaller numbers give you higher magnification. You can calculate the magnification by dividing the telescopes focal length by the eyepiece focal length. For example, let's say your telescope is has a focal length of 360mm and you have an eyepiece rated 10mm. Divide 360 by 10 and that gives you a magnification power of 36.
You can find eyepieces at many telescope dealers on the internet. Your selection will be far less if you use 0.965" eyepieces. You can purchase 0.965" to 1.25" adapters so that you can use the larger eyepieces with your telescope. However, on some telescopes the adapters will cause the new eyepiece to not come into focus.
You'll also find that eyepiece prices go all over the place. A good general purpose eyepiece is a type called the Plossl. The better eyepieces have more coatings too that allow more light to get through to your eye. You'll find these listed with terms like "fully multi-coated".
I hope this helps.
Good luck and clear skies!
Posted on Mar 26, 2009
The eyepieces have numbers written on them-- the bigger the number the LOWER the magnification. Start with the eyepiece with the BIGGEST number-- practice focusing the scope during the daytime on a distant object..,..... once you do.. switch eyepieces .... and see how much closer everything looks.
Try for the moon as your first target at night--- you can download a free star chart at www.skymaps.com
Posted on May 17, 2009
You can buy tripods at several places on the internet--
Here are two--
Posted on Jun 19, 2009
Here is the Meade manual web site. Find your telescope and see if a part is missing.
and here is their customer service phone number:
Posted on Aug 30, 2009
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