Fixed Diameter 50mm to 225mm Aluminum Alloy Solar Filter Sun Film
Fixed Diameter 50mm to 225mm Aluminum Alloy Solar Filter Sun Film is a solar filter membrane designed for astronomical telescopes with apertures from 70mm to 152mm. It features a 5.0 optical density, high-density dual-sided coating, and aluminum alloy border for secure mounting. The filter enables safe solar observation by blocking harmful solar radiation while preserving true neutral white color without blue or orange tint.
- 5.0 optical density ensures complete blocking of harmful solar radiation for safe solar viewing
- Dual-sided high-density coating prevents streaks, blisters, and pinhole defects
- Aluminum alloy border provides durable, rigid mounting with screw and rubber fixation
- True neutral white color transmission without color distortion (not blue or orange)
- Compatible with telescopes having aperture sizes from 70mm to 152mm
- Multiple fixed diameter options (50–225mm) to match outer diameter of telescope hood
Technical features
- Optical density: 5.0 (blocks 99.999% of solar radiation)
- Dual-sided high-density coating prevents streaks, blisters, and pinhole effects
- Aluminum alloy border for structural rigidity and secure mounting
- Fixed diameter range: 50–225mm (each model has a specific range and through aperture)
- Through aperture sizes: 55mm, 75mm, 95mm, 115mm, 135mm, 155mm, 175mm, 200mm, 230mm
- Mounting method: screws and rubber gasket (±5mm installation deviation possible)
- Compatible with telescopes having aperture sizes from 70mm to 152mm
- Designed for front-end installation on telescope hoods or lens caps
Who it is for
- Amateur astronomers using refractor or reflector telescopes
- Science educators and school labs conducting solar observation sessions
- Astronomy clubs organizing public viewing events
- Distributors supplying solar filters for telescope accessory kits
Specifications
| Optical Density | 5.0 |
|---|---|
| Border Material | Aluminum Alloy |
| Fixed Diameter Range | 50–72mm / 70–92mm / 90–112mm / 110–132mm / 130–152mm / 150–172mm / 170–192mm / 190–222mm / 220–225mm |
| Through Aperture | 55mm / 75mm / 95mm / 115mm / 135mm / 155mm / 175mm / 200mm / 230mm |
| Mounting Method | Screws + Rubber Gasket |
| Installation Deviation | ±5mm |
| Color Transmission | True Neutral White (no blue or orange tint) |
| Compatibility | Telescopes with aperture 70mm to 152mm |
Use guide
- Measure the outer diameter of your telescope hood before ordering
- Ensure the measured diameter falls within the 'Can Be Fixed Diameter' range of the selected model
- Install the filter on the front of the telescope using screws and rubber gasket
- Never use without a properly fitted solar filter; direct solar viewing without protection causes permanent eye damage
- Replace if coating shows signs of damage, blistering, or pinholes
FAQ
How do I know which size to buy?
Measure the outer diameter of your telescope hood. Choose the model where your measured diameter falls within the 'Can Be Fixed Diameter' range.
What is the difference between through aperture and fixed diameter?
Through aperture is the opening size for light to pass through. Fixed diameter is the outer size of the filter, which must match the telescope hood's outer diameter.
Can I use this filter on a telescope with a 160mm aperture?
No. This filter is designed for telescopes with aperture sizes from 70mm to 152mm. A 160mm aperture exceeds the maximum supported size.
Is there a risk of eye damage if the filter is not perfectly aligned?
Yes. Always ensure the filter fully covers the front of the telescope. Any gap or misalignment can allow unfiltered sunlight to enter, causing permanent eye damage.
What is the installation deviation tolerance?
The installation size may vary by ±5mm due to the screw and rubber mounting system. Account for this when selecting the correct model.