10 Best Solar Observation Filters Under $100 for Safe Viewing in 2026

Observing the Sun requires the right optical protection—not improvised materials or ordinary sunglasses. The best solar observation filters under $100 help you view or photograph solar activity while matching your telescope, camera lens, or binoculars.

This roundup focuses on affordable options spanning threaded camera filters, filter sheets, adjustable caps, and purpose-built telescope filters. Check fit, certification, optical format, and secure attachment before making a purchase.

Best 10 Solar Observation Filters Under 100 Picks for 2026

Best for 8-inch Celestron Scopes – EclipSmart 8-inch Solar Filter

For shoppers comparing solar observation filters under 100, the Celestron EclipSmart is a telescope-specific option for compatible 8-inch Celestron Schmidt-Cassegrain and EdgeHD models. It uses USA-made solar film, meets ISO 12312-2:2015(E), and provides an orange-tinted view for eclipses and sunspots.

Best For: Owners of compatible Celestron 8-inch Schmidt-Cassegrain or EdgeHD telescopes who want a securely attached filter for viewing or imaging the Sun.

Pros:

• Conforms to the ISO 12312-2:2015(E) safety standard.
• Designed specifically for compatible 8-inch Celestron telescopes.
• Two hook-and-loop straps help secure the filter to the objective.
• Includes a two-year US warranty and US-based support.

Cons:

• Compatibility is limited to the specified 8-inch telescope designs.
• The orange tint may not suit shoppers seeking a neutral-looking solar image.

This is a focused choice rather than a universal filter. If you already own a compatible Celestron telescope, its stated safety compliance, snug fit, and included support make it a practical upgrade for solar observing.

Best for 37mm Camera Threads – Threaded Camera Solar Filter

Among solar observation filters under 100, this Spectrum Telescope model is built for camera setups with a 37mm thread. Its full-aperture polymer design creates a natural yellowish-orange solar image and is supplied in protective packaging that doubles as storage.

Best For: Photographers or telescope users with a 37mm threaded camera connection who want to view or photograph the Sun through a full-aperture filter.

Pros:

• Made from durable 0.002-inch black plastic polymer.
• 37mm threaded design fits the specified camera filter size.
• Full-aperture construction helps limit incoming light and atmospheric turbulence.
• Foam-lined and plastic storage packaging helps protect the filter.

Cons:

• Only suited to equipment using a 37mm thread.
• Warranty coverage is limited to 30 days.

The threaded format makes this a straightforward fit-specific purchase. Confirm your camera or optical setup uses a 37mm connection before choosing it, especially if you need broader compatibility.

Best Adjustable Telescope Cap – Astromania 75mm Aperture Filter

For buyers researching solar observation filters under 100, the Astromania Deluxe Filter uses an adjustable metal cap for telescope tubes measuring 70mm to 92mm across. Its 75mm aperture, aluminum cell, and ISO 12312-2:2015 compliance make it a versatile fit-focused option.

Best For: Telescope owners with an outer tube diameter between 70mm and 92mm who want an adjustable, screw-secured solar filter.

Pros:

• Designed for telescope tubes with 70mm–92mm outer diameters.
• Meets ISO 12312-2:2015, with security verification noted in the supplied details.
• Three capped clamping screws help create a secure, telescope-friendly fit.
• Baader Astro film is mounted in a sturdy anodized aluminum cell.

Cons:

• It is not water resistant.
• The manufacturer notes that larger filters may show wavy lines in the film.
• The filter must not be used if the film is damaged or otherwise defective.

This model stands out when tube diameter varies within its supported range. Measure the telescope before buying, and inspect the film carefully before every use as directed by the manufacturer.

Best for 46mm Camera Lenses – Hyperion Threaded Solar Filter

This Seymour Solar Hyperion model is a practical pick among solar observation filters under 100 for camera lenses with a 46mm front thread. The threaded solar film filter is intended for photographing the Sun and is independently tested to block 99.999% of the Sun’s rays when installed and used correctly.

Best For: Photographers with a 46mm threaded camera lens who want to document eclipses, sunspots, and other solar features.

Pros:

• 46mm threaded design attaches to the front of a compatible camera lens.
• Solar film is independently tested to block 99.999% of the Sun’s rays.
• Made in the USA by a manufacturer with solar-filter experience since 2007.
• Includes a foam case and a 90-day guarantee under the stated conditions.

