Metaguide - -has anyone used this?

[h0ughy]

I was put on to this by a mate who swears by it for precise collimation, i was wondering who out there has used this and what were their results?

http://www.astrogeeks.com/Bliss/MetaGuide/ :shrug:

[Octane]

I've got it but never used it as it looks so complicated. :P

Regards,
Humayun

[h0ughy]

thanks Humayun, the guy who told me is very astute and is quite adept with most things.

[allan gould]

David
Funny you should post as I was going to try this tonight. Ill let you know how it goes
Allan

[Terry B]

I have an old version and have used it but since my scope rarely needs collimation I haven't used it for a while.
It entails putting a webcam in as the camera. I use a QHY5 and I don't think it is supported so haven't used it for over a year.
When I did use it I used an old webcam and it was very good at demonstrating the diffration rings.

[JD2439975]

Looks very interesting, shame it doesn't support the QHY5 though.

[allan gould]

David
Had a go with it as I wanted to check collimation (not the guiding function). It appeared to work well showing the airy rings with my video camera, but the atmosphere was really boiling and the red spot that shows collimation was hopping around. When the atmosphere settled the red spot settled in the centre of the stacked star. I had figured my collimation was pretty good but its focus dependant. The Bahtinov mask sure helped here and gave a definite focus point.

[h0ughy]

good to know Allan, cloudy and raining here -again, so be a while before i test it

[stevous67]

Okay, I'm bumping back into life an old thread on Metaguide.

Being in this game for a while now I never heard of this program before, but I wish I had! ANYONE WITH AN SCT like scope needs this software!

I confirm that within 30-90mins you'll have your scope precisely collimated. I say 30-90mins depending upon your speed of learning, general computer skills, and I suppose your eye to hand coordination. Once you are familiar with the program, I am sure you could do it within 30mins no problem.

I found the first time I used Metaguide I spent 30-40mins just working out the controls and reading Franks guide, the section on collimation. After that, I proceeded to follow the dancing red dot that shows which way to collimate your scope.

If you look to the link above, you'll find the software to download, and Franks guide PDF on how to use his software. Within his manual, you can jump straight to the collimation section to get going - this is what I did.

I don't want to try to explain how it all works, as Frank's guide does that well. But, to give you a broad overview, you'll be watching three (3) main items to achieve perfect collimation:

1. A main screen showing the bright star being used for the analysis

2. A smaller screen to the lower right that shows a magnified view of that star showing gradients of brightness in varying colours to show the central brightness of the star outwards, indicating coma and distortion. Accompanying this image is a small red dot. You'll be watching this dot's position to make your secondary movements.

3. Lastly, the FWHM measurement for general focus. This you just want to make the smallest possible by adjusting your focus position.

The overall process requires you:

1. to connect a webcam to your scope,
2. Set up your computer screen so you can see the main screen and the smaller screen with the dancing red dot whilst you stand at your scope to make the adjustments.
3. Move the star in the main screen the same direction the red dot is positioned by adjusting your collimation screws.
4. Before making a second adjustment, you must centre the star in the main window again.
5. The goal is to get the red dot stationary in the core of the star (in the lower right window).

As you get the dot central, insert a Barlow to increase magnification, and then start again.

Follow Frank's instructions to make your settings to your video camera.

I have a CDK and never had excellent collimation before, as it was always a little out. Checking my result in CCDIspector, I had zero tilt in X and Y planes, and about 3degrees tilt in the overall image (maybe my CCD).

I am very pleased with Metaguide - Thank you Frank!

Highly recommended!

Steve

[stevous67]

Bear in mind the previous posts are old, and the Metaguide software has evolved since then.

To improve performance, you can average the position of the red dot over time, say 20 or 50 frames, this helps dramatically with unsettled conditions.

Try it!

Steve. :thumbsup: