Sky-Watcher Sun 70mm RF - solar filter holder for 70mm telescopes
Would you like to safely observe the Sun through your Sky-Watcher or Celestron Travel Scope 70mm telescope? This holder is exactly what you need as the foundation for building a reliable solar filter. It is a precisely manufactured ring with a pre-cut opening, into which you can easily fit a solar filter foil - for example the popular Baader Astro Solar foil - and create a fully functional solar filter perfectly matched to your instrument.
What is included and how it works
The holder itself does not include a filter foil - it is a high-quality plastic or aluminium ring with an opening sized precisely for 70mm optics. It is designed to sit firmly and securely on the telescope tube so it will not fall off during use or transport. The opening makes it easy to cut and attach Baader Astro Solar foil (or any other certified filter foil), and the finished assembly reduces sunlight to a safe level for both visual observation and photography.
Observing the Sun without a certified filter is extremely dangerous and can cause permanent eye damage. This holder combined with quality Baader foil forms a complete and proven solution used by astronomers all over the world. Baader Astro Solar foil has an optical density of OD 5.0 for visual use, meaning it transmits only 1/100,000 of sunlight - the ideal ratio for comfortable and sharp observation of the solar disk, sunspots, and faculae.
Compatible telescopes
The 70mm solar filter holder is designed for the following telescopes:
- Sky-Watcher telescopes with a 70mm objective lens
- Celestron Travel Scope 70
- Other telescopes with an outer tube diameter matching the 70mm specification
Before ordering, we recommend checking the outer diameter of your telescope tube at the objective end to make sure the fit is correct. The holder is designed with a slight tolerance that allows easy mounting and removal without damaging the tube.
Why choose a foil filter over a glass filter
The combination of this holder and Baader Astro Solar foil is an economical yet optically high-quality solution. Compared to ready-made glass filters, a foil filter offers excellent contrast and neutral colour rendering of the solar disk. Both images and visual impressions are sharp, with no unwanted colour reflections. For astronomers who want to follow the solar cycle, observe planetary transits, or watch solar eclipses, this combination is the ideal starting point.
Compact and travel-friendly
The holder is lightweight, compact, and easy to store - it fits together with the telescope into any travel bag. This is especially appreciated by owners of the Celestron Travel Scope 70, who take their instrument on trips and want to be able to observe the Sun anywhere in the world.
About Sky-Watcher
Sky-Watcher is one of the most important telescope and astronomy accessory manufacturers in the world. Their accessories are designed with a focus on precise fit and long service life, while remaining very affordable. If you own a Sky-Watcher telescope, original accessories from the same brand guarantee the best compatibility and reliability - exactly what astronomers need when observing under the open sky.
Technical overview
| Parameter |
Value |
| Compatible objective diameter |
70 mm |
| Compatible telescopes |
Sky-Watcher 70mm, Celestron Travel Scope 70 |
| Recommended foil |
Baader Astro Solar foil OD 5.0 |
| Foil included |
No |
| Material |
Plastic or aluminium |
| Use |
Visual observation and photography |
| Brand |
Sky-Watcher |
