telescopeplanet.co.uk

Barlow Lens

  1. Bresser 3x Barlowlens Achromaat

    Current status: In stock

      (Write a review)

    • Affordable barlowlens for beginner telescopes and astrophotography
    • Multi-coated optics
    • Compatible with 1.25 inch telescopes

    £21.95

  2. Bresser 2x Barlowlens

    Current status: In stock

      (Write a review)

    • Barlow lens for duplication focal length
    • Optical design: achromatic
    • Suitable for 1.25 inch eyepieces
    • Multi-coated lens parts
    • 2x magnification

    £37.90

  3. Bresser SA 1.25 Barlowlens

    Current status: In stock

      (Write a review)

    • extra magnificatino
    • available in three models
    • High quality lenses
    • available for each 1.25'' eye piece telescopes

    This product has various models available.

    from £95.50

  4. Bresser SA 2'' Barlowlens

    Current status: In stock

      (Write a review)

    • Extra magnification for all 2 inch telescopes
    • Very easy to use
    • Contains 4 high quality lenses

    £159.50

Barlow lenses

The Barlowlens (named after its inventor, the English mathematician and physicist Peter Barlow) is a diverging (negative) lens, which is used to increase the effective focal length. This results in a higher magnification. Moreover, the Barlow lens is very easy to use as the Barlow lens can be placed directly in front of the eyepiece.

Calculating your magnification

Imagine you use a 10mm eyepiece with the focal point of your telescope being 1000mm. Now you have a standard magnification of 100x. With a 3x Barlow lens you will arrive at magnification of 300 x! This is a cost-effective way to achieve a better result. An additional advantage is the ‘flatter’ and sharper image produced by the Barlow lens. A minor drawback is the small optic angle inherent in higher magnifications.