Cons:

• Compatibility is limited to lenses with a 46mm thread.
• The guarantee has specific sealed-bag return conditions and may require return shipping from the customer.

This is a specialized lens filter for image-making rather than a general telescope accessory. Verify the 46mm thread size and follow the installation instructions carefully before pointing the camera at the Sun.

Best DIY Solar Filter Sheet – 8-Inch Polymer Filter

For shoppers comparing solar observation filters under 100, this 8-by-8-inch Thousand Oaks Optical sheet is a flexible, budget-conscious option for building a custom filter. Its black polymer material is designed for observing sunspots and granulation through telescopes, binoculars, and cameras, with the Sun appearing orange.

Best For: DIY filters for larger telescopes, binoculars, or cameras.

Pros:

• 8-by-8-inch sheet can be adapted to multiple devices.
• Black polymer is intended for observing sunspots and granulation.
• Produces a natural orange-colored solar view.
• Thousand Oaks Optical states the material is stronger than Mylar, with filtering properties protected within the substrate.

Cons:

• Requires you to make and attach the filter yourself.
• Must be secured carefully with sticky tape to prevent it from falling during observation.
• Not water resistant.

This is a practical choice when you want broad sizing flexibility and lower-cost DIY construction rather than a ready-made telescope fit. Careful attachment is essential before use.

Best Ready-Made Solar Filter – Celestron EclipSmart 127/130mm

Among solar observation filters under 100, the Celestron EclipSmart is a convenient ready-made option for selected 127mm and 130mm reflectors. It is designed for direct solar viewing, conforms to ISO 12312-2:2015(E), and uses two hook-and-loop straps for a snug attachment.

Best For: Owners of compatible Celestron 127mm or 130mm reflector telescopes who want a fitted solar filter.

Pros:

• Compatible with several listed Celestron 127mm and 130mm reflector models.
• Two hook-and-loop straps help secure the filter to the telescope objective.
• Includes a safety cap to protect the filter surface when stored.
• Orange-tinted film provides a natural-looking view and is suitable for visual observing and imaging.

Cons:

• Compatibility is limited to the listed telescope models and sizes.
• Less flexible than a sheet filter for custom equipment.
• Its fit should be checked carefully on the specific telescope before observing.

This is the most convenient pick of the three for users with a matching Celestron reflector. The secure strap system and included cap reduce setup and storage hassle compared with making a filter from scratch.

Best Compact DIY Solar Filter – 6-Inch Polymer Sheet

This 6-by-6-inch Thousand Oaks Optical sheet is a compact option for shoppers seeking solar observation filters under 100. The silver-black polymer can be cut or fitted for telescopes, binoculars, and cameras, and it produces an orange-colored solar image when used through a telescope.

Best For: Smaller DIY solar-filter projects and compact observing equipment.

Pros:

• 6-by-6-inch format is convenient for smaller custom filter builds.
• Works with telescopes, binoculars, and cameras when properly fitted.
• Designed for observing sunspots and granulation.
• Costs less than many factory-made filter solutions according to the supplied product notes.

Cons:

• Requires custom construction and attachment.
• Smaller dimensions may not suit larger telescope objectives.
• Must be secured with sticky tape so it cannot fall during observation.

Choose this sheet when a compact size matches your equipment and you prefer the flexibility of a DIY filter. Measure the objective first, then make sure the finished filter is firmly attached before viewing.

Compact Camera Filter – 101mm Black Polymer

For shoppers comparing solar observation filters under 100, this 101mm black polymer filter is a compact option designed for compatible cameras. Its multi-coated construction and 10.1-centimeter filter size make fit verification especially important before purchase.

Best For: Camera users who need a compact 101mm solar filter.

Pros:

• Black polymer construction.
• Multi-coated filter surface.
• Compact 3.98-by-3.98-inch dimensions.

Cons:

• Compatibility is listed for cameras, so it may not suit telescope or binocular setups.
• Not water resistant.
• Only one filter is included.

This is a straightforward, compact choice when your camera accepts its 10.1-centimeter size. Confirm the mounting dimensions and intended use before observing.

DIY Sheet Pick – BP-12 12-by-12-Inch Solar Filter Sheet

Among solar observation filters under 100, the Thousand Oaks BP-12 stands out as a large sheet for creating a custom filter. The 12-by-12-inch black polymer sheet can be adapted for telescopes, binoculars, cameras, finders, or a pocket Eclipse Viewer.

Best For: DIY projects and users needing material for multiple custom applications.

