TS-Optics Optics TSB51 Apo Barlow Lens 5x - 1.25 inch - apochromatic - compression ring

♦ 5x the focal length and magnification

♦ 3 lens apochromatic element

♦ Fully multi-coated lenses with blackened edges

♦ Barrel size 1.25"

♦ All metal design, short length

♦ Precise lock by brass compression ring


Apo Barlow 5x - 1.25"

For high magnifications, like for observing moon and planets, you need to use short focal length eyepieces. These are often either very expensive or have a very narrow eye relief, making them rather uncomfortable to use.

For astro-imaging with a large magnification you can do eyepiece projection, but this offers only a limited sharpness throughout the photographical field.

The TS Optics APO Barlow lens is the ideal alternative for both applications.

Fields of Use:

The large magnification factor 5x turns for example a 25 mm Plossl eyepiece into a 5 mm eyepiece, while retaining the comfortable eye relief of the longer eyepiece. This is very comfortable for observing planets.

For high magnification astro-imaging, like for webcam imaging of the planets, you could use eyepiece projection photography. The better alternative is the 5x Barlow lens because it offers a better field sharpness than typical eyepiece projection. Experience shows that for planetary imaging an effective focal ratio of f/25-f/30 is ideal. As a result this Barlow is the perfect match for most Newtonian telescopes.

The Lens Element:

The three-element Barlow lens is fully multi-coated for a bright and high contrast image.