A Barlow lens extends the focal length of the telescope. This increases the magnification of the telescope. The Barlow lens is placed between the telescope and the eyepiece or camera.
With a Barlow lens, long-focus eyepieces can be used to achieve high magnification. Compared to short-focus eyepieces, these eyepieces usually have a longer eye relief (good for eyeglass wearers!) and better viewing comfort.
This High-Power Barlow has an enhanced 4-element lens design that minimizes chromatic and spherical aberrations and preserves sharpness and contrast. Images appear flatter, sharper, and better color-corrected than with standard achromatic Barlows.
