| Revision as of 20:35, 26 November 2009 editTrilobitealive (talk | contribs)Extended confirmed users, Pending changes reviewers6,230 edits →See also: * List of telescope parts and construction← Previous edit | Revision as of 14:20, 28 November 2009 edit undoJim.henderson (talk | contribs)Autopatrolled, Event coordinators, Extended confirmed users, IP block exemptions, Pending changes reviewers, Rollbackers72,749 edits Standing on her head; not lying on her sideNext edit → | ||
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| | Standard | | Standard | ||
| | Straight through | | Straight through | ||
| | Upside down and reversed (i.e. rotated |
| Upside down and reversed (i.e. rotated 180 degrees) | ||
| |- | |- | ||
| | Right-angle | | Right-angle | ||
Revision as of 14:20, 28 November 2009
A Finderscope is a small auxiliary telescope mounted atop the main astronomical telescope and pointed in the same direction. The finderscope usually has a much smaller magnification than the main telescope can provide and therefore can see more of the sky. This helps in locating the desired astronomical object in the night sky. Some finderscopes have crosshairs to mark exactly where the main telescope is looking.
Finderscopes usually come with a designation of the form AxB, where A is the magnification and B is the aperture of the finderscope's objective lens in millimeters; for example, a 6x30 finderscope means a finderscope with a 30 mm objective and a magnification of 6x. This designation is in the same format used by most binoculars.
A 6x30 finderscope is the minimum useful size for a finderscope on an amateur telescope, and an 8x50 or larger finderscope is preferred. Many inexpensive telescopes come with 5x24 finderscopes or smaller, and in some cases the true aperture is even less due to the presence of an internal aperture stop.
Most finderscopes have one of three viewing orientations:
| Type | Eyepiece mount | Image orientation |
|---|---|---|
| Standard | Straight through | Upside down and reversed (i.e. rotated 180 degrees) |
| Right-angle | 90 degrees | Backwards (mirror-image) |
| Correct orientation | 90 degrees | Correct |
See also
References
- "The Backyard Astronomer's Guide", by Terence Dickinson and Alan Dyer.
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