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Astrophotography

Observational Astronomy looks at the the more practical aspects of astronomy, including the basics of astronomical telescopes and instruments, observation tips, photography and imaging, how to guides and tutorials and a guide to the nights sky. You will also find information and news about the various space telescopes such as Hubble and Spitzer.

The Danjon Scale
02/06/2010Observation Tips
The Danjon Scale of lunar eclipse brightness is a five-point scale useful for measuring the appearance and luminosity of the Moon during a lunar eclipse. It was proposed by André-Louis Danjon when he was measuring the Earthshine on the Moon.
Hubble’s Best Images: A Top 10
12/05/2009Astrophotography
On Monday May 11th, Space shuttle Atlantis with its seven-member crew launched from NASA's Kennedy Space Center on the final Hubble Space Telescope servicing mission. In this article we will look at some of the best images that Hubble has produced since it's launch in 1990 and what they mean for astronomers.
Everything should be made as simple as possible, but no simpler.Albert Einstein
How To Make and Use a Hartmann Mask
03/05/2009How-To Guides
The Hartmann mask and Scheiner Disk are simple devices for making focusing a lens easier. They require that you target is a point of light, such as a star or distant planet, therefore are no good for day-to-day use.
How To Calculate Star Trails
01/05/2009How-To Guides Tools
This star trails tool will give an estimate to how long an exposure you need for star trails to form at a given focal length and target declination.
How To Build a DIY Solar Filter
01/05/2009How-To Guides
This is a simple construction method for a diy solar filter to be fitted over the front of a camera lens. The filter in this case is a section of Baader film and is designed to fit the the end of a telephoto lens. Auto focus still functions correctly on my Canon EOS 350d.
How To Reduce Light Pollution in Photoshop
01/05/2009Image Processing Tips
A short tutorial which shows you how to effectively reduce light pollution and orange gradients in Photoshop using a few basic filters. The resulting images will have more definition to the stars and nebulas and be without the horrible orange hue.
How To Align and Stack Images in Photoshop
01/05/2009Image Processing Tips
Align and Stack images in Photoshop or similar graphics package, allows multiple photos to be combined and has the effect of increasing signal, while reducing noise.
Astronomy Filters
01/05/2009Equipment Reviews
Astronomy filters are used to eliminate unwanted light and bring out fine details of an object, be it planetary, lunar of deep space. Every object has a filter to best enhance observations.
45° Erecting Prism
30/04/2009Equipment Reviews
Tired of watching everything in reverse? Need a different angle from your focuser? Try a 45 degree erecting prism which will correctly orientate the image.
Telescope Afocal Adaptor for Cameras
30/04/2009Equipment Reviews
Using an Afocal Adaptor to connect your digital camera to your telescope and use an eyepiece for increased magnification.