The Barlow Lens and Eyepieces
Here are a few things you’ll need to know and know how to do before getting started.
You should receive several different lenses for your telescope. Some you’ll use a lot and
some you’ll hardly ever use. The following explains what the pieces are and in what
order they should go into the telescope.
This the Barlow lens. It multiplies the magnification of the image. Generally it will say
something like 2X or 3X on the side of it, meaning that it multiplies the magnification by
that much. Sometimes it’ll just say “Barlow Lens”. Regardless it still does the same
thing.
Next will be the eyepieces. There are generally 2 different ones with a new telescope.
The eyepiece along with the focal length of the telescope determines the magnification.
Most the time they are 20mm and 4mm.
The eyepieces can fit directly into the focusing tube as well as into the Barlow Lens.
Regardless, you must have an eyepiece in to see anything through the telescope.
3X
