I had to close down the forum and foto sharing site because of a possible security breach and constant spam attacks.
The Yahoo user group has therefore been reborn and is available here
This is a movie I made with my £50 Canon A810 hooked up to my Nexstar 4SE. Best viewed in full screen.
I have been trying out my £50 Canon A810 camera for astro work. An early trial was to connect it to my Nexstar 4SE scope with a Skywatcher digiscoping bracket and the results were pretty good.
Here is a sample and you can see more of the image by clicking on it.
We had a good discussion on my old Yahoo user group about how to remove Netwon’s Rings from your h-alpha setups. I have condensed the results of our discussion here to help others with this problem.
Newton’s rings are caused by interference arising from internal reflections in your imaging train and look like this.
Newton’s Rings
User Robert suggested that the rings could be eliminated by slightly tilting the camera. I came up with a simple design sketch like so.
Users Robert, Mike and Jack then built test versions which seem to work very well. Jack’s version was used to re-image the above view to give this which is a dramatic improvement.
Newton’s Rings Eliminated by Dave’s Tiltometer
Robert and Jack produced pdf info and foto sheets for their tiltometers which are here.
Mike uploaded a range of fotos of his version and results which are here.
Our forum now supports TapaTalk which opens up all its features to iPhone, iPad, Android, Blackberry and Chrome mobile users.
I just added a new video and sharing area to this site here.
I have set it up so that you only need to join the support forum and you are then automatically registered on the sharing page.
I missed out an important step from the software manuals.
You should first remove any versions of my software that you installed from my Window Sill Observatory site. You can do this using your Windows Control Panel.
Note that this will not delete your settings files and they will still be usable in the new version.
I will update the manuals to reflect this.