Full Aperture Solar Filter 173mm Inner Diameter 170mm

Full Aperture Solar Filter 170mm
Film diameter: Approximately 135mm/5.3”
Outer diameter: Approximately 173mm/6.8”
Inner diameter: Approximately 170m/6.69”
(Please measure the outer diameter of the telescope first. Choose the solar filter inner diameter a little larger than the outer diameter of the telescope).

Polymer film features:
Optical density 5.0
Solar transmittance 0%
Ultraviolet light blocked >99%
ASTM and ISO certified

NEVER take pictures of a solar eclipse without the aperture filter properly installed as otherwise it could cause permanent injuries to both your eyes and your device;
Filters that are damaged or separated from their mountings should be discarded;
ALWAYS turn around and put down your device for a rest after taking pictures of the sun or an eclipse and always limit your continuous viewing to three minutes at a time;
NEVER let minors take pictures of eclipses with aperture filters without supervision;
ONLY clean with a soft cloth or tissue and store them at a safe place;
Discard your aperture filters after 10 years of use.

Safety Tips for Observing Coming Annular Eclipse on October 14, 2023 and Total Eclipse on April 8th, 2024

The annular eclipse on Saturday October 14, 2023 will begin in the United States, traveling from the coast of Oregon to the Texas Gulf Coast. A partial solar eclipse will be visible in all 48 contiguous U.S. states plus Alaska. It will begin in Oregon at 9:13am PDT and will end in Texas at 12:03 pm CDT.

The total eclipse on Monday April 8, 2024 will cross North America, passing over Mexico, the United States, and Canada. A total eclipse happens when the Moon passes between the Sun and the Earth. The sky will darken as if it were dawn or dusk. The partial eclipse begins in Dallas, Texas at 12:23 pm CDT, the totality in Dallas begins at 1:40 CDT with the maximum totality at 1:42 CDT. Totality in Dallas ends at 1:44 pm CDT and the partial at 3:02 CDT. For Caribou, Maine, the partial begins at 2:22 pm EDT, the totality at 3:32 EDT.

During an eclipse, it is never safe to look directly at the Sun without specialized eye protection designed for solar viewing. When watching an annular solar eclipse directly with your eyes you must look through safe solar viewing glasses (“eclipse glasses”) or a safe handheld solar viewer at all times. Safe solar viewers are thousands of times darker and must comply with the ISO 12312-2 international standard.