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Silver aluminium ring holding yellow-orange solar film, adjustable for 70 to 90mm tubes

iOptron

iOptron 70mm Adjustable Solar Filter 70-90mm

SKU CH-WM72-5V697

An adjustable solar filter fitting 70mm to 90mm telescope tubes, blocking 99.999% of sunlight with Optical Density 5 for safe, detailed solar viewing

  • Safe solar viewing blocking 99.999% intense sunlight with SolarLite film
  • Natural yellow-orange solar image from Thousand Oaks Optical film not Mylar
  • Adjustable frame fits 70mm to 90mm telescope tubes securely
  • Optical Density 5 transmission rate 1/1000th of 1% for detail
  • Machined aluminum fixture lightweight durable flat surface prevents wrinkles

Solar filter for 70–90 mm tubes

The iOptron 70mm Adjustable Solar Filter fits most telescope tubes between 70 and 90 mm and some camera lenses. It uses SolarLite film from Thousand Oaks Optical to block 99.999% of intense sunlight for safe solar observation. The machined aluminium fixture is sturdy yet lightweight and its flat surface avoids the wrinkles common on thin-film filters. Buyers who need a filter for tubes outside this range cannot use this model.

Thermals noise and power

Passive optical filters generate no heat, produce no noise and draw no electrical power during use. The aluminium cell adds minimal mass to the front of the telescope and does not affect balance in normal operation. There are no moving parts or electronics to maintain.

Optical Density 5 transmission

The filter transmits 1/1,000th of 1% of incoming light, equivalent to Optical Density 5, and renders a natural yellow-orange solar image rather than a pale white one. This single specification determines whether the filter meets the safety standard required for direct solar viewing.

Highlights

  • Safe solar viewing blocking 99.999% intense sunlight with SolarLite film
  • Natural yellow-orange solar image from Thousand Oaks Optical film not Mylar
  • Adjustable frame fits 70mm to 90mm telescope tubes securely
  • Optical Density 5 transmission rate 1/1000th of 1% for detail
  • Machined aluminum fixture lightweight durable flat surface prevents wrinkles

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the adjustable frame on my 70mm telescope tube without light leaks?

Loosen the three thumb screws, slide the machined aluminum fixture over the tube until the SolarLite film sits flat against the dew shield, then tighten each screw evenly until the frame cannot rotate — overtightening one side first is the step that creates gaps.

When will the SolarLite film need replacement and how can I tell?

The impregnated polymer film resists pin holes and scratches indefinitely; inspect the flat surface before every session and retire the filter only if you see physical damage or coating degradation that lets unfiltered light through.

What limits continuous viewing at Optical Density 5 with 99.999% sunlight blockage?

Heat buildup in the telescope tube and eyepiece becomes the first practical limit; the filter itself transmits a steady 1/1000th of 1% of light, so observer comfort and instrument thermal stability dictate session length.

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