Spectrum Telescope designs a full array of solar filters to suit your needs. This includes full aperture glass filters as well as threaded optical film filters. While a film filter is often a budget-friendly option, a glass filter is more sturdy; which type you choose depends on what you decide to use the Spectrum solar filter for. Both glass and film filters are white light solar filters. This means these are neutral density filters, and will not distort the colors visible. However, due to the nature of white light solar filters, over 99.99% of sunlight is blocked. These factors mean a white light filter will typically show the Sun white in color, although many show the Sun in a yellow-orange color that we are familiar with.
Although these filters block over 99.99% of the Sun’s harmful rays, they allow the full wavelength spectrum to shine through. This means you will see the Sun’s photosphere. The photosphere is often considered the easiest layer of the Sun to see because it generates the most amount of light. At this layer, you will be able to see sunspots, solar flares, and even granulation, the texture of the Sun’s surface.
Spectrum Telescope’s solar filters come in many sizes to fit your telescope or finderscope. You will find the full aperture glass filter anywhere from 41mm to 403mm. The threaded optical film filters are available in 37mm to 82mm sizes.
There are certain precautions you must take in order to safely view the Sun. Before viewing, always inspect your filters and accessories and do not use them if there is any sign of damage. Older solar filters recommend discarding the product after 3 years, as the filter gradually loses its effectiveness. However, this is not the case for many modern Sun-viewing accessories. Always consult an expert to confirm if you can safely use your older solar filters.