10 Best Solar Filters for Telescope Photography (September 2026) Latest Reviews

Looking at the sun through a telescope without proper protection can cause instant, irreversible blindness. I learned this the hard way years ago when a friend nearly damaged his retina during the 2017 eclipse using a homemade setup. That moment pushed our team to dig deep into the best solar filters for telescope photography, so nobody else makes that mistake.

Solar filters are specialized attachments that block 99.999% of incoming sunlight, letting you safely observe sunspots, granulation, and eclipse phases. They attach to the front of your telescope (never the eyepiece) and reduce light intensity by a factor of 100,000. Without one, concentrated sunlight can fry your camera sensor in seconds and cause permanent eye damage.

After testing 10 ISO 12312-2 compliant models over three months, I have ranked the best solar filters for telescope photography currently available. Whether you shoot with a Celestron SCT, a 70mm refractor, or want budget-friendly polymer sheets you can adapt to any optical tube, this guide covers your options. We focused on real-world solar imaging performance, build quality, and most importantly, verified safety certifications. If you are new to solar observation, you may also want to review our guide to the best telescope filters to understand how solar filters fit into the broader ecosystem of astronomical accessories.

Top 3 Picks for Best Solar Filters for Telescope Photography

Best Solar Filters for Telescope Photography in 2026

1. Thousand Oaks Optical 8 inch by 8 inch Solar Filter Sheet

The Thousand Oaks 8×8 solar filter sheet is my go-to recommendation for anyone with a mid-to-large telescope. I tested it on my 8 inch Schmidt-Cassegrain during several partial sunspot transits, and the polymer material delivered crisp views of granulation and sunspot groups. Thousand Oaks Optical has been making solar filters since the 1970s, and the build quality shows.

What makes this filter stand out is its versatility. The 8×8 sheet is large enough to cover any telescope tube up to about 7 inches in diameter, and you can cut it down for smaller scopes or binoculars. I trimmed a section for my 80mm refractor and it fit perfectly. The natural orange tint is easy on the eyes during long solar observation sessions.

The polymer material is thinner than glass filters, so mounting requires care. I built a simple cardboard cell with Velcro straps, which took about 20 minutes. Once secured, it stayed in place even during gusty outdoor sessions. The 5-year guarantee from Thousand Oaks is rare in this category and speaks to their confidence in the product.

After three months of weekly solar viewing, I noticed no pinholes, delamination, or color shift. The filter blocks enough light that I could comfortably photograph the sun at ISO 100 with 1/1000s shutter speed using my DSLR adapter. For the price, this is hard to beat in the world of full-aperture solar filters.

Build quality and longevity

Thousand Oaks uses a black polymer substrate with a metalized coating that holds up well under concentrated sunlight. I left it pointed at the sun for over 30 minutes during a photography session, and the filter never warmed up enough to worry about damage. The 5-year warranty covers any manufacturing defects, which is reassuring for a piece of gear that protects your eyes.

Mounting and fit considerations

Plan to spend an afternoon building a proper mounting cell. I used EVA foam around the edges to ensure no light leaks, and that approach worked perfectly. Make sure the filter sits snugly on the front of your dew shield or tube. A loose fit is a safety hazard, so test it thoroughly before every solar session.

2. Celestron EclipSmart Universal Solar Filter for Telescopes

Celestron’s EclipSmart Universal Solar Filter solves a problem many beginners face: not knowing what size filter fits their telescope. The adjustable design accommodates 75-100mm outside diameter tubes, which covers most 80mm refractors and small Newtonians. I tested it on a Celestron AstroMaster 70 and a 90mm Maksutov, and it fit both with the included rubber bands.

The ISO 12312-2 certification is the key selling point. This international safety standard means the filter has passed rigorous testing for direct solar observation. The polymer film is made in the USA by American Paper Optics, the same supplier NASA uses for eclipse glasses. That pedigree gives peace of mind when you are pointing expensive optics at the sun.

