2007-04-02 09:41:44 · 3 answers · asked by Paternoster 1 in Science & Mathematics ➔ Astronomy & Space
A Barlow lens is a negative lens that increases the effective focal length of the telescope. An erecting eyepiece is a positive lens designed to turn the image upside down. When used in an astronomical telescope that normally shows things upside down, an erecting eyepiece shows things right side up. Both the Barlow and erecting eyepiece go in the eyepiece holder of the telescope and a regular eyepiece is then inserted into the Barlow or erecting eyepiece.
2007-04-02 09:50:36 · answer #1 · answered by campbelp2002 7 · 0⤊ 0⤋
Both go in the eyepiece holder. A Barlow lens can change magnification by sliding it up and down, making it similar to several lenses at once. I think all an erecting eyepiece does is flip the image.
2007-04-02 17:16:36 · answer #2 · answered by eri 7 · 0⤊ 0⤋
what the others have said is true, except that the Barlow lens is stationary, it ups the magnification of an eyepiece. an erecting eyepeice makes the image the right side up, and usually magnifies it a bit more to.
they both go in the eyepiece hole and then the eyepiece goes into them.
2007-04-03 04:31:06 · answer #3 · answered by Tim C 5 · 0⤊ 0⤋