Comments on: Is my 75mm hand mirror suitable for a dobsonian telescope? http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/ Thu, 17 May 2012 20:54:54 +0000 http://wordpress.org/?v=2.7 hourly 1 By: R S http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/comment-page-1/#comment-2439 R S Sat, 20 Feb 2010 06:16:55 +0000 http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/#comment-2439 If you mean a hand/makeup/shaving mirror, then you are not the first person to try this. The first attempt to build a reflecting telescope by Niccolò Zucchi in 1616 was him trying to see an image made by one of these mirrors. It didn't work because it turns out a mirror has to have a curve that is 4 times more accurate than a lens. So no... won't work. Have a look at for Zucchi's story.<a href="http://www.prohomeschool.com/bob-jones-homeschool.htm"> R S</a> If you mean a hand/makeup/shaving mirror, then you are not the first person to try this. The first attempt to build a reflecting telescope by Niccolò Zucchi in 1616 was him trying to see an image made by one of these mirrors. It didn’t work because it turns out a mirror has to have a curve that is 4 times more accurate than a lens. So no… won’t work.

Have a look at for Zucchi’s story. R S

]]> By: Geoff G http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/comment-page-1/#comment-2438 Geoff G Fri, 19 Feb 2010 12:11:15 +0000 http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/#comment-2438 No. Too small, short focal ratio, spherical surface, second surface coating, inaccurate figuring and polishing. Instead:<a href="http://www.namingmybaby.com/"> Geoff G</a> No. Too small, short focal ratio, spherical surface, second surface coating, inaccurate figuring and polishing.

Instead: Geoff G

]]> By: Mez http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/comment-page-1/#comment-2437 Mez Wed, 17 Feb 2010 09:44:42 +0000 http://www.telescopebuyingguide.com/blog/is-my-75mm-hand-mirror-suitable-for-a-dobsonian-telescope/#comment-2437 Hi Altair, I am not sure what you mean by a "hand mirror". If you mean a mirror that you use for checking your appearance, then even if id was curved, the curvature would not be sufficiently consistent to be able to use it in a telescope.<a href="http://www.businessbrokersguide.com/sunbelt-business-broker.htm"> Mez</a> Hi Altair, I am not sure what you mean by a “hand mirror”. If you mean a mirror that you use for checking your appearance, then even if id was curved, the curvature would not be sufficiently consistent to be able to use it in a telescope. Mez

]]>