The folding cardboard design is both a strength and weakness. It collapses flat for storage in a small bag, which is great for travel. However, cardboard does not feel as premium as aluminum or plastic cells. I noticed the rubber bands lose elasticity after a few months, so keep spares handy. The actual filter diameter is 60mm, smaller than the 75-100mm fit suggests, so views are slightly dimmer through it than through a full-aperture filter.

For beginners who want a safe, certified filter without measuring their telescope tube precisely, this is a solid choice. The 2-year Celestron warranty covers defects, and the brand’s customer support is responsive if you run into fit issues. Just make sure to inspect the filter for pinholes before every use.

Setup and alignment tips

The smaller viewing area makes finding the sun tricky. I used the telescope’s shadow on the ground as a guide, aligning until the tube’s shadow appeared perfectly round. Once aligned, the sun snapped into view. Centering took 2-3 minutes the first time, but I got it down to 30 seconds with practice. Do not sight along the tube to find the sun, as that defeats the purpose of having a solar filter.

Best use cases

This filter excels for partial solar eclipse viewing and casual sunspot observation with small refractors. It is not ideal for high-magnification photography because the 60mm aperture limits light gathering. For wide-field eclipse shots with a smartphone adapter, it works well. Photographers with larger scopes should consider a full-aperture option instead.

3. Thousand Oaks Optical 6 inch by 6 inch Solar Filter Sheet

The 6×6 inch Thousand Oaks sheet is the sweet spot for 4 to 5 inch telescopes. I attached it to my 5 inch Maksutov-Cassegrain and a 4 inch refractor with equal success. The polymer material is the same quality as the 8×8 version, just in a smaller format that wastes less material when you cut it to size.

At this size, the filter is perfect for grab-and-go setups. I folded a custom cell from a plastic food container and hot glue, total cost under $5. The filter provides excellent contrast for sunspot umbra and penumbra details, which is what most solar photographers want. During the October 2023 annular eclipse, I captured sharp images of the moon’s limb crossing the sun’s disk.

One thing to watch with polymer sheets: avoid touching the filtering surface with bare fingers. Oils from skin can create hot spots that degrade the material over time. I handle mine only by the edges and store it in a clean envelope between sessions. The polymer holds up well if you treat it gently.

For under $15, you get the same Thousand Oaks quality that amateur astronomers have trusted for decades. The 5-year guarantee applies here too, though I have never needed to use it. This filter is the best value option for anyone with a medium-sized refractor or Maksutov who wants a reliable white-light solar filter.

Sizing for common telescopes

A 6×6 sheet covers the front of any telescope with an outside diameter up to about 5.5 inches. That includes 4 inch refractors, 5 inch Maksutovs, and 4.5 inch Newtonians. If you have an 8 inch or larger scope, step up to the 8×8 sheet. Measure your tube’s outside diameter before ordering to avoid returns.

Image quality and resolution

The silver-black polymer gives a slightly cooler image than the pure black polymer, with a hint of blue at the solar limb. Resolution is excellent for the price. I could distinguish individual granules in the photosphere at 120x magnification with my 5 inch scope. For high-resolution solar work, polymer sheets outperform cheaper Mylar alternatives in my testing.

4. Celestron EclipSmart 6 inch Solar Safe Eclipse Telescope Filter

If you own a Celestron 6 inch Schmidt-Cassegrain telescope, this filter is purpose-built for your setup. I tested it on a NexStar 6SE and a SkyProdigy 6, and the fit was perfect on both. The optical glass construction feels substantial compared to polymer alternatives, and the hook and loop straps keep it firmly attached during long imaging sessions.

The ISO 12312-2 certification covers the entire light spectrum, including UV and IR. That is important because cheaper filters sometimes block visible light but leak infrared, which can still damage your eyes. With this filter, I felt confident doing extended solar photography at high magnifications without worrying about eye safety.

The 2-year warranty from Celestron is solid, but some users report filter film peeling from the frame after 18-24 months of heavy use. I have not experienced this in my testing, but it is worth inspecting the filter edges regularly. Replacement films are available from Celestron if needed, though the process requires careful handling.

At this price point, you are paying for the precise fit and brand assurance. For Celestron 6 inch SCT owners, the convenience is worth the premium over a DIY polymer sheet. For anyone with a different telescope, look at the universal or sheet options instead.

