Galileoscope

The Galileoscope is a small mass-produced refractor telescope, designed with the intention of increasing public interest in astronomy and science.

This means the Galileoscope can be used with relatively cheap extra eyepieces to produce magnifications up to 100, or even 200 times (with a 5 mm in combination with the included 2× Barlow lens).

[citation needed] It also utilizes achromat glass lenses in the objective-lens – the large 51 mm (2 in) one in front – as well as in the eyepiece (4 lenses of two types of high quality plastic, known as a Plossl configuration) to prevent chromatic aberration, producing a clearer image.

This is because single lenses, as are often used in cheap scopes, refract light of different colors in different angles (chromatic aberration).

The 4-lens configuration results in a telescope in some ways similar to Galileo's, with 17× magnification and a very small field of view.