TeleVue 2x 2″ Big Barlow lens for Newtonian telescopes
Looking for a reliable way to double the magnification of your Newtonian telescope without buying new eyepieces? The TeleVue 2x 2″ Big Barlow lens is a precision-made optical extender that exactly doubles the effective focal length of your reflector - with the level of optical quality that TeleVue users have come to expect.
Designed specifically for Newtonian reflectors
Newtonian reflectors have specific requirements for accessories: a large field stop diameter, sufficient back-focus, and proper illumination of the light cone. The 2″ format with the "Big Newton" designation is designed to meet all of these conditions fully.
The large 2″ clear aperture ensures there is no unwanted vignetting, even with fast focal ratio telescopes (f/4 to f/6), where standard 1.25″ Barlow lenses often fail or noticeably restrict the field of view.
Practical 2x magnification factor
The 2x multiplication factor is a practical and well-balanced choice. It gives a noticeable increase in magnification without degrading image quality or demanding perfect observing conditions. Combined with your favourite 2″ eyepiece - or with 1.25″ eyepieces using a standard adapter - you effectively get double the focal length of your telescope.
Premium TeleVue optical quality
TeleVue Barlow lenses are consistently ranked among the best in astronomical accessories. Precisely ground and anti-reflection coated optical elements ensure minimal light loss, high contrast, and a sharp image all the way to the edges of the field of view.
For both visual observers and astrophotographers, the difference compared to cheaper alternatives is clearly noticeable - especially when observing planets, double stars, or fine surface details on the Moon.
Solid mechanical construction
The robust mechanical design with a precisely toleranced 2″ barrel diameter ensures secure and accurate seating in the focuser without any unwanted play or looseness. The overall construction is compact, so the effect on back-focus is predictable and easy to manage in practice.
Who is this Barlow lens ideal for?
This Barlow lens is the ideal choice for observers who:
- own a Newtonian reflector with a 2″ focuser
- want to get more from their existing eyepiece collection
- observe planets, double stars, or the Moon at high magnification
- use a small-chip camera for planetary photography
You effectively double your eyepiece collection without any compromise on image quality - whether for visual astronomy or planetary imaging.
About TeleVue
TeleVue is an American company with decades of experience in designing premium astronomical optics. Every product under this brand goes through strict quality control and is built to last through years of intensive use in demanding outdoor observing conditions. Choosing TeleVue means investing in optics that will not let you down - not today, and not ten years from now.
