10 Best Solar Observation Filters for Safe Viewing in 2026

Choosing the right solar observation filter is essential for protecting your eyes, camera sensor, and telescope optics when viewing the Sun. The best option depends on your instrument’s aperture, front-opening dimensions, and whether you need a fitted filter or cut-to-size sheet.

This roundup compares 10 solar filters, including telescope-specific Celestron EclipSmart models, flexible filter sheets, and camera lens filters. Use the guide below to match the filter type, size, and safety features to your equipment.

Best 10 Solar Observation Filters Picks for 2026

Best DIY Solar Filter Sheet – 8-Inch Polymer Sheet

This 8-by-8-inch Thousand Oaks Optical polymer sheet is a flexible option for building solar observation filters for telescopes, binoculars, or cameras. It is designed for viewing sunspots and granulation and produces a natural orange-colored Sun image.

Best For: DIY solar observation filters for larger telescopes, binoculars, and cameras.

Pros:

• Works with telescopes, binoculars, and cameras.
• Black polymer is designed for observing sunspots and granulation.
• Can cost less than a factory-made filter and is backed by a stated five-year guarantee.
• Produces a natural orange solar image.

Cons:

• Requires the buyer to construct a suitable filter.
• Must be securely attached with sticky tape to prevent it from falling during observation.
• The sheet is not water resistant.

This is a practical material choice when you want to customize a filter for different equipment. Safe construction and secure attachment are essential before using it for solar viewing.

Best Camera Solar Filter – 95mm ND1000000 Filter

This K&F CONCEPT ND1000000 camera filter provides 20 stops of neutral-density reduction for cameras with a 95mm filter thread. For photographers comparing solar observation filters, its optical-glass construction and multi-coating are geared toward camera-based imaging rather than telescope viewing.

Best For: Camera owners with a compatible 95mm lens thread who want a fixed 20-stop neutral-density filter.

Pros:

• Provides 20 stops of neutral-density filtering.
• Uses optical glass with 28-layer multi-coating.
• Waterproof and scratch-resistant design.
• Fits cameras with a 95mm filter thread, including the listed compatible lenses.

Cons:

• Only compatible with cameras and lenses using a 95mm filter thread.
• It is a fixed neutral-density filter, limiting adjustment flexibility.
• The supplied notes do not identify it as an ISO-compliant direct-viewing solar filter.

This filter may suit specialized solar photography setups when the thread size and intended use match. Confirm compatibility and the appropriate safe solar-imaging method before use.

Best Secure Telescope Solar Filter – Celestron 8-Inch EclipSmart

The Celestron EclipSmart is a ready-made 8-inch solar filter for compatible Celestron Schmidt-Cassegrain and EdgeHD telescopes. Among solar observation filters, it stands out for its stated ISO 12312-2:2015(E) compliance, orange-tinted views, and two hook-and-loop straps for a snug fit.

Best For: Owners of compatible Celestron 8-inch Schmidt-Cassegrain or EdgeHD telescopes observing eclipses, sunspots, or the Sun.

Pros:

• Designed to conform to ISO 12312-2:2015(E).
• Compatible with Celestron 8-inch Schmidt-Cassegrain and EdgeHD telescopes.
• Two hook-and-loop straps help secure it to the telescope objective.
• Includes a two-year US warranty and unlimited support from US-based experts.

Cons:

• Compatibility is limited to the listed Celestron 8-inch telescope types.
• The supplied notes do not indicate broad compatibility with binoculars or cameras.
• It has an orange tint, which may not suit users seeking a neutral-color view.

This is the most straightforward choice for owners of the specified Celestron telescopes who want a fitted, supported solution. Verify the telescope model and inspect the attachment before every solar session.

Best Compact DIY Solar Filter – 6-Inch Polymer Sheet

This 6-by-6-inch Thousand Oaks Optical silver-black polymer sheet lets you make a custom solar observation filter for a telescope, binoculars, or camera. It is intended for viewing sunspots and granulation and gives the Sun a natural orange appearance through a telescope.

Best For: DIY filters for smaller telescopes, binoculars, and cameras that can be covered by a 6-by-6-inch sheet.

Pros:

• Compatible with telescopes, binoculars, and cameras.
• Compact 6-by-6-inch size is convenient for smaller custom builds.
• Designed for observing sunspots and granulation.
• Produces a natural orange solar image.

Cons:

• Requires custom construction rather than offering a ready-made mount.
• Must be secured with sticky tape so it cannot fall during observation.
• The polymer is not water resistant.

This sheet is a budget-conscious way to create a tailored filter when a smaller format is sufficient. Measure the equipment first, then build and attach the filter carefully before pointing it at the Sun.

