Schmidt-Newtonian collimation different?

[Kirkus (Kirk)]

I've become comfortable checking collimation on my Dob. But I'm wondering if collimation is done the same way on a Schmidt-Newtonian. I just bought a used 6" Meade LXD75 and after getting it home and looking through my site tube, the secondary was not centered at all to the focus tube. Anyway (I'm rambling)... I thought I'd read somewhere that the secondary mirror should be 1/8" off in two directions from regular newtonians??? Does that sound right?

I guess what I'm asking is can I collimate my new SN like I do my Dob?

[Tannehill]

Nils Olof Carlin has a section on Schmidt-Newt Collimation on his site, it might help....

http://web.telia.com/~u41105032/koll...i2.htm#schmidt

[Kirkus (Kirk)]

That's perfect! Thank you so much.

[Mark]

Originally Posted by Kirkus

I thought I'd read somewhere that the secondary mirror should be 1/8" off in two directions from regular newtonians??? Does that sound right?

I guess what I'm asking is can I collimate my new SN like I do my Dob?

The offset you mention is correct and should have been set in the factory. The end result is, once collimated, the secondary should look slightly egg-shaped when viewed through the focuser, with the larger 'lobe' of the 'egg' pointing towards the primary.

The link posted above is a good place to start.

Mark

[Kirkus (Kirk)]

Originally Posted by Mark

The offset you mention is correct and should have been set in the factory. The end result is, once collimated, the secondary should look slightly egg-shaped when viewed through the focuser, with the larger 'lobe' of the 'egg' pointing towards the primary.

The link posted above is a good place to start.

Mark

That's exactly how it looks, Mark. Thank you both for the info.

[William1]

Thank so much Dear. It might be helpful for me..







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