Pirate Telescope

About printing：

This model was 3D printed in multiple colors. The largest lens barrel requires approximately 20 hours of printing time, while the total printing time is around 27 hours. For a faster alternative, consider monochrome printing and subsequent hand-painting.

I printed this model in multiple colors. The largest lens barrel takes 20 hours, and the overall printing time is about 27 hours. If you think the time is too long, you can try single color printing and coloring with paint.

About accessories：

You will need a set of lenses and a small amount of adhesive; no other components are necessary.

This is the link where I purchased the lenses (not an advertisement). The link leads to a kit; you only need the lenses from that kit, not the other included parts:

You need a set of lenses, a little glue, and no other accessories.

This is the link for me to purchase the lens (not an advertisement). The link contains a kit that only requires the lens to be used. Other parts are not needed:

https://item.taobao.com/item.htm?id=641527244791

About lenses (Optional Reading):

Aside from the aforementioned link, I haven't located any other affordable lenses with suitable specifications. The most prevalent sets of lenses on Taobao, commonly used in elementary school physics experiments, are inappropriate; Galileo lenses necessitate short barrels, and Kepler lenses produce inverted images—both unsuitable for this project.

Apart from this link, I couldn't find a cheap and suitable lens with appropriate parameters. The most commonly used set of lenses for elementary school physics experiments on Taobao is not suitable. The Galileo lens requires a short tube, and the Kepler lens shows inverted images, both of which are not suitable.

Should you wish to explore alternative lens solutions, or if you reside outside of China rendering the above link inaccessible, here is some pertinent optical information:

If you are looking for other lens solutions, or if you are not in China and the link above is not available in your area, here is some physics knowledge I know:

A telescope adhering to Galileo's principles produces an upright image. You require one convex lens (the objective) and one concave lens (the eyepiece). The focal lengths of these lenses are critical. Tube length = objective focal length - absolute value of eyepiece focal length (the focal length of a concave lens is typically negative). My assembled model, when fully extended, has a tube length of 290mm; the objective lens has a diameter of 42.5mm, and the eyepiece a diameter of 31mm.

A telescope based on Galileo's principle produces a positive image. You need a convex lens (objective) and a concave lens (eyepiece), and you need to pay attention to the focal lengths of these two lenses. Tube length= objective focal length - absolute value of eyepiece focal length (concave lens focal length is usually negative). After elongating my model, the length of the tube is 290mm, the diameter of the objective lens is 42.5mm, and the diameter of the eyepiece is 31mm.

Assembly instructions：