Best Fit for 127–130mm Reflectors – EclipSmart 127/130mm Solar Filter

For owners of compatible 127mm or 130mm reflectors, this Celestron EclipSmart is a purpose-built option among solar observation filters. It is designed for direct solar viewing, including eclipses and sunspots, with a secure attachment system and an orange-tinted image.

Best For: Celestron 127mm and 130mm reflector owners who want a ready-to-use solar filter.

Pros:

• Conforms to the ISO 12312-2:2015(E) safety standard for direct solar viewing.
• Compatible with several listed Celestron 127mm and 130mm telescopes.
• Two hook-and-loop straps and a protective safety cap support secure, practical use.
• Includes a 2-year US warranty and US-based support.

Cons:

• Compatibility is limited to the listed telescope models and sizes.
• Its orange solar image may not suit users seeking a different viewing appearance.

This is a straightforward choice when your telescope appears on the compatibility list. Its fitted design is more convenient than making a filter from sheet material, while the included cap helps protect it between observing sessions.

Most Flexible DIY Option – BP-12 Solar Filter Sheet

The Thousand Oaks Optical BP-12 is a 12-by-12-inch sheet for shoppers who want adaptable solar observation filters. It can be cut and mounted for a telescope, binoculars, finder, camera, or pocket eclipse viewer, making it useful for custom projects rather than a specific telescope model.

Best For: DIY users who need one sheet for building filters for multiple compatible devices.

Pros:

• Large 12-by-12-inch sheet offers material for custom filter designs.
• Compatible with telescopes, finders, binoculars, cameras, and pocket eclipse viewers.
• Black polymer produces an orange solar image and is described for observing sunspots and granulation.

Cons:

• Requires the buyer to construct and securely mount the filter.
• Ships in cardboard and does not include a storage case.
• The supplied notes emphasize covering any unprotected sight block before viewing.

This sheet is the practical pick when versatility matters more than plug-and-play installation. It can support several custom applications, but careful construction and safe coverage of every viewing path are essential.

Best for 6-inch SCTs – EclipSmart 6-inch Solar Filter

Owners of compatible 6-inch Schmidt-Cassegrain telescopes can use this Celestron EclipSmart as a dedicated option among solar observation filters. It is intended for direct solar viewing of eclipses and sunspots, with a snug strap attachment and an orange-tinted image for visual observing or imaging.

Best For: Celestron 6-inch Schmidt-Cassegrain telescope owners seeking a model-specific solar filter.

Pros:

• Conforms to the ISO 12312-2:2015(E) safety standard for direct solar viewing.
• Compatible with listed Celestron 6-inch Schmidt-Cassegrain models, including the C6 Optical Tube and NexStar 6SE.
• Two hook-and-loop straps help hold the filter securely on the telescope objective.
• Uses Celestron Solar Safe film made in the USA and independently tested by a third-party lab.

Cons:

• Designed for compatible 6-inch Schmidt-Cassegrain telescopes rather than general-purpose use.
• Does not include a stated protective cap in the supplied notes.

If you use one of the listed 6-inch Celestron systems, this filter avoids the sizing uncertainty of a universal sheet. Confirm your telescope model before ordering, then use the strap system to keep the filter fitted during observation.

DIY Solar Filter Material – 4-Inch Solar Filter Sheet

If you need adaptable solar observation filters for a telescope, binoculars, or camera, this 4-by-4-inch Thousand Oaks Optical black polymer sheet is designed for a custom fit. It produces a natural orange solar image and can cost less than a factory-made filter, but you must build and attach the holder securely.

Best For: DIY users who want to make a custom solar filter for compatible optical equipment.

Pros:

• Works with telescopes, binoculars, and cameras.
• Black polymer is intended for viewing sunspots and granulation.
• Stronger than Mylar, with filtering properties protected within the substrate.
• Backed by a manufacturer with over 30 years of solar-filter experience and a stated five-year guarantee.

Cons:

• Requires you to construct a suitable filter mount.
• The filter must be firmly secured with tape so it cannot fall during observation.
• The 4-by-4-inch sheet may not cover every setup without cutting or custom fitting.

This is a practical, economical option for careful hobbyists comfortable with DIY construction. Safety depends on making a secure, correctly fitted holder before observing.

Solar Photography Filter – Urth 82mm ND100000 Plus

For photographers comparing solar observation filters for an 82mm lens, the Urth ND100000 Plus is built for extreme light reduction and celestial-event photography. Its 16.6-stop rating and 20-layer CoraNano coating support controlled exposures, contrast, and color in very bright conditions.

Best For: Camera users with 82mm filter threads who want strong exposure control for direct-sun and celestial-event photography.