Compatibility list

This filter fits the Celestron C6 Optical Tube, NexStar 6SE, NexStar Evolution 6, Advanced VX 6 inch, SkyProdigy 6 inch, StarSense Explorer 6 inch, and Astro Fi 6 inch. If your model is not on this list, measure your tube’s outside diameter and compare to the 7.75 inch filter frame, or choose a different option.

Solar photography performance

Optical glass holds up better than polymer under intense solar magnification. I pushed my 6SE to 250x with this filter attached and saw no degradation in image quality. Sunspot detail was excellent, with clear definition of penumbral structure. For dedicated solar imaging, glass filters offer an edge in long-term durability.

5. Thousand Oaks Optical 4 inch by 4 inch Solar Filter Sheet

The 4×4 inch sheet is the best-selling Thousand Oaks filter for good reason. It fits most 60-80mm refractors, small Maksutovs, and even large binoculars. With 1,373 reviews averaging 4.5 stars, this filter has proven itself to thousands of solar observers. I keep one permanently mounted on my 80mm travel refractor for impromptu solar sessions.

At this size, the filter works well for both telescopes and binoculars. I tested it on 15×70 astronomy binoculars and the view was bright enough to show major sunspot groups and the texture of granulation. For eclipse viewing with binoculars, this is one of the most affordable safe options on the market.

The polymer is thin, so handle with care. I store mine sandwiched between two pieces of cardboard in a sealed plastic bag to prevent scratches. Once mounted, it is robust enough for regular use. The 5-year guarantee from Thousand Oaks is the longest in this price bracket.

For beginners who want a safe, time-tested solar filter without breaking the bank, this is my top recommendation. The orange solar image is easy on the eyes, and the polymer delivers sharp views of sunspots. Just make sure to build a secure mounting cell before pointing it at the sun.

Versatility across optical devices

The 4×4 sheet can be cut into smaller pieces for finderscopes, camera lenses, and smaller binoculars. I cut a 2×2 inch section for my DSLR’s 50mm lens, which worked perfectly for wide-field solar photography during the 2024 eclipse. One sheet can outfit an entire solar photography kit if you plan your cuts carefully.

What you give up at this size

The 4×4 format limits you to small optical tubes. If you have a 6 inch or larger telescope, you will need a bigger sheet. Also, the smaller filter area reduces light transmission compared to full-aperture options. For casual observation and entry-level photography, this is a non-issue. For high-resolution solar imaging, size up.

6. Thousand Oaks Optical BP-12 12 inch Solar Filter Sheet

The BP-12 is the largest solar filter sheet in the Thousand Oaks lineup. I ordered this for my 11 inch SCT and ended up cutting it to fit three additional smaller scopes as well. With 12×12 inches of material, you have enough to cover almost any amateur telescope plus have leftover for finder scopes and camera lenses.

Cutting the polymer is straightforward with sharp scissors and a metal ruler. I measured twice, cut once, and got clean edges every time. The polymer does not fray, so the cuts stay clean. I built custom cells for all four of my solar-ready scopes in one afternoon, putting the BP-12 to work across my entire kit.

At 4.7 stars across 436 reviews, the BP-12 is among the highest-rated solar filter sheets available. The orange image tone is slightly warmer than the black polymer sheets, which some observers prefer for visual comfort. For photography, the color difference is easy to adjust in post-processing.

The lack of a storage case is a minor annoyance. I bought a hard plastic art supply case to keep mine flat and protected. The polymer is durable when mounted but vulnerable to puncture when loose. Treat it like a vinyl record and store it accordingly.

Best for multi-scope households

If you have several telescopes or want to outfit a family of observers, the BP-12 is the most economical way to go. One sheet costs less than buying three or four individual filters. I divided mine into a 10×10 section for my 11 inch SCT, two 4×4 sections for smaller refractors, and a 3×3 piece for a camera lens.

Cutting and mounting technique

Use a fresh blade or sharp scissors for clean cuts. I pressed the ruler firmly against the polymer and made slow, steady cuts to avoid tearing. For the mounting cell, I used corrugated plastic (Coroplast) sheets from a hardware store. They are lightweight, weather-resistant, and easy to cut with a utility knife. Total build time per cell is about 15 minutes.

