Sirius 3x Barlow Fully Multi-Coated with M42 Thread

Triple Your Magnification Without Sacrificing Clarity

Take your telescope's capabilities to the next level with this premium 3x Barlow lens, engineered for astronomers who demand more detail from every observing session. Whether you're tracing the rugged terrain of lunar craters, resolving the cloud bands of Jupiter, or splitting tight double stars, this accessory instantly triples the effective focal length of your telescope — effectively turning each eyepiece in your collection into two. It's one of the most cost-effective ways to expand your magnification range without investing in an entirely new set of eyepieces.

At the heart of this Barlow is a 3-element apochromatic (APO) optical design with fully multi-coated lens surfaces. This advanced configuration works to virtually eliminate chromatic aberration — the color fringing that plagues lesser Barlow lenses and degrades image quality at high magnifications. The result is razor-sharp, high-contrast views with faithful color reproduction across the entire field. Whether you're observing visually or capturing images, you'll notice a meaningful improvement in clarity and detail compared to standard single- or double-element designs.

Built to last and designed for versatility, the lens housing is constructed from high-quality aluminum with a durable black anodized finish that resists scratches and corrosion. The integrated M42 x 0.75mm thread serves double duty as a T-adapter connection point, allowing you to attach a DSLR or SLR camera body directly to your telescope with the addition of a camera-specific T-ring (sold separately). This makes it an invaluable tool for astrophotographers looking to capture high-magnification images of the Moon and planets without adding extra optical elements to the imaging train.

Ideal for:

• Lunar observation — explore craters, rilles, and mountain ranges in stunning detail
• Planetary viewing — resolve surface features on Mars, Saturn's ring divisions, and Jupiter's atmospheric bands
• Astrophotography — connect your DSLR or SLR camera via the built-in M42 thread for high-magnification imaging
• Expanding your eyepiece collection — effectively double the number of magnification options you have on hand