Question about Celestron FirstScope 76EQ (180 x 76mm) Telescope

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Am I supposed to see the cross in the centre of image on celestron 76eq

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  • Geoffrey White
    Geoffrey White Mar 05, 2012

    Not normally. Do you mean that you can see the spider holding the secondary mirror?Or that there is a cross hairs in the eyepiece view?

  • Steve bambrey Mar 08, 2012

    The spider, I guess I'm trying to zoom in to much, it's only when I'm trying to view planets, not sure how much or how little im supposed to see?

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You will see diffrection spikes when focused on a very bright object

http://www.goldastro.com/images/newtonian.jpg

and this can also appear around a bright planet. However it is very irritating, and to minimise it, make sure your scope is well collimated (optically aligned).

There is too much to collimation to include here, but there are many guides on the Net

http://www.cloudynights.com/documents/primer.pdf

http://www.atmsite.org/contrib/Carlin/collimation/

Posted on Mar 09, 2012

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