Astro Cards and Viewer
AstroCards are computer generated charts that cover the Northern Hemisphere to -40 degrees declination with a few special cards covering northern Centaurus. These finder charts have a uniform chart scale with each 3x5-inch data card showing the location of numerous deep-sky objects with 12 x 9 degree star fields.
Astro Cards help locate hundreds of interesting objects any time of the year. AstroCards are perfect for a portable telescope such as mine, because there is no need for accurate polar alignment, or the use of setting circles.
The cards are helpful even if you use computerized digital setting circles because of the DSC's limited accuracy in identifying objects in an area congested with numerous deep-sky objects such as in a galaxy cluster.
AstroCards also show objects that may not be included in some DSC databases, and they have no encoders to slip or stop working.
Astro Cards help you locate hundreds of interesting objects any time of the year. They are perfect for portable telescopes because there is no need for accurate polar alignment, or the use of setting circles.
I built my astro viewer from a re-cycled electronics module. I discarded the insides, and then cut a piece of Lexan plate to fit the top of the housing. I embeded a series of red LED's around the edge of the Lexan plate that are powered by two AA's located on the inside of the viewer.
The toggle switch at the top turns the viewer on, and the variable knob at the bottom varies the intensity of the LED's, depending on how bright you need the viewer set. The red glow at night illuminates the cards beautifully, and preserves your night vision.
The container I purchased from Staples, and it is a file box for 4"X5" file cards, the size of the Astro Cards.
If you wish here is where you can purchase a set of the Astro Cards along with a viewer.....