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Gnomon Astrotech Private Limited
location Janakpuri, Delhi

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Our Products

  1. Telescope 4 Products available
  2. Optical & Laser Instruments 2 Products available
  3. Mirrors 1 Products available
  4. Filters 1 Products available
  5. Lenses 1 Products available
  6. Telescope Accessories 1 Products available
  7. Binocular 1 Products available
  8. Puzzle Game 1 Products available
  9. Audio Video System 1 Products available
  10. Others Products 3 Products available

Lenses

Leading Manufacturer, Supplier & Retailer of Barlow Lens.

Barlow Lens

Barlow Lens
₹ 1,776 / Piece Get Latest Price

A Barlow is a negative (diverging) lens that is placed between the objective lens (or primary mirror from now on these words will be used interchangeably) and the eyepiece of a telescope. It increases the effective focal length of an objective lens, thereby increasing the magnification. The idea is that 2 eyepieces and a Barlow will give you the flexibility of magnification of 4 eyepieces, and will give higher magnifications with less powerful eyepieces.

What are its Advantages and DisadvantagesAssuming that the Barlow is a good one, the only disadvantage is a slight loss of light throughput this is of the order of 3%. The advantages are numerous:

  • Higher magnifications can be attained with longer focal-length eyepieces than would be possible without the Barlow. Short focal length eyepieces necessarily have optical surfaces that are more curved and therefore are likely to introduce more aberrations.
  • A Barlow increases the effective focal ratio of the objective. This gives a more acute light cone, which is less demanding of eyepiece quality because:
    1. Rays at the periphery of the cone are closer to being paraxial and thus are less subject to aberration.
    2. A smaller area of the field lens is used.
  • Many eyepieces have an eye relief (distance of exit pupil from eye lens) that is directly related to its focal length. For example, the eye relief of a Plssl is 0.73 its focal length. Thus, with these eyepieces, for a given magnification there will be greater eye relief with a barlow than without.
  • Many eyepiece types do not work well with short focal-ratio objectives. The Barlow effectively increases the focal ratio, allowing the eyepiece to work well.
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  • Gnomon Astrotech Private Limited (Gnomon Astrotech Private Limited)
  • DB-42-E-1440, LIG G8, Near Hari Nagar Clock Tower, Hari Nagar, Rajouri Garden, West Delhi, New Delhi - 110064, Dist. New Delhi, Delhi, Janakpuri - 110058, India
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