© Brooke Clarke 2009
This 2" F/10 Retractor kit was
to be part of the International Year of Astronomy
. "Nothing piques a child's interest in astronomy as
effectively as looking through a telescope she/he built
herself/himself." For $15 it's a great buy! They are
available from Galileoscope.org
The eyepieces are standard 1 1/4" so
you can use your existing eyepieces. I've read that there's not
enough focus range to allow a star diagonal to focus.
It may be that a European tripod would work if a 3/8"-16 was substituted for the 1/4"-20 nut for American tripods.
28 July 2009 - The two problems are:
- Focusing by moving the draw tube when viewing through the
eyepiece is OK, but it's much more difficult when a camera is being
- The Earth's spin causes any heavenly body to drift out of the field of view very quickly
28 July 2009 - Images taken by tying
Galileoscope to another astronomical telescope (at Paul's house) that is on a polar
aligned mount. When running this despins the earth.
Camera was the DSI
. Note the images are only using the scope body and objective lens. They have nothing to do with the eyepieces.
The images you see through the eyepiece are better than these
photos. It must have been quite a chore for Galileo to track
whatever he was looking at either by moving the scope or by holding the
scope still and tracking with his eye.
25 X Eyepiece
For either Galilean Eyepiece (19) or 2X Barlow (20)
- FirstScope Telescope (IYA2009)
(Model # 21024) - This is a 3" (300 mm FL , F/4) reflector for about
$50. It uses the Newtonian all mirror optical system and a
Dobsonian like mount. Has rack and pinion focusing.
An advantage of the Newtonina is that all wavelengths of light are
focused at the same plane (including near IR) which is impossible for a
scope with a lens in the optical path. The down side to the
Newtonian is that it needs to be collimated often. Uses standard
1 1/4" eyepices and comes with two eyepices (20 mm - 15X & 4 mm -
The light gathering depends on the unobstructed primary optic
area. The mirror area is 7 sq in, but they don't say what the
secondary mirror diameter is, assuming it's 1" then the unobstructed
area would be 6.3 sq in. In comparison the Galileoscope (2'
Refractor) has an area of PI, i.e. 3.14 sq in. So the FirstScope
has twice the light gathering power.
The optional $20 accessory kit includes:
- 12.5 mm eyepiece (24X)
- 6 mm eyepiece (50X)
- Moon Filter
- 5x25 finder scope
- CD-ROM (The SkyX)
- Nylon Carrying Case
This is what I call an orientation
sensor that's combined with a micro controller and a data base of
heavenly objects. It can tell you what you're looking at or
direct you to something you want to see.
My page for the SkyScout
. The Celestron SkyScout
Brooke's PRC68, Products for Sale, Personal Home Page
page created 27 July 2009