Why the Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70 Caught My Eye
The celestial ballet of a solar eclipse is an event that commands attention, a rare cosmic spectacle that stirs a primal fascination. Witnessing such an event safely, however, requires specialized equipment, and for the 2017 eclipse, I found myself in need of a reliable way to adapt my existing Celestron refractors for solar observation. The Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70 presented itself as a direct solution, designed specifically for my Celestron PowerSeeker 70 AZ & EQ and Travel Scope 70 telescopes. Its promise of “Solar Safe” viewing and ISO compliance immediately signaled a commitment to safety, which is paramount when dealing with direct solar observation.
My existing setup, while excellent for terrestrial and nocturnal viewing, lacked the necessary protection for looking directly at the sun. I considered universal fit filters, but the thought of a potentially ill-fitting filter, especially during a high-stakes event like an eclipse, gave me pause. The idea of a purpose-built filter, integrating seamlessly with my Celestron optics, offered a much-needed sense of security. Upon receiving the EclipSmart filter, my initial impression was one of pragmatic design; it felt solid, well-constructed, and designed with a clear purpose.
Real-World Testing: Putting Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70 to the Test
First Use Experience
My first real test of this solar filter was during a period of intense solar activity leading up to the 2017 eclipse. I attached it to my Celestron PowerSeeker 70 AZ telescope. The process of attaching the filter was straightforward, thanks to the three Nylon safety screws that ensured a snug and secure fit. These screws are designed to thread into the telescope’s objective end, preventing any accidental detachment, which is a critical safety feature.
The view through the filter was immediately striking. The intense glare of the sun was reduced to a safe, manageable disc of brilliant yellow. The filter transformed my everyday refractor into a specialized solar viewing instrument without any complicated adjustments. I spent several hours observing sunspots and the general surface of the sun. The filter performed admirably, providing a clear and sharp image without any noticeable distortion or color fringing. There were no initial issues or surprises; it simply worked as advertised, which is always a welcome outcome.
Extended Use & Reliability
Following the eclipse, the Celestron EclipSmart Solar Filter continued to be a valuable tool for occasional solar observation. I’ve used it for several subsequent periods of heightened solar activity and during clear days when the sun was particularly prominent. Even after repeated use, the filter shows no signs of wear or performance degradation. The Celestron proprietary Mylar filter material has remained optically pristine, and the housing still fits snugly onto my telescopes.
Durability has been excellent. The filter has been exposed to typical outdoor conditions, including dust and varying temperatures, without any ill effects. Cleaning is simple; a gentle wipe with a soft, dry microfiber cloth is usually sufficient. I haven’t needed to use any cleaning solutions, which I appreciate, as I’m always cautious about damaging delicate optical coatings. Compared to some generic filters I’ve encountered in the past, which often showed signs of scratches or film clouding after minimal use, this Celestron offering has proven far more robust.
Breaking Down the Features of Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70
Specifications
The Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70 is designed to be a specific accessory for a range of Celestron 70mm refractors. Its external diameter is 105.1 mm, ensuring it covers the objective lens of compatible telescopes effectively. The internal diameter measures 100.6 mm, providing a substantial clear aperture for light transmission. The filter has a thickness of 22.9 mm, which contributes to its robust feel and secure mounting.
Crucially, the filter clear aperture is 42.0 mm, meaning this is the diameter of the actual viewing area through the solar film. The entire unit weighs a mere 29 grams (1 ounce), making it incredibly lightweight and unobtrusive on the telescope. The filter material itself is described as Celestron proprietary Mylar filter, a specialized material engineered for safe solar viewing. It secures to the telescope via three Nylon safety screws, a vital feature for preventing accidental detachment during use.
Performance & Functionality
The primary function of the Celestron EclipSmart Solar Filter is to provide safe, direct observation of the sun. In this regard, it excels. The Solar Safe filter technology, which includes ISO compliance and filtration of 99.999% of intense visible light, works precisely as intended. The image of the sun through the filter is a safe, comfortable yellow, allowing for extended viewing periods without eye strain.
Its main strength lies in its guaranteed safe direct solar observation capability. The independent testing by SAI Global Assurance Services and conformance to multiple international standards (ISO 12312-2, EN 1836:2005 + A1:2007, AS/NZS 1338.1:2012) provide immense peace of mind. The filter effectively blocks harmful infrared and ultraviolet radiation, protecting the viewer’s eyes. The only minor area for improvement, if one were to be critical, is that the filter’s design is highly specific; it’s not a universal fit and is tailored for particular Celestron models.
