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

Choosing a solar filter is about more than finding a piece of dark material that fits your equipment. The right filter must be designed for direct-sun viewing, fit securely, and suit your telescope, camera lens, or binoculars.

These 10 solar observation filters under $100 include fitted telescope caps, threaded camera filters, and cut-to-size solar film sheets. Use the guide below to compare compatibility, safety features, and the best match for your setup.

Best 10 Solar Observation Filters Under 100 Picks for 2026

Best Telescope Fit – Celestron EclipSmart 127/130mm Filter

For shoppers comparing solar observation filters under 100, the Celestron EclipSmart is a purpose-built option for select 127mm and 130mm reflector telescopes. Its ISO 12312-2:2015(E) compliance, secure straps, and protective cap make it practical for viewing eclipses, sunspots, or the Sun on any day.

Best For: Owners of compatible Celestron 127mm or 130mm reflector telescopes who want a securely attached filter for visual observing and solar imaging.

Pros:

• Conforms to the ISO 12312-2:2015(E) international safety standard.
• Includes two hook-and-loop straps and a safety cap for secure use and storage.
• Orange-tinted Solar Safe film provides a natural-looking view and is made in the USA.
• Backed by a two-year US warranty and unlimited support from Celestron.

Cons:

• Compatibility is limited to select 127mm and 130mm reflector models.
• It is not a universal camera-lens or telescope filter.

This is a strong fit when your telescope matches the listed models. Confirm the optical tube and model compatibility before buying, since the snug attachment design is tailored to those reflectors.

Best for 46mm Camera Lenses – Hyperion Threaded Solar Filter

Among solar observation filters under 100, the Hyperion Solar Film filter is tailored to camera users with a 46mm lens thread. It screws onto the front of the lens for solar photography and uses independently tested film designed 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 photograph eclipses, sunspots, and other solar features.

Pros:

• Threaded design attaches directly to compatible 46mm camera lenses.
• Solar film was independently tested to block 99.999% of the Sun’s rays.
• Made in the USA by Seymour Solar, a manufacturer recommended by the American Astronomical Society.
• Comes with a foam case for storage and protection.

Cons:

• Only fits lenses with a 46mm filter thread.
• The 90-day guarantee requires the product to remain in its sealed plastic bag for returns.

This is a focused choice for camera-based solar photography rather than telescope viewing. Verify your lens thread size and follow the manufacturer’s installation and use instructions before pointing the camera at the Sun.

Best Adjustable Telescope Cap – Astromania 75mm Aperture Filter

For shoppers seeking solar observation filters under 100, the Astromania Deluxe filter offers an adjustable metal cap for telescope tubes measuring 70mm to 92mm in outer diameter. Its 75mm aperture, aluminum cell, and three clamping screws are designed for a snug, protected fit.

Best For: Telescope owners whose optical tubes have a 70mm-to-92mm outer diameter and need an adjustable front-aperture solar filter.

Pros:

• Adjusts to telescope tubes with outer diameters from 70mm to 92mm.
• Meets ISO 12312-2:2015 requirements according to the supplied product notes.
• Uses Baader Astro film in a sturdy anodized aluminum cell.
• Three clamping screws with protective caps help secure the filter while protecting the telescope.

Cons:

• It is not suitable for tubes outside the specified 70mm-to-92mm diameter range.
• The film may show wavy lines because of its larger diameter, though the notes state this does not affect observation.
• The filter is not water resistant.

This model stands out when adjustable mounting matters more than a fixed telescope-specific fit. Measure the tube’s outer diameter carefully and inspect the film before every use; do not use the filter if it is damaged.

Best Storage-Friendly Camera Filter – Spectrum Telescope 37mm Camera Filter

The Spectrum Telescope 37mm filter is a practical camera-focused pick among solar observation filters under 100. Its threaded 37mm format, full-aperture optical film, and included protective packaging suit photographers who want a natural yellowish-orange solar image and convenient filter storage.

Best For: Camera users with a 37mm filter thread who want a full-aperture solar filter for viewing or photographing the Sun.

Pros:

• Threaded 37mm design fits compatible camera lenses or accessories.
• Full-aperture film allows a safe amount of light through for solar viewing and imaging.
• Produces a natural-looking yellowish-orange image.
• Ships in a foam-lined box inside a plastic box that can be reused for storage.

Cons:

• Compatibility is limited to equipment with a 37mm thread.
• The supplied notes do not specify an ISO safety standard.
• It carries a 30-day manufacturer warranty.

This filter makes sense for photographers who value a compact threaded format and protective storage. Confirm the 37mm thread size and follow the provided care and use instructions to preserve the polymer film.

Best Dedicated 6-Inch Fit – EclipSmart Solar Telescope Filter

For shoppers comparing solar observation filters under 100, the Celestron EclipSmart is a ready-to-use choice for compatible 6-inch Schmidt-Cassegrain telescopes. It is designed for viewing eclipses and sunspots, with an orange tint intended to provide a natural-looking solar image.

Best For: Owners of compatible Celestron 6-inch telescopes who want a fitted filter rather than a DIY sheet.

Pros:

• Conforms to the ISO 12312-2:2015(E) safety standard listed by the manufacturer.
• Compatible with several Celestron 6-inch optical tube and telescope models.
• Two hook-and-loop straps help secure it to the telescope objective.
• Includes a 2-year US warranty and support from Celestron.

Cons:

• Compatibility is limited to listed 6-inch telescope configurations.
• The orange-tint design may not suit shoppers seeking a different solar image appearance.

