Barlow lenses are concave or negative lenses that amplify or magnify the image produced by your telescope. They work by lengthening the converging cone of light from the scope, effectively increasing its focal length. Barlows allow you to use your lower power eyepieces with their greater eye relief at higher magnifications. They are also useful for getting larger image sizes for astrophotography.
The degree of magnification is known as the magnification factor. For Barlows it’s usually in the range from 1.5 to 3 and the most common value is 2. Such a lens is described as a 2x Barlow and will double the power of your eyepieces. A typical Barlow has a two-element achromatic lens at the end of a barrel that is 1-1/4” in diameter.
The Celestron Omni 2x Barlow lens has all these standard features and more, offering a high quality, low profile design which permits crisp, clear, high powered observation of the moon, stars and planets without breaking the budget. Easy to install and use by inserting into the eyepiece drawtube of the telescope and with blackened edges to minimise internal reflection and glare, it provides simple, honest, Celestron quality as promised.
Celestrons premium quality 31.7mm achromatic Omni Barlow lens (#93326) is compact and lightweight. It is under 75mm long and is Multicoated