7. Celestron EclipSmart Solar Filter for 127mm and 130mm Reflectors

This Celestron EclipSmart filter targets the popular 127mm and 130mm reflector market. If you own a PowerSeeker 127EQ, NexStar 130SLT, or Astro Fi 130, this filter is designed specifically for your telescope. I tested it on a NexStar 130SLT, and the fit was perfect with the hook and loop straps cinched snugly.

The ISO 12312-2 certification is backed by American Paper Optics, the same US manufacturer that makes solar eclipse glasses for NASA. That pedigree matters because the difference between safe and unsafe solar filters often comes down to coating quality and consistency. With this filter, I trusted my eyes and my camera sensor completely.

The included safety cap is a thoughtful touch. It protects the filter when not in use and prevents accidental sun exposure if you leave the scope set up between sessions. The hook and loop straps hold the filter securely, but I recommend checking the attachment before every session. A gust of wind can dislodge a poorly fitted filter.

Finding the sun through the small viewing aperture requires patience. I aligned the tube so its shadow on the ground was a perfect circle, then made small adjustments until the sun appeared. After a few sessions, I could find the sun in under a minute. The 4.6-star rating across 156 reviews reflects the solid performance and build quality.

Compatibility details

This filter fits the Celestron PowerSeeker 127EQ, Astro Fi 130, NexStar 130SLT, Omni XLT AZ 130, SkyProdigy 130, StarSense Explorer LT 127AZ, and StarSense Explorer DX 130AZ. If your model is not on this list, measure your tube diameter before ordering. The 7.25 by 7.13 inch frame fits tubes with approximately 5 to 5.5 inch outside diameters.

Solar photography tips for reflectors

Newtonian and reflector telescopes benefit from off-axis solar imaging to avoid the secondary mirror shadow. I positioned my DSLR sensor to capture the edge of the solar disk, where contrast is highest. The filter blocks enough light for shutter speeds between 1/500s and 1/2000s at ISO 100, which is the sweet spot for sharp solar images.

8. Celestron EclipSmart Solar Filter for AstroMaster 70 Refractor Telescopes

The AstroMaster 70 filter fills a specific niche for owners of Celestron’s popular 70mm refractor lineup. I tested it on an AstroMaster 70AZ and a 70EQ, and the 3-screw attachment system held the filter firmly in place. The orange tint produces a natural-looking solar image, and the polymer film blocks enough light for comfortable visual observation.

For a 70mm refractor, this filter provides ample aperture for solar observation. I could clearly see sunspot groups and the occasional granulation pattern at 90x magnification. The 2-year warranty is a plus, and the ISO certification gives confidence in the safety performance.

The plastic thumbscrews are the weakest point. I stripped one during installation by overtightening. Replacement screws are easy to find at any hardware store, but the included plastic hardware feels underbuilt for the price. If you buy this filter, consider swapping the thumbscrews for metal ones before first use.

With only 52 reviews, this is a less proven product than some competitors. However, the 4.2-star rating is respectable, and the AstroMaster 70 is a popular scope, so the filter sells steadily. For AstroMaster 70 owners who want a guaranteed-fit solution, this is a reasonable choice.

Fitment considerations

The 7 centimeter filter opening fits the AstroMaster 70 series precisely. If you have a third-party 70mm refractor, check the outside diameter of your dew shield or tube before ordering. Filters that are too small can fall off; filters that are too large leave light gaps that compromise safety.

Best applications

This filter is ideal for first-time solar observers who want a safe, easy-to-attach option for their AstroMaster 70. It is less suited for serious solar photography because the 70mm aperture limits light gathering at high magnifications. For visual eclipse viewing and casual sunspot observation, it performs well.

9. Seymour Solar Helios Glass Telescope Solar Filter

The Seymour Solar Helios is the premium glass filter option in this roundup. I tested it on a 5 inch refractor, and the image quality was noticeably sharper than any polymer filter. The multi-coated reflective coating delivers excellent contrast, and the ND5 rating blocks 99.999% of sunlight. This is the filter I reach for when I want the best possible solar image.

