Galileoscopes at the Manila Observatory

Genie Lorenzo invited me to join her and six Ateneo undergraduate students in assembling Galileoscopes owned by the Manila Observatory.

I brought Eddie (my cute little red Astroscan telescope) with me and used it to show the moon and Jupiter to the students; while Genie demonstrated to them how to use the Galileoscope (she has already completed one Galileoscope).  According to her, the Galileoscope included two eyepieces and a barlow that could magnify objects by 17x and 50x. All of us were given a chance to see the moon and Jupiter using this telescope. I was amazed with its capacity to clearly resolve the moon’s craters and Jupiter’s bands and moons despite its small aperture.

After a short introduction about the telescope and a review of optics, we started building our Galileoscope. It took us more than hour to finish and we honestly had a hard time building it. The manual’s instructions were a bit confusing and the pieces looked all the same. We also don’t recommend it to elementary students who still lack basic background in Physics and Optics. Therefore, building a Galileoscope should be for students in secondary and tertiary levels.

To see the step-by-step procedure, you may watch this video from Youtube:

Genie took our pictures while we were busy figuring out how to put together the Galileoscope:

In the end, all of us were successful and immediately used the telescope for stargazing.

To the stars!


~ by Stella's Gaze on December 31, 2010.

7 Responses to “Galileoscopes at the Manila Observatory”

  1. Hi again ms. Erika. I have a question about telescopes. I’m trying to make a home-made telescope using the lenses of magnifying glass with different focal length. but the the image I get is always upside down. do you know if it’s really possible to use magnifying glass lens on making telescopes?thank you very much..

  2. Hi Kayoyama,

    I haven’t tried making a home-made telescope so I’m not sure if I’ll be able to give a good advice. As I’ve read from the internet, it is really possible to use magnifying lens on making telescopes, but you should note the focal length of the glass lens to do this. If the distance between your object and your lens is smaller than the focal length of the lens, you’ll get a smaller and inverted image.

    There is a computation to get the focal length of the lenses. Kindly check:

    You can also read and get tips at How Stuff about building a telescope at home (

    I hope this helps. 🙂

  3. Hi Ms. Erika,

    Is Galileoscope already available na dito satin? If yes, where can I buy one kaya?

    Many Thanks.

  4. Hi! =) Is the Manila Observatory is open to the public? Say for example, we want to do some stargazing? Do we need to ask permission formally or something? =)

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