Helios Glass Telescope Solar Filter
ND5-rated solar filter for telescopes with reflective-coated glass in an aluminum cell. Safe sun viewing and imaging of sunspots and eclipses. Customers report secure 3-screw mounting and good fit
Highlights
- ND5 solar safety rating
- coated glass with aluminum cell
- fits specified tube diameters
Pros
- ND5-rated blocks 99.999% sunlight
- high-quality coated glass
- secure 3-screw mounting
- fits multiple OTDs within range
Cons
- fits 4 7/8" to 5 1/8" (125mm to 130mm) optical tubes
- requires careful handling for safe use
Best For
Features
- ND5-rated solar filter blocks 99.999% of sunlight for safe solar viewing
- Helios Solar Glass with dual-sided reflective coating, mounted in an aluminum outer cell
- Clamp-on design secures to telescope objective with nylon thumb screws and felt tabs
- Fits optical tube diameter 4 7/8" to 5 1/8" (125–130 mm)
- Designed for observing and photographing the sun's surface features such as sunspots and eclipses
