I use an SCT with a mirror diagonal in the *Northern* hemisphere and it
gives me images that are correct up and down, but left and right are
reversed. To set up guide I use the 'Mirror Image E/W' setting, and also
the 'RA/Dec (North Up)' setting as I have the scope polar mounted on a
wedge. The original post didn't mention the mounting method. This would be
different if set up Alt-Az.
As for the changes that are needed to do it South of the Equator... I would
be guessing. This is the proper method for North though, and if you can
flip the sky in your head you should be able to extrapolate!
Anthony J. Kroes
Cedar Drive Observatory
Pulaski, WI
-----Original Message-----
From: Arild Mikalsen [mailto:
arild.mikalsen@...] On Behalf Of Arild
Moland
Sent: Wednesday, August 13, 2003 2:28 AM
To:
guide-user@yahoogroups.com
Subject: Re: [guide-user] Inversion Settings
Hi,
> confirm what I should have the screen orientation/inversion settings
> set to so that what Guide shows me is oriented exactly the way I
> will see it through my EP. I am in the Southern Hemisphere, using
> an SCT with a standard Mirror Diagonal.
never been to the Southern Hemisphere, but I suspect that if your mirror the
image N/S, you'll be all set.
A SCT with a diagonal has got an odd number of reflections, which means that
up
in the sky is up in the eyepiece, whereas East and West flip sides in the
eyepiece, relative to the sky. And since East is to the Right "down under"
(when looking at the meridian), it will have to be to the left in your
eyepiece.
And that's exactly what you get by mirroring N/S.
Now, I only hope that this reasoning proves the preferred method of setting
up
Guide, rather than my lack of understanding ... :)
Someone will correct me, no doubt, if I'm wrong!
Best regards and happy observing!
Arild :)
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