Which size do I need for my binoculars?
Measure the outer diameter of your objective barrels, not the aperture. The 50mm set fits 50-69mm, the 70mm set fits 65-89mm, and the 90mm set fits 85-109mm. Many 10x50 binoculars measure wider than 69mm across the housing and need the 70mm set, so measure before ordering.
How do I install the Universal Lens Filters on my binoculars?
Each filter ships flat and is designed to fold into a shallow cup. You shape it and press it over the front barrel of each objective lens, where the folded material creates a secure friction fit. Ensure both filters are snug and cannot be accidentally dislodged before pointing the instrument at the Sun.
Is the orange view from the Universal Lens Filter normal?
Yes, absolutely. The specific polymer used in this ISO-certified solar film is engineered to produce a pleasant, high-contrast orange-yellow image of the Sun. This is the standard appearance for most visual and photographic solar film filters.
Can I use these filters to photograph the Sun?
Yes. The film is rated at a neutral density of 5 (ND 5), which is safe for both direct viewing and imaging with DSLR or mirrorless cameras. Fit one filter over your camera lens, provided the lens barrel's outer diameter falls within the range of the size you ordered.
Are these filters safe for viewing a total solar eclipse?
Yes, for every partial phase. The film is certified to ISO 12312-2:2015, and the filters must stay on your optics whenever any part of the Sun's bright photosphere is visible. They may only be removed during the brief period of totality, and must go back on the instant the first sliver of Sun reappears.
How should I store the filters when not in use?
Unfold them and store them flat, ideally in the rigid mailer they arrive in, to protect the film from creases and scratches. Before every use, hold each filter up to a bright indoor light and inspect it for pinholes, scratches or tears. If the film is damaged in any way, discard the filter immediately.