This is the most convenient option here for users with a matching Celestron telescope. Confirm your telescope model and objective size before ordering.

Best DIY Versatility – BP-12 Solar Filter Sheet

Among solar observation filters under 100, the Thousand Oaks Optical BP-12 stands out as a flexible 12-by-12-inch sheet. It can be cut or formed for use with telescopes, binoculars, cameras, finders, or a pocket eclipse viewer, making it useful for custom projects.

Best For: DIY builders who need a larger sheet for adapting solar protection to multiple devices.

Pros:

• 12-by-12-inch size provides material for custom filter construction.
• 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.
• Made in the USA according to the supplied product notes.

Cons:

• Requires the buyer to make or adapt the filter mount.
• Ships in cardboard and does not include a storage case.
• The manufacturer warns that unprotected sight blocks must be removed or covered.

This sheet offers the broadest device flexibility in the group, but safe construction is the buyer’s responsibility. Plan the mount carefully and ensure every optical path is protected before use.

Best Compact Camera Fit – 101mm Black Polymer Filter

For shoppers seeking solar observation filters under 100 in a compact format, the Rainbow Symphony 101mm Black Polymer filter is sized at 10.1 centimeters. Its supplied compatibility information specifically lists cameras, so verify the required fit before purchasing.

Best For: Camera users whose equipment accepts a 101mm or 10.1-centimeter filter size.

Pros:

• Compact 101mm (10.1-centimeter) size.
• Listed as compatible with cameras.
• Black polymer construction and multi-coating are specified in the product details.

Cons:

• The supplied notes list camera compatibility but do not provide a broader telescope or binocular fit.
• Mounting style and included storage accessories are not specified.
• Confirm the product’s dimensions and your camera setup before ordering.

This is a focused option for a camera-based setup rather than a universal sheet. Its main advantage is the defined 101mm size, provided that measurement matches your equipment.

DIY Large-Aperture Pick – 6-Inch Solar Filter Sheet

For shoppers comparing solar observation filters under 100, this 6-by-6-inch Thousand Oaks Optical polymer sheet is a flexible DIY option for telescopes, binoculars, and cameras. It produces a natural orange-colored view of the Sun while letting you create a custom-fit filter.

Best For: DIY users who need a larger sheet for adapting to different optical equipment.

Pros:

• Works with telescopes, binoculars, and cameras.
• Large 6-by-6-inch format supports custom filter making.
• Silver-black polymer is intended for viewing sunspots and granulation.
• Costs a fraction of many factory-made filters, according to the supplied product notes.

Cons:

• Requires you to make the filter yourself.
• Must be securely attached with sticky tape before observing.
• The sheet is not water resistant.

This is a practical choice when size and adaptability matter more than a ready-to-use mount. Take extra care during construction and verify that the finished filter remains firmly attached throughout observation.

Ready-to-Use Universal Pick – Celestron EclipSmart Solar Filter

Among solar observation filters under 100, the Celestron EclipSmart stands out as a ready-to-use option for objective lenses measuring 75mm to 100mm outside diameter. Its adjustable panels and elastic band are designed for a secure fit on compatible telescopes, spotting scopes, and DSLR cameras.

Best For: Users who want a folding, adjustable filter for compatible 75mm-to-100mm equipment.

Pros:

• Conforms to the ISO 12312-2:2015(E) international safety standard, according to the supplied notes.
• Fits objective lenses with outside diameters from 75mm to 100mm.
• Folds flat and includes a reusable storage bag.
• Includes a two-year US warranty and US-based support.

Cons:

• Compatibility is limited to the stated 75mm-to-100mm objective diameter range.
• It is not water resistant.
• It may be less suitable than a sheet for unusually shaped or custom-sized setups.

For compatible equipment, this is the simplest option in the group because it avoids DIY construction. Confirm your objective diameter before ordering, then use the adjustable panels and elastic band as intended.

Compact DIY Value Pick – 4-Inch Solar Filter Sheet

This 4-by-4-inch Thousand Oaks Optical sheet is a compact choice for shoppers seeking solar observation filters under 100. The black polymer material can be used to make a custom filter for telescopes, binoculars, or cameras and produces a natural orange solar image.

Best For: Smaller optical setups and budget-conscious users comfortable making a filter.

Pros:

• Compatible with telescopes, binoculars, and cameras.
• Compact 4-by-4-inch size is suited to smaller DIY projects.
• Designed for observing sunspots and granulation.
• The supplied notes state that the polymer is stronger than Mylar and has filtering properties protected within the substrate.

Cons:

• Requires a homemade filter mount.
• Needs to be securely attached with sticky tape before use.
• The smaller sheet may not cover larger objective openings.

This sheet offers a straightforward, economical route to a custom solar filter when a 4-inch format is sufficient. Measure your equipment first and prioritize a firm, secure attachment before observing.

How We Picked the Best Solar Observation Filters Under 100

We focused on filters intended for direct solar observation or photography, prioritizing established solar-filter materials, secure attachment methods, and compatibility information. The selection includes products for reflectors, telescopes, cameras, binoculars, and users who need flexible sheet material. We also considered aperture, thread size, outer diameter, ISO-related claims, adjustability, and whether the design is reusable or better suited to a specific viewing session.

Before buying, verify the manufacturer’s intended use and inspect the filter for pinholes, scratches, tears, or loose fittings. Never use an ordinary photographic filter, smoked glass, exposed film, or improvised material for solar viewing.

Quick Comparison

• Best for compatible reflector telescopes: A fitted Celestron EclipSmart model can provide a more straightforward installation when its stated aperture matches your telescope.