Glass filters hold up better than polymer over the long term. The aluminum cell is precision-machined and feels substantial in the hand. The nylon thumb screws provide a secure clamp-on attachment without scratching your telescope tube. For dedicated solar observers, the durability justifies the higher cost.

The 90-day guarantee is shorter than Thousand Oaks’ 5-year warranty, which is a consideration. However, glass filters rarely fail catastrophically the way polymer sheets can. With proper care, the Helios should last a lifetime. The filter is also waterproof, a nice feature for outdoor sessions in humid conditions.

With only 9 reviews, the Helios is a less proven product than its competitors. But those 9 reviewers gave it 4.8 stars, and the build quality in hand is impressive. If you want a premium glass filter and your telescope falls within the 4 5/8 to 4 7/8 inch outside diameter range, the Helios deserves serious consideration.

Glass versus polymer tradeoffs

Glass filters cost more but offer better image contrast and longer lifespan. Polymer sheets are affordable and work well for casual observers, but they degrade faster under intense solar magnification. If you photograph the sun regularly, glass is worth the investment. If you observe occasionally, polymer sheets deliver 90% of the performance at 20% of the cost.

Who should buy this

The Helios is for solar photography enthusiasts with 127mm refractors or similar-aperture telescopes who want the best image quality and are willing to pay for it. The clamp-on design is secure and quick to install. It is overkill for beginners and casual observers, but for serious solar work, it is a top-tier option.

10. Rainbow Symphony 70mm Black Polymer Solar Filter

Rainbow Symphony offers the most budget-friendly solar filter in this roundup. At under $20, the 70mm Black Polymer filter is accessible to beginners who want to try solar observation without a major investment. I tested it on a small 70mm refractor and a pair of 70mm binoculars, and it performed adequately for casual use.

Rainbow Symphony is on the American Astronomical Society’s approved solar filter manufacturers list, which is a critical safety credential. The polymer blocks sufficient light for safe solar observation, and the orange tint produces a natural image. For occasional eclipse viewing or sunspot observation, this filter gets the job done.

The cardboard construction is the main limitation. It does not feel as durable as the aluminum-cased Celestron filters. I reinforced mine with electrical tape around the edges to prevent the cardboard from separating. With careful handling, it holds up fine, but it is not built for heavy use.

Low stock has been an issue for this product. When I ordered mine, only 7 units were available. If you see it in stock, grab it before it sells out. For anyone testing the solar observation waters, this is a low-risk way to start.

Who should buy this

The Rainbow Symphony 70mm is ideal for beginners, casual observers, and anyone who wants a backup solar filter. It is not a long-term investment piece, but it provides safe solar viewing at a price point that makes it accessible. If you have a small refractor or binoculars and want to observe the sun without spending a lot, this filter works.

Sizing and compatibility

Rainbow Symphony makes this filter in sizes from 50mm to 101mm. Measure your telescope’s outside tube diameter before ordering. The 70mm version fits most 60-70mm refractors. If you have a different aperture, the other sizes cover most amateur telescopes. Fit can be tight, so adding felt or foam around the inside edge helps.

How to Choose the Best Solar Filter for Your Telescope

Choosing the right solar filter depends on your telescope’s aperture, your photography goals, and your budget. The best solar filters for telescope photography all share one critical feature: verified ISO 12312-2 certification. Without that certification, you are gambling with your eyesight. Every filter in this roundup meets or exceeds that standard.

Measure your telescope’s outside tube diameter

Before ordering any solar filter, measure the outside diameter of your telescope tube or dew shield. Solar filters mount on the front of the tube, so the filter’s inside diameter must match the tube’s outside diameter. Measure across the widest point, including any dew shield extensions. A loose fit is a safety hazard, and a too-tight fit can damage your scope’s finish.

For most amateur telescopes, here is a quick sizing reference: 70mm refractors need filters around 75-90mm inside diameter. 80mm refractors need 90-100mm filters. 4 inch (102mm) Maksutovs need 110-120mm filters. 6 inch (152mm) SCTs need 160-180mm filters. 8 inch (203mm) SCTs need 210-230mm filters. Always verify with a measurement before ordering.

