These guides I have written and posted on my main website where you can learn a lot more about astronomy and astrophotography.
Sun 3rd May 2009 - The Hartmann mask and Scheiner Disk are simple devices for making focusing a lens easier, especially a telescope.
Fri 1st May 2009 - How to build a DIY solar filter using a simple construction method which allows the filter to be fitted over the front of a camera lens.
Fri 1st May 2009 - How to effectively reduce light pollution and orange gradients in Photoshop using a few basic filters and layer adjustments.
Fri 1st May 2009 - Align and Stack images in Photoshop or similar graphics package, allows multiple photos to be combined to improve signal and reduce noise.