Thousand Oaks Optical6"x6" Solar Filter Sheet for Telescopes, Binoculars and Cameras

The best time for a person to directly view solar flares and coronal discharges from the surface of the sun is during a solar eclipse where the daytime Moon covers the body of the Sun, a very happy coincidence, allowing the activity of the Sun extending past the outside of its body to be more easily seen. But if you want to see solar flares you are going to need some magnification compared to just ordinary Sun safety eclipse glasses. That's where this large 6 by 6 inch (15.24 centimeters) sheet comes in.You would normally think that since you are collecting more light then concentrating it to a smaller area you might be subject to damaging concentrations. And the answer is yes, you will be much safer to capture any activity on film-stills or video.According to Wikipedia, "X-rays and extreme ultraviolet radiation emitted by solar flares are absorbed by the daylight side of Earth's atmosphere and do not reach the Earth's surface. Therefore, solar flares pose no direct danger to humans on Earth." and "...the duration of a flare ranges from approximately tens of seconds to several hours with a median duration of approximately 6 and 11 minutes..." depending on which wavelengths are measured.According to the National Oceanic and Atmospheric Administration, We are now in Solar Cycle 25 with peak sunspot activity expected in 2025. While we are not predicting a particularly active Solar Cycle 25, violent eruptions from the Sun can occur at any time. For the latest space weather forecast, visit NOAA’s Space Weather Prediction Center, the nation’s authority for space weather alerts, watches, warnings, and advisories.Suggest you either video or take periodic still photos of the entire eclipse process over its approximately to two and 1/2 hour time from start of partiality to end of partiality or for the length of the total eclipse which will probably be about 4 minutes in your area of the United States.In Conclusion: highly recommend this product to let you do that safely.

This worked very well. I was able to DIY a filter for my camera lens for the 2024 total solar eclipse. I even had enough left over to DIY filters for three iPhones.

Put this on the front of my telescope and looked at the sun a couple of times. Saw the sunspots clearly and have not gone blind. Works as advertised.

For the price and make two sheets would have been optimal and fair. Otherwise it works and is a solar watching a beast. It has has the typical NASA spec orange/yellow color. Unfortunately. It block 60% of visible photons. Which means it's not as great as a screw on filter lens. but way cheaper with the same fun.

Buen filtro

I ordered one size too small, but I can work around it. Otherwise I am quite pleased with this product. I have tested the film and it does filter the sun properly so that viewing the sun can be done safely. About the only thing that can be seen through this filter is the sun itself, and you can see the sunspots, eclipses, etc. This solar optical filter arrived in good condition and on time.My advice is if you order this film you will need to make a mount for it to attach it to your telescope. Many people apparently tape it to the telescope, but I plan to make a mounting with screws to hold it on, and with Plexiglas lenses to protect the film from damage. By making a more permanent mounting my plan is to be able to use the solar optical filter over and over again whenever I need it. The design I've come up with has the film sandwiched between the two plate discs of the Plexiglas, which will be attached to the mounting by screws through the Plexiglas into the mounting. The mounting itself will slip over the outside of the telescope and will be secured with set screws. I'm a woodworker and my neighbor is a machinist, so I'm debating on whether I will make the mounting using wood or have my neighbor mill an aluminum one.Important notes:1. This solar optical filter film is intended to be used over the aperture (largest opening) on the telescope. Do not use it to make an eyepiece or in the eyepiece part of the telescope.2. It is best to order a size larger than the aperture of your telescope. The film is square, not round. My telescope aperture is 6" and the film I ordered was 6" by 6". I should have ordered the 8" by 8" or even the 10" by 10". The 6x6 leaves small gaps where it doesn't cover the opening. To solve this problem the mounting I'm making will have some material sitting inside the aperture.

This was probably a once in a lifetime opportunity to catch a full solar eclipse and this stuff worked just fine. I bought a couple blanks and made custom filters for both my SLR camera and telescope.

I purchased this for the October 14, 2023 annular solar eclipse. At the time, I was planning on cutting the filter into a circle to fit on my polarized filter for me lens. When I received the filter, I realized that I would only have one shot at cutting the filter correctly as my lens filter is 95mm and the filter was not big enough for a second try. And I didn't have the time to order a new filter if I screwed up. As I was gathering the courage to grab my razer blade, my dogs wanted a treat, and I decided on peanut butter crackers. As soon as I opened my pantry door, the box holding the crackers pretty much slapped me in the face as an easy way to create a filter. And it worked very, very well. Thanks to this great solar filter sheet and my dogs, I got some great photos of the eclipse!