http://www.telescopebuyingguide.com/blog/how-can-i-decrease-a-telescopes-magnification-without-changing-the-eyepiece/ Thu, 17 May 2012 20:02:14 +0000 http://wordpress.org/?v=2.7 hourly 1 http://www.telescopebuyingguide.com/blog/how-can-i-decrease-a-telescopes-magnification-without-changing-the-eyepiece/comment-page-1/#comment-1616 Nyx Fri, 22 May 2009 08:27:18 +0000 http://www.telescopebuyingguide.com/blog/how-can-i-decrease-a-telescopes-magnification-without-changing-the-eyepiece/#comment-1616 The 0.5x variety will screw into the bottom of your eyepiece and work well. Shop around on line for the best price for you. the link below is just an example. The 0.5x variety will screw into the bottom of your eyepiece and work well. Shop around on line for the best price for you. the link below is just an example.

]]> http://www.telescopebuyingguide.com/blog/how-can-i-decrease-a-telescopes-magnification-without-changing-the-eyepiece/comment-page-1/#comment-1615 starryskyn Tue, 19 May 2009 00:34:54 +0000 http://www.telescopebuyingguide.com/blog/how-can-i-decrease-a-telescopes-magnification-without-changing-the-eyepiece/#comment-1615 There are "focal reducers" that shorten the focal length of refractors. This is the opposite of the Barlow lens. You can buy them, but they are specifically designed for particular scopes, and are expensive, probably more than what your scope costs. They come in 0.33, 0.50, and 0.63 power. Making your own is possible. If you get two long focus objective lenses (a pair of front lenses from 7x35 binoculars) held close together, curved side almost touching curved side, that would be a good one. You cannot use this on a mirror telescope like a Newtonian because there is not enough space between the small diagonal mirror and focusing eyepiece to put one. There is nothing you can do with the primary mirror to change the way it focuses light. There are “focal reducers” that shorten the focal length of refractors. This is the opposite of the Barlow lens.
You can buy them, but they are specifically designed for particular scopes, and are expensive, probably more than what your scope costs. They come in 0.33, 0.50, and 0.63 power.
Making your own is possible. If you get two long focus objective lenses (a pair of front lenses from 7×35 binoculars) held close together, curved side almost touching curved side, that would be a good one.
You cannot use this on a mirror telescope like a Newtonian because there is not enough space between the small diagonal mirror and focusing eyepiece to put one.
There is nothing you can do with the primary mirror to change the way it focuses light.

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