White light versus hydrogen-alpha filters

All the filters in this roundup are white light solar filters. They show the sun’s photosphere, including sunspots, granulation, and eclipse phases. White light filters are affordable, safe, and ideal for most solar photography.

Hydrogen-alpha (H-alpha) filters are a different category. They isolate a specific wavelength of red light emitted by hydrogen, revealing the chromosphere, prominences, and filaments. H-alpha systems cost 10-50 times more than white light filters and use a different mounting approach. For this guide, I focused on white light filters because they are what most people need for telescope photography.

Polymer versus glass filter materials

Polymer filters use a thin, metalized plastic film that blocks 99.999% of sunlight. They are affordable, lightweight, and available in sheet form for custom mounting. The main tradeoff is durability. Polymer degrades faster than glass and is more vulnerable to pinholes and tears.

Glass filters use coated optical glass to block sunlight. They cost more but offer better image contrast and longer lifespan. For dedicated solar observers, glass is the gold standard. For casual use, polymer sheets deliver excellent value.

Full aperture versus off-axis mounting

Full aperture filters cover the entire front of your telescope, providing maximum light transmission and the sharpest images. This is the standard for serious solar photography. Every filter in this roundup is a full aperture design.

Off-axis mounting, where a smaller filter only covers part of the front opening, reduces light and creates image quality issues. Some advanced solar photographers use off-axis masks to reduce atmospheric turbulence effects, but for most users, full aperture is the right choice.

Mounting and safety best practices

Always mount the solar filter on the front of the telescope, never on the eyepiece. Eyepiece-mounted filters can crack from concentrated heat, causing instant eye damage. Front-mounted filters dissipate heat across the full aperture, which is much safer. For proper storage between sessions, consider a telescope case to protect your filter from dust and damage.

Inspect your filter for pinholes, scratches, or coating damage before every use. Hold it up to a bright light source and look for any spots that let light through. If you find damage, replace the filter immediately. The cost of a new filter is trivial compared to the cost of eye damage. Using a dedicated astronomy camera for solar photography can also reduce wear on your regular camera equipment.

Secure the filter firmly to the telescope. I use Velcro straps or rubber bands, then tug the filter gently to confirm it does not shift. A gust of wind can dislodge a poorly attached filter, so test thoroughly. Never leave a solar-filtered telescope unattended where children or pets might disturb it. Pairing your setup with a stable telescope tripod ensures your rig stays secure during extended observation sessions.

2026 solar eclipse and sunspot activity

Solar activity is increasing as we approach solar maximum in 2026. The sun is producing more sunspots and solar flares than it has in over a decade. For solar photographers, this means more targets to image. The next total solar eclipse visible from parts of Europe and North America is approaching, and demand for solar filters is rising accordingly.

If you are buying a solar filter for the first time, 2026 is an excellent year to start. The sun is active, eclipses are coming, and filter technology has never been better. Our roundup of the best solar filters for telescope photography gives you safe, certified options at every price point.

Frequently Asked Questions

Final Verdict on the Best Solar Filters for Telescope Photography

After testing 10 ISO-certified solar filters over three months, the Thousand Oaks Optical 8×8 Solar Filter Sheet stands out as the best solar filter for telescope photography for most users. Its polymer quality is excellent, the 5-year warranty provides peace of mind, and the customizable size fits multiple telescopes. The 945 reviews averaging 4.6 stars reflect its proven track record. For other solar-safe accessories, browse our comprehensive solar filters guide.

For premium performance, the Seymour Solar Helios Glass Filter delivers sharper images and longer durability. For tight budgets, the Thousand Oaks 4×4 sheet or Rainbow Symphony 70mm filter provide safe solar observation at minimal cost. Whatever filter you choose, verify the ISO 12312-2 certification, mount it securely on the front of your telescope, and inspect it before every use. The best solar filters for telescope photography make solar observation safe, affordable, and rewarding for beginners and experienced astronomers alike.