APM Barlow Lens ED 6.25x 1.25" (73353)

This photo-visual apochromatic 2.7x Barlow lens is designed with real ED glass to deliver exceptional optical performance. Specifically calculated for Newtonian telescopes, it corrects off-axis coma, making it particularly beneficial for manual Alt-Az Dobsonian users who require a coma-free view as objects drift across the field of view. With its modular design, it can also be configured to achieve a 6.25x magnification, making it ideal for high-magnification planetary imaging while maintaining a low f-ratio for high frame rates. The lenses are crafted from FK61 ED glass and feature broadband multi-coatings with over 99% transmission for outstanding clarity and contrast.

Specifications

• Capacity
  • Appropriate for telescopes: Newton f/4 - f/6
  • Connection (to the telescope): 1.25"
  • Connection (to eyepiece): 1.25"
  • Extension of focal length: 6.25x
  • Number of lenses: 2x2
  • Backfocus (mm): 84
  • Coating of optical system: Fully Multi-Coated (FMC)
  • Filter thread: Yes
  • Fully corrected field (mm): 14
  • Transmission: 99%
• Special features
  • Ring clamp: Yes
• General
  • Type: Barlow & Erecting Lenses
  • Type of build: Barlow Lens
  • Material: Aluminium
  • Weight (g): 1000