Tele Vue 3x Barlow - 1.25"

Apochromatic 3-Element Optical Design

Unlike a standard Barlow that uses a simple two-element design, the Tele Vue 3x Barlow employs a three-element, apochromatic layout. This additional lens corrects for chromatic aberration and other optical errors introduced by the magnification process itself. The result is a view with significantly reduced false color, enabling you to see the true hues of Jupiter's cloud bands and the subtle color differences in binary star pairs.

This design also maintains the eye relief and exit pupil characteristics of your eyepiece better than simpler designs. When you insert a 25mm Plössl, it performs like a high-power 8.3mm eyepiece, but you retain the comfortable eye relief of the 25mm. This is a critical advantage for observers who wear glasses or prefer the comfort of longer focal length eyepieces during high-magnification sessions.

Fully Multi-Coated for Maximum Contrast

Every air-to-glass surface in the 3x Barlow is multi-coated with Tele Vue's proprietary anti-reflection coatings. This meticulous process ensures that more than 99% of the incoming light passes through to your eye, preventing internal reflections that can wash out faint details. The practical effect is a darker background sky and a higher-contrast image, allowing you to pick out faint crater-floor details on the Moon or the delicate crepe ring of Saturn against the planet's glare.

Parfocal for Seamless Power Changes

The Tele Vue 3x Barlow is engineered to be approximately parfocal with Tele Vue eyepieces. This means that when you insert the Barlow and eyepiece combination into your focuser, the image will remain nearly in focus. This thoughtful design minimizes the need for large focus adjustments, saving valuable time in the field and allowing you to switch between low and high power quickly without losing your target.

Secure, Non-Marring Brass Clamp Ring

To protect your eyepiece investment, the Tele Vue 3x Barlow uses a brass compression ring instead of a simple set screw. When you tighten the lock screw, the soft brass ring gently and evenly squeezes the eyepiece barrel. This provides a more secure, centered grip that preserves perfect optical alignment and prevents the deep scratches and gouges that set screws inflict on your equipment.

Integrated 1.25" Filter Threads

The bottom of the Barlow's barrel is threaded to accept standard 1.25" astronomical filters. This allows you to add a Moon filter, a color planetary filter, or a light pollution filter to the Barlow itself. Any eyepiece you then insert will benefit from the filtration, saving you the hassle of threading and unthreading filters from individual eyepieces as you change magnifications.

Saturn's Division, Sharpened and Defined

The true test of a high-power accessory is how it performs on a challenging target when seeing conditions are favorable. With a quality 12mm eyepiece in a 4-inch refractor, providing 75x magnification, slide the 3x Barlow into the diagonal. The power jumps to 225x, and as your eye settles, the Cassini Division in Saturn's rings transforms from a thin, hazy line into a sharp, black gap. The Barlow's control of scattered light makes the separation distinct, a direct result of the multi-coated, 3-element optics at work.

One trade-off of this high magnification is a dimmer image and a greater sensitivity to atmospheric turbulence. On nights of poor seeing, the 3x amplification may be too much, and a 2x Barlow might provide a more stable view. This makes the 3x Barlow a specialist for nights when the atmosphere cooperates, rewarding your patience with moments of genuine resolution.

Choosing Your Magnification: Tele Vue Barlows and Powermates

Tele Vue offers several magnification options. Understanding where the 3x Barlow fits in helps in making the right choice for your observing style.

• vs. Tele Vue 2x Barlow: The 2x Barlow is a versatile workhorse, ideal for general-purpose use and a good match for most telescopes. The 3x Barlow is a more specialized tool, designed for when you need a significant jump in power for planetary observation or splitting tight double stars, and when seeing conditions permit.
• vs. Tele Vue 2.5x Powermate: The Powermate is a 4-element design that is more complex and specifically designed to be telecentric, meaning it keeps the light rays parallel. This is a critical feature for imaging and for use with hydrogen-alpha solar filters. For purely visual use, the 3x Barlow offers more magnification in a lighter, more affordable package, while the Powermate provides a higher degree of optical correction for imagers.