Question about Tasco Astronomical 302675 Telescope
Hi, I have a problem with my Tasco telescope, I removed the objective lens to clean it, but I didn’t pay attention to the order, and now I can´t re assemble it. I have two lenses and a plastic ring. Can you provide me with a picture or diagram of how it should be assembled?
This is an air separated doublet (invented in the 1700s). Each lens element is made of a different type of glass to reduce false color. So if you get it back together wrong you will notice the bad image. Look at the edges of the elements the thinner one usually goes in front. The concave surface of the rear element should also face front. With the plastic separation ring in place the convex surface of the front element should not come into contact with the rear element's concave surface. It shouldn't rock, there should be about 1mm air separation between them. On shorter focal length refractors (under 500mm) the front surface of the front element has less concavity that the rear surface. On longer focal lengths they are about the same. All I can say is try this and if the image isn't that great flip the front element and try it that way. And don't feel too bad we've all learned the hard way to mark the edges of the elements as we take them out. HTH
Posted on Jan 07, 2009
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