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Fantastically Easy to Use
I use this Focus Mask when taking astophotographs on my Meade LS-8 and it works like a charm. It's almost TOO easy to use! You simply focus on a bright star and place the Mask on the scope. Take a photo & examine the image. The 6-spiked star image will either be symmetrical, meaning it's in focus, or not. Just adjust focus and re-image until the central long spikes are exactly in the middle and the image is symmetrical. That's it!
Bahtinov Focus Masks...
• In 2008 an amateur telescope maker and astronomer ppublished an ingenious new way to easily focus your DSLR, webcam or CCD camera for taking astrophotos. The method is simple, very intuitive and the device has universally been named after the inventor. The Bahtinov Mask.
• Farpoint manufactures this *LIFESAVING* astrophotography tool out of virtually indestructable ABS plastic and comes in two major types and in a range of sizes.
• One mask is a general purpose mask designed to fit refractors and newtonian telescope. The other mask is designed to fit Schmidt Cassegrain telescopes. Both types of mask are available in a range of sizes to cover your needs.