Astromania 1.25 High Precision Double Helical Focuser for Telescope Lenses/Finder & Guidescope

The Astromania Optics Double Helical Focuser is designed to address the common challenge of imprecise focusing, particularly when attempting to focus on planets, which can be an arduous task with many telescopes. This elegant solution seamlessly integrates with your existing focuser, requiring no additional effort on your part.

The focuser features a dual-threaded design, with one side offering an M31x0.5 male thread, including an adapter that provides a M31x0.5 female to M42x0.75 male thread. This versatility allows you to connect the focuser to your telescope using either the M31x0.5 or M42x0.75 thread.

One of the key advantages of this helical focuser is its fixed orientation. Unlike traditional focusers, the accessories, such as cameras, do not rotate when the focuser is adjusted. This ensures that the orientation of the image remains unchanged, providing a more stable and consistent viewing experience.

To aid in achieving the optimal focus, the focuser features a graduated scale that allows you to easily reference and return to your previously set focus position. This scale, similar to the markings on a ruler, moves the focuser in increments of approximately 0.05 mm, enabling precise and repeatable focusing.

The smooth and continuous focusing action of the helical mechanism, coupled with the anti-slip texture on the focusing knob, makes it easy to make fine adjustments, even while wearing gloves in colder weather. The accuracy of this focuser can reach 0.05 mm, with a focusing stroke of up to 10 mm, ensuring that you can achieve the sharpest possible focus on your celestial targets.

The focuser's 1.25-inch accessory collar, featuring a brass compression ring, helps to prevent damage to your expensive eyepieces or zenith mirrors, providing a safer and more secure connection. Additionally, the thread design helps to reduce the impact of stray light, improving image brightness and clarity by minimizing dark edges and enhancing the details at the edge of the frame.

This high-precision double helical focuser is an ideal solution for guider scopes, finder scopes, and telephoto lenses that suffer from sluggish focusing. By adding it to the end of a rack-and-pinion (R&P) focuser, you can upgrade your equipment and achieve more precise focusing, as long as your R&P focuser has an M42x0.75 male thread.

Constructed entirely of metal, the Astromania Optics Double Helical Focuser is built to last, providing a durable and reliable solution for your astrophotography and observing needs. Its compact design, with a minimum length of 46 mm and a maximum length of 56 mm, makes it easy to transport and integrate into your existing telescope setup.

In summary, the Astromania Optics Double Helical Focuser is an excellent choice for those seeking a precise and user-friendly focusing solution for their telescopes and telephoto lenses. Its innovative features and high-quality construction make it a valuable addition to any astro-enthusiast's equipment.

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