Pros:

• Reduces light by 99.9999% for extreme long exposures.
• Uses German SCHOTT B270 optical glass with a 20-layer CoraNano coating.
• Ultra-slim rim is designed to avoid vignetting.
• 6061 aluminum construction is backed by a lifetime guarantee.

Cons:

• Limited to lenses or equipment using an 82mm filter size.
• Its extreme density is intended for specialized bright-light photography rather than general-purpose filtering.
• The supplied details list a maximum shutter speed of 30 seconds.

This is the most photography-focused choice in the group, combining very dense filtration with coated optical glass. Confirm your lens thread size and camera workflow before buying.

Universal Solar Safety Filter – Celestron EclipSmart Universal Filter

Among solar observation filters, the Celestron EclipSmart is a convenient choice when you want a ready-to-use fit for an objective diameter of 75mm to 100mm. Its adjustable panels and elastic band are designed for secure installation on compatible telescopes, spotting scopes, or DSLR cameras.

Best For: Owners of compatible 75mm-to-100mm optical equipment who want a folding, reusable filter for eclipses and everyday solar viewing.

Pros:

• Conforms to the ISO 12312-2:2015(E) safety standard for direct solar viewing.
• Adjustable side panels and an elastic band help secure it to compatible equipment.
• Works with telescopes, spotting scopes, and DSLR cameras.
• Folds flat for storage and includes a reusable bag, plus a two-year US warranty.

Cons:

• Compatible only with objective lenses measuring 75mm to 100mm outside diameter.
• It may not fit equipment outside the listed compatibility range.
• Like any front-mounted filter, it should be checked for a secure fit before use.

The EclipSmart is a strong convenience pick for users who prefer an adjustable, reusable product over constructing a filter themselves. Verify the outside diameter of your equipment before ordering.

How We Picked These Solar Observation Filters

We selected products across the main categories buyers typically consider: fitted telescope filters, universal models, cut-to-size solar filter sheets, and camera lens filters. We focused on products that state their intended solar-viewing use, offer an appropriate fit range or clearly listed dimensions, and provide useful information about optical density, coating, or compliance.

Fit and intended use matter more than brand alone. A filter must mount securely over the front of the telescope, binocular objective, or camera lens; eyepiece-mounted solar filters should not be used. Always follow the manufacturer’s instructions and inspect the filter for scratches, pinholes, creases, or other damage before use.

Quick Comparison

Filter type	Best for	Main advantage	Watch for
Fitted telescope filter	Specific telescope models	Secure, straightforward installation	Correct aperture and outer diameter
Universal telescope filter	Multiple compatible instruments	Flexible sizing	Clamps or fasteners must be secure
Solar filter sheet	Custom openings and larger equipment	Can be cut to size	Requires careful construction and mounting
Camera lens filter	Still photography and telephoto lenses	Threaded lens attachment	Exact thread size and camera-specific safety guidance

Key Buying Factors for Solar Observation Filters

Correct Size and Attachment

Measure the outside diameter of the telescope’s front rim, not just the stated aperture. For threaded camera filters, match the lens filter thread exactly. A filter that is loose, forced into place, or attached behind the optics is not a safe substitute for a properly fitted front-mounted filter.

Optical Density and Stated Solar Use

Look for products explicitly designed for direct solar observation or solar photography. ND ratings such as ND100000 or a stated stop reduction can help describe light attenuation, but a generic neutral-density filter is not automatically safe for viewing the Sun. Prioritize documented solar use and the manufacturer’s instructions.

Material and Condition

Sheet filters are useful when you need a custom size, but they must be mounted without wrinkles, gaps, or accidental light paths. Check glass or film filters before every session. Do not use any filter with visible damage, and do not rely on sunglasses, stacked photographic filters, or improvised materials.

Viewing Versus Photography

Some filters are designed primarily for visual observation, while others are intended for cameras. Photography may require additional control over exposure, focus, and sensor protection. Confirm compatibility with your camera and lens, particularly when using long telephoto equipment.

Who Should Buy Which Solar Observation Filters?

Choose a fitted Celestron EclipSmart filter if you own a compatible telescope and want a purpose-built installation with minimal measuring or cutting. Verify the listed telescope aperture and front dimensions before ordering.

Choose a universal filter if you use more than one telescope or need adjustable compatibility. Pay close attention to the attachment system and secure the filter before pointing the instrument at the Sun.

Choose a solar filter sheet if your telescope, binoculars, or camera has an unusual size or you need to create a custom front-mounted solution. Use the sheet only with a carefully constructed holder that cannot slip off.

Choose a dedicated solar camera filter when photographing through a compatible lens. Match the thread diameter precisely and follow the filter maker’s guidance for solar imaging. Regardless of the format, never look through an unfiltered optical system pointed at the Sun.