Question about National Geographic 336Nc Deluxe Indoor/Outdoor Thermometer
Posted by Anonymous on
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Posted on Jan 02, 2017
Manufacturer is unknown for this scope, but it probably originates in China and is resold with the National Geographic brand name, 150$ seems a little high for a used one. I would probably price it at 100-125$ depending on the condition and the included accessories, if any.
Posted on Jul 27, 2010
SOURCE: i need a manual for
You will not find a manual for that imported telescope. NEVER buy scopes from Ebay, craigslist, or any of the big box stores unless you know what you are buying.
Most of them are imported and have NO CUSTOMER SUPPORT!
Posted on Sep 18, 2010
Do NOT attempt to look at the Sun through a solar filter! These can crack from the heat and you will be blinded instantly.
Most telescopes use a standard fitting eyepiece with a 1.25 inch outside diameter barrel. You can measure the mount where the eyepiece goes to make sure that yours is this size, then search on eBay or Amazon for "1.25 eyepiece" and you will find many available. None of these will be made by National Geographic, but any make will fit.
The other variable will be the focal length of the eyepiece, which is what determines it's power. The power of the scope will be the focal length of the main objective divided by the focal length of the eyepiece, so a 9mm eyepiece will give a higher magnification (and be dimmer and harder to focus and find objects) than a 20mm eyepiece. It is usual to have two or three different focal length eyepieces for viewing different objects.
You will find a large variation in prices, which is partly due to the difference in quality and type of construction of the eyepieces. Kellner eyepieces are simple and cheap, whereas Possl or orthoscopic ones are more complex and cost more. There are reasons why people will pay more for the better eyepieces. Avoid eyepieces marked with the letters "H" or "SR" before the focal length.
Posted on Jan 20, 2011
The NG76AZ is made by Citiwell, but the only manual I can find is on retrevo for the 114 (the adjustments are the same, though). If you have a specific question about using the scope, post it here or go to cloudynights-dot-com, it's a forum & they have a beginners area that's really helpful!
Posted on Dec 27, 2011
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