Design & Ergonomics
The design of this Celestron optic is highly practical and user-centric. Its black finish is understated and functional, blending well with telescope aesthetics. The integration with the telescope’s lens cap design for a secure fit is an ingenious touch, ensuring it doesn’t obstruct the view or feel like an afterthought. The three Nylon safety screws are a standout ergonomic feature; they are easy to grip and adjust, providing a firm connection without damaging the telescope’s finish.
The overall build quality feels robust, despite its lightweight nature. The proprietary filter material is housed securely within the casing. There’s no discernible play or looseness when mounted, which is crucial for stability and safety. The inclusion of a safety cap to protect the outer surface of the filter when not in use is a thoughtful detail that enhances the user experience and protects the investment.
Durability & Maintenance
The Celestron EclipSmart Solar Filter appears built for longevity, particularly given its intended use case which is typically event-driven rather than daily. The proprietary Mylar filter material is known for its resilience when handled properly. I anticipate this filter will last for many eclipses and solar observation sessions to come.
Maintenance is refreshingly simple. As mentioned, a soft microfiber cloth is usually sufficient for removing dust. The Nylon safety screws are unlikely to corrode or seize, unlike metal alternatives. There are no complex parts to wear out or break. The primary concern for any optical filter is preserving the integrity of the filter material itself; avoiding sharp objects, extreme pressure, or abrasive cleaning agents is key. Based on my experience, this filter is designed with that durability in mind.
Accessories and Customization Options
The primary “accessory” that comes with the Celestron EclipSmart Solar Filter is its integrated design and, more specifically, the three Nylon safety screws which are crucial for its secure attachment. There are no other included accessories in the traditional sense, as this is a highly specialized component.
Customization options for this particular filter are virtually non-existent, and that’s by design. Its strength lies in its specific fit for Celestron’s 70mm refractors, including the PowerSeeker 70 AZ & EQ models and the Travel Scope 70. Attempting to modify or adapt it for other telescopes would likely compromise its safety and effectiveness. It is designed as a direct, precise solution rather than a versatile, adaptable component.
Pros and Cons of Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70
Pros
- Certified Solar Safe: Meets ISO 12312-2 and other international standards for direct solar observation, providing excellent eye protection.
- Secure Mounting System: Features three Nylon safety screws that ensure the filter is firmly attached to the telescope, preventing accidental slippage.
- Optimized Fit: Specifically designed for Celestron PowerSeeker 70 AZ/EQ and Travel Scope 70 models, ensuring a snug and safe fit.
- High-Quality Optics: Utilizes Celestron proprietary Mylar filter material for clear, sharp views of the sun with minimal distortion.
- Lightweight and Compact: Weighing only 1 ounce, it adds negligible weight or bulk to the telescope.
- Includes Protective Cap: A safety cap protects the filter’s outer surface when not in use, extending its lifespan.
Cons
- Limited Compatibility: This filter is designed for specific Celestron 70mm refractors and will not fit other telescope models or diameters.
- Yellow Filter Only: Provides a yellow-tinted view of the sun; some users might prefer other color filters (e.g., white light) for different observational preferences, though yellow is standard and safe.
Who Should Buy Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70?
This Celestron EclipSmart Solar Filter is an absolute must-have for any owner of a Celestron PowerSeeker 70 AZ, PowerSeeker 70 EQ, or Travel Scope 70 telescope who wishes to safely observe the sun. It’s particularly vital for anyone planning to view a solar eclipse, transit, or sunspots. If you’re a beginner in astronomy or a seasoned observer looking for a reliable and certified solar attachment for these specific Celestron scopes, this filter is an excellent choice.
Individuals who own other telescope brands or models with different objective lens diameters should look elsewhere, as this filter’s specific design means it won’t fit. Those seeking a more universal solar viewing solution might consider a full aperture screw-on or clamp-on filter for their specific telescope size, though proper fit and secure mounting remain paramount. For owners of the compatible Celestron telescopes, no additional accessories are strictly necessary for safe solar viewing with this filter, beyond perhaps a sturdy tripod and a clear sky.
Conclusion on Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70
The Celestron EclipSmart Solar Filter, 70mm Refractor PS70AZ/EQ, TS70 is a highly specialized, yet exceptionally effective accessory for its intended purpose. It transforms compatible Celestron 70mm refractors into safe and capable solar observation tools. The peace of mind offered by its ISO compliance and Solar Safe technology, coupled with the secure Nylon safety screw mounting system, makes it an indispensable item for anyone with the specified telescopes looking skyward during daylight.
At its price point, the value proposition is immense, especially considering the safety it guarantees. It’s a small investment to protect your vision and unlock the wonders of solar observation. For owners of the Celestron PowerSeeker 70 AZ/EQ or Travel Scope 70, I wholeheartedly recommend this filter. It delivers exactly what it promises: safe, clear, and enjoyable solar viewing.