# Best Solar Filters for Safe Sun Observing (2026) Source: https://stargazernest.com/best/solar-filters Updated: 2026-09-15 Publisher: Stargazer Nest. Our score is an editorial rating out of 10 (fit 35%, features 25%, build 20%, value 20%), not a customer rating. Method: https://stargazernest.com/how-we-research#our-score A solar filter must fit over the front of your telescope so it blocks dangerous light before it enters the optics. Never use a small filter that threads into an eyepiece. Look for full-aperture white-light filters made from certified solar film or glass that meets the ISO 12312-2 standard, which shows the Sun as a safe, natural view of the photosphere and sunspots. The critical spec is a secure, snug fit over your specific tube diameter so wind cannot dislodge it. These filters suit anyone tracking sunspots, following the solar cycle, or preparing for a partial eclipse. A practical tip: measure your telescope's outer tube diameter carefully and pick a filter sized to slide on firmly, then tape or secure it before every session. Inspect the film for pinholes or scratches each time, and discard it at the first sign of damage. ## Picks ### 1. Thousand Oaks Optical 6"x6" Solar Filter Sheet for Telescopes, Binoculars and Cameras White Light Sun Viewing Our score: 8.6/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 9/10) Thousand Oaks Optical 6 x 6 inch solar filter sheet for making safe white light filters for telescopes, binoculars and cameras. Pros: - Sheet lets you build a custom full-aperture filter sized to your instrument - White light filter shows sunspots and eclipse phases safely when properly fitted - Works for telescopes, binoculars and cameras with one purchase Cons: - Must be mounted securely over the full front aperture, never used loosely or behind an eyepiece - DIY cell building takes care, and any pinhole or tear means the film must be replaced Details: https://stargazernest.com/product/B01770FDAC ### 2. Explore Scientific Sun Catcher Sun Filter for Refractors and 8 inch SC Telescopes Viewing the Sun in White Light Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) Explore Scientific Sun Catcher filter for refractors and 8 inch SC telescopes to view the Sun in white light. Pros: - Ready-made front filter avoids DIY film mounting mistakes - Designed to fit refractors and 8 inch SC telescopes securely - White light views show sunspots and solar eclipses safely Cons: - Fit depends on tube diameter, so measure your telescope before buying - Check the filter for damage before each use and never use a torn or scratched one Details: https://stargazernest.com/product/B07BZM6CFB ### 3. Celestron EclipSmart Safe Solar Eclipse Telescope and Camera Filter ISO 12312-2 Works with Telescope Spotting Scope DSLR Our score: 8.4/10 (Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10) Celestron EclipSmart safe solar eclipse filter certified to ISO 12312-2 for telescopes, spotting scopes and DSLRs. Pros: - ISO 12312-2 certification gives confidence for safe eclipse and sunspot viewing - Works across telescopes, spotting scopes and DSLR lenses - Ready-made filter avoids the risks of homemade film cells Cons: - Must match your front diameter, so measure the lens or tube before ordering - Only for white light viewing, so solar prominences will not be visible Details: https://stargazernest.com/product/B0CH45ZBKV ### 4. Thousand Oaks Optical SolarLite Solar Filter Film (ND 5) 3" (76mm) Square Piece for Telescope Sun Observation Our score: 8.3/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 9/10) Thousand Oaks Optical SolarLite ND 5 solar filter film, a 3 inch (76mm) square piece for telescope Sun observation. Pros: - ND 5 density is the standard safe level for direct white light solar viewing - 3 inch square piece suits small telescopes, finders and binocular objectives - SolarLite film gives a natural looking Sun image Cons: - Small piece only covers small apertures, so larger scopes need bigger sheets - Needs a secure homemade cell over the front of the scope before any Sun viewing Details: https://stargazernest.com/product/B06XYJDNSN ### 5. Thousand Oaks 4"x4" Solar Filter Sheet for Telescopes, Binoculars and Cameras Safe White Light Sun Film Our score: 8.3/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 9/10) Thousand Oaks 4 x 4 inch solar filter sheet for building safe white light Sun filters for small telescopes, binoculars and cameras. Pros: - 4 x 4 inch sheet is a handy size for binocular objectives, finders and small refractors - Safe white light film shows sunspots and eclipse phases once mounted in a proper cell - Lets you make a filter that exactly matches an odd-sized front aperture Cons: - Too small for most mid-size telescopes, which need a larger sheet or ready-made filter - Film must be taped into a secure full-aperture cell, since a loose sheet can blow off in wind Details: https://stargazernest.com/product/B00DS7IFQS ### 6. Celestron EclipSmart Safe Solar Eclipse Telescope Filter ISO 12312-2 Works with 127 and 130 Telescopes Sunspots Our score: 8.1/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10) Celestron EclipSmart ISO 12312-2 solar filter built to fit 127 and 130 telescopes for sunspots and eclipses. Pros: - Sized for 127 and 130 telescopes, giving a secure full-aperture fit - ISO 12312-2 certified material for safe white light solar viewing - Great for eclipses and tracking sunspots over several days Cons: - Limited to specific telescope sizes, so other scopes need a different filter - Needs a secure fit and a damage check every time before pointing at the Sun Details: https://stargazernest.com/product/B00019TT4I ### 7. Thousand Oaks Optical SolarLite Solar Filter Film (ND 5) Optical Polymer for Telescope Sun Viewing Our score: 7.9/10 (Fit for the job 9/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10) Thousand Oaks Optical SolarLite ND 5 solar filter film, an optical polymer sheet for safe telescope Sun viewing. Pros: - ND 5 optical polymer is designed for safe direct viewing when fully covering the aperture - SolarLite film gives a pleasing orange-toned solar disk - Sheet format lets you cut a custom filter for your instrument Cons: - Check the sheet size to confirm it covers your full aperture - Polymer film scratches and creases easily, so inspect it for pinholes before every use Details: https://stargazernest.com/product/B07X81QW2H ### 8. Baader Planetarium 2" 7.5nm Solar Continuum Filter Narrow Band Photosphere Filter for White Light Solar Observation Our score: 6.6/10 (Fit for the job 4/10 · Features and specs 8/10 · Build and materials 9/10 · Value 7/10) Baader Planetarium 2 inch 7.5nm Solar Continuum filter, a narrow band contrast booster for white light solar observing. Pros: - 7.5nm continuum passband sharpens granulation and sunspot detail in white light - 2 inch format suits larger diagonals, Herschel wedges and imaging trains - Baader Planetarium is a leading name in solar observing accessories Cons: - Not a safe solar filter by itself: use it only with a certified full-aperture filter or Herschel wedge - Adds a green tint and cost that casual eclipse watchers do not need Details: https://stargazernest.com/product/B002SYFGSM As an Amazon Associate I earn from qualifying purchases.