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Telerad reflex Telescope Finder (projects red lite circles) - $30 (Harvest)
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Used , but in Good Condition. Works well
Mounts on telescopes with 2 sided tape.
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Here's a description from the manufacturer:
"The Telrad is the best-selling non-magnifying finder for Dobsonians, equatorial reflectors, refractors, and Schmidt-Cassegrains alike.
The Telrad projects a bull's-eye pattern of concentric red rings (4 degrees, 2 degrees, and one-half degree in diameter) on a tilted clear viewing plate at the top of the finder. These circles, which seem to be projected on the sky itself, make it easy to starhop from object to object.
If a galaxy is 10 degrees north of a known star, for example, two 4 degree Telrad jumps and one 2 degree jump from the known star will take you to that galaxy in seconds. The half-degree circle makes it easy to quickly center a computerized scope on guide stars for start-up alignment, and to center on planets, comets, and deep space objects if you're scanning the sky manually.
The red circles can be seen from virtually any distance behind the Telrad, from two inches to two feet, so eyeglass-wearers can easily use the finder.
The Telrad is normally used as a straight-through finder, similar to the heads-up display in a military aircraft cockpit. Its base attaches quickly to any optical tube 6" and larger in diameter by means of double-faced tape (or by screws into a Sonotube reflector optical tube, through two screw holes in the mounting plate).
The finder itself fits into a dovetail slot in the base and locks in place with two finger-tighten side screws. The Telrad comes with one base standard, but additional bases are available so you can put a base on each scope you own and use one Telrad on several scopes.
Collimating knobs at the back of the Telrad allow you to line up the finder with your main scope optics. An on/off switch and integral rotary brightness control allow you to match the finder brightness to your eye's dark adaptation. The Telrad uses two 1.5V AA batteries.
The Telrad is 8" long by 1.75" wide by a maximum height of 5", so it is difficult to use on the short and small diameter optical tubes of small scopes such as the Meade 3.5" ETX-90"
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