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SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"
SVBONY SV216 2X 4-Element Barlow Lens - 1.25"

SVBONY SV216 2X 4-Element Barlow Lens - 1.25"

par SVBONY
UGC SV-W9168A
CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00
Égalisation de prix!
  • 2x Magnification Factor
  • 4-Element Optical Design
  • 1.25 inch Barrel Size
  • 3-Screw Coaxial Clamping System
  • Fully Multicoated Lenses
En rupture temporaire
Alerte de retour en stock
Info disponibilité
Admissible à la livraison GRATUITE au Canada pour les commandes de plus de 500$.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • SVBONY SV216 1.25" 2X 4-Element Barlow Lens for Planetary Astronomy

    The SVBONY SV216 1.25" Barlow Lens doubles your telescope's effective focal length using an advanced 4-element optical design to maintain a flat, sharp field of view. Its coaxial clamp utilizes 3 M3x10 thumbscrews for precise optical alignment, and the barrel's M28.5x0.6 threads accept standard 1.25" filters for enhanced planetary contrast.

    4-Element Optics: A Flat Field for 2x Magnification

    Unlike standard 2-element Barlows, the SV216 uses a 4-element lens group to deliver superior optical correction. This design significantly reduces chromatic aberration and flattens the field, ensuring stars remain sharp points even at the edge of wide-angle eyepieces. Fully multicoated surfaces on all elements maximize light transmission for bright, high-contrast views of planetary details like Jupiter's Great Red Spot or the Cassini Division in Saturn's rings.

    Coaxial Alignment: The 3-Screw Clamping Mechanism

    The SV216 replaces the single-screw standard with a robust 3-screw clamping system. This design allows you to apply even pressure from multiple points, forcing the eyepiece barrel to align perfectly with the Barlow's optical axis. This coaxial alignment is critical for high-magnification imaging and viewing, preventing optical tilt that can soften an entire side of the image. A brass compression ring prevents the stainless steel thumbscrews from marring your eyepiece barrels.

    SV216 4-Element vs. Standard 2-Element Barlows

    A standard 2-element achromatic Barlow, like a Celestron Omni, is often lighter and more affordable, making it a common entry-level choice. However, the optical and mechanical design of the SVBONY SV216 provides distinct advantages for serious planetary observation and imaging.

    • Edge Correction: The SV216's 4-element design provides a flatter field, crucial for keeping details sharp across the larger sensors of modern planetary cameras or when using wide-field eyepieces.
    • Color Fidelity: By better controlling chromatic aberration, the SV216 minimizes distracting color fringing on bright targets like the lunar limb, Venus, and Jupiter.
    • Mechanical Centering: The 3-screw clamp of the SV216 offers superior optical alignment compared to the single-screw design common on most 2-element Barlows, preventing image-degrading tilt. The trade-off is weight; at 7.72oz (219g), the SV216 is substantially heavier and may require rebalancing your telescope.

  • What is the main advantage of the SVBONY SV216's 4-element design?

    The primary advantage of the 4-element design is superior optical correction compared to simpler 2-element Barlows. It produces a flatter field of view, meaning stars stay sharp closer to the edge, and it significantly reduces chromatic aberration (color fringing) on bright objects.

    How does the 3-screw clamp on the SVBONY SV216 improve views?

    The 3-screw clamp ensures your eyepiece or camera is held perfectly on the optical axis (coaxially). A single thumbscrew can push the eyepiece slightly to one side, creating tilt that degrades sharpness, especially at high magnification. The SV216's design provides even pressure for a more precise, stable optical train.

    Can I use filters with the SVBONY SV216 Barlow?

    Yes. The 1.25" barrel is threaded with standard M28.5x0.6 threads, allowing you to attach any standard 1.25" filter. This is ideal for using color filters to enhance planetary features or a UV/IR cut filter for imaging.

    Will the SVBONY SV216 work well for imaging Jupiter with my 8" f/10 SCT?

    Absolutely. An 8" SCT has a focal length around 2000mm. The SVBONY SV216 2x Barlow will double this to 4000mm (f/20), providing the ideal image scale for capturing fine detail in Jupiter's cloud bands with most modern planetary cameras. The flat-field 4-element design will keep the planet sharp across the entire sensor.

    Is the SVBONY SV216 a good match for wide-angle eyepieces in my fast Dobsonian?

    Yes, it's an excellent match. Fast telescopes (f/4-f/5) and wide-angle eyepieces are very demanding on optics. The SV216's 4-element design provides the necessary correction to control aberrations like coma and astigmatism at the edge of the field, which would be amplified by a simpler Barlow.

    Will I need to rebalance my telescope with the SVBONY SV216?

    Most likely, yes. The SVBONY SV216 weighs 7.72oz (219g), which is significantly heavier than a standard eyepiece or a lightweight Barlow. You should expect to adjust your counterweights or tube position to maintain proper balance, especially on smaller mounts.

  • Brand SVBONY
    Magnification Factor 2x
    Barrel Size 1.25 inch
    Lens Elements 4
    Lens Coatings Fully multicoated
    Filter Threads M28.5x0.6
    Compression Ring Yes
    Barrel Material Stainless Steel
    Barrel Type Straight Barrel
    Thumbscrews 3
    Thumbscrew Thread M3x10
    Insertion Depth 1.55 inch / 39.5 mm
    Length of Upper Body 2.34 inch / 59.5 mm
    Max Diameter 1.73 inch / 44 mm
    Net Weight 7.72 oz / 219 g
  • SVBONY Warranty Policy