Pros:

• Generous 12-by-12-inch sheet size.
• Compatible with telescopes, binoculars, cameras, finders, and pocket Eclipse Viewers.
• Produces an orange solar image.
• Made in the USA.

Cons:

• Requires the buyer to make a suitable filter.
• Ships in cardboard without a storage case.
• Not water resistant.

The BP-12 offers flexibility rather than a ready-made mount. It is a practical option for experienced users who can create a secure, properly fitted filter for their equipment.

Universal Fit Choice – Celestron EclipSmart Universal Solar Filter

For shoppers seeking solar observation filters under 100, the Celestron EclipSmart is a ready-to-use universal filter for objective lenses measuring 75 to 100mm outside diameter. Adjustable side panels, an elastic band, and a reusable storage bag make it convenient for telescope, spotting-scope, and DSLR-camera use.

Best For: Users who want an adjustable, ready-made filter for 75–100mm equipment.

Pros:

• Conforms to the ISO 12312-2:2015(E) standard according to the supplied notes.
• Fits objective lenses from 75 to 100mm.
• Includes adjustable panels, an elastic band, and a reusable bag.
• Backed by a two-year limited warranty.

Cons:

• Limited to equipment with a 75–100mm outside diameter.
• Not water resistant.
• Orange tint may not suit users seeking a different color rendition.

This is the most convenient of the three for users who want a secure, adjustable fit without cutting filter material. Measure the equipment’s outside diameter before ordering.

How We Picked the Best Solar Observation Filters Under 100

We selected products that cover the most common solar-observation setups while staying below the $100 price target. The list includes dedicated telescope filters, threaded camera-lens filters, and solar film sheets that can work with compatible optical equipment. We also considered stated safety standards, material type, aperture coverage, mounting method, and the likelihood of achieving a secure fit.

Compatibility is especially important: a filter must be designed for the front of the optical system or used exactly as directed by its manufacturer. Always inspect solar film and filter surfaces for pinholes, tears, cracks, or loose fittings before use.

Quick Comparison

Filter type	Best suited to	Main advantage	Check before buying
Threaded camera filter	Camera lenses	Direct lens compatibility	Thread diameter and lens hood clearance
Filter sheet	DIY holders, telescopes, binoculars, cameras	Flexible sizing	Safe front-mounted construction
Adjustable metal cap	Compatible telescope tubes	Rigid, reusable fit	Outer tube diameter and aperture
Dedicated telescope filter	Specified telescope models or apertures	Simple setup	Tube size, model compatibility, and retention

Key Buying Factors for Solar Observation Filters Under 100

Fit and Attachment

Measure the outside diameter of your telescope tube or the filter thread on your camera lens. A filter should attach firmly and remain secure when the equipment is moved. For sheet material, use a proper front-mounted holder rather than placing the sheet loosely over an eyepiece.

Safety Labeling and Material

Look for clearly stated solar-observation specifications, such as ISO compliance where applicable, and follow the manufacturer’s instructions. Do not assume that a dark-looking material is safe. Never use an unverified photographic or visual filter for direct solar viewing.

Viewing Versus Photography

Some products are intended for camera lenses, while others are shaped for telescope viewing. Camera filters must match the lens diameter and may affect focusing or exposure. Telescope filters should cover the full front aperture and should not be used in a way that concentrates unfiltered sunlight onto downstream optics.

Size and Coverage

Larger sheets offer more flexibility for making holders, but they do not automatically provide better views. Choose enough material to cover the entire front opening with a secure margin. For fixed-cap filters, verify both the telescope’s outside diameter and the usable aperture.

Who Should Buy Which Solar Observation Filters Under 100?

Telescope owners: Choose a dedicated EclipSmart or adjustable-cap filter when its listed dimensions match your instrument. These are generally easier to install securely than a loose sheet.

Camera users: Select a threaded filter that matches your lens diameter, such as a 37mm or 46mm option. Confirm that the filter is intended for solar photography and fits the lens thread exactly.

Binocular users and DIY builders: A properly mounted 6-by-6-inch, 8-by-8-inch, or 12-by-12-inch solar sheet provides sizing flexibility. Build or purchase a rigid holder that cannot slip off during use.

First-time buyers: Prioritize a purpose-built filter with clear compatibility information and secure retention. Whichever option you choose, examine it before every session, keep unfiltered optics covered until the filter is installed, and never look at the Sun through an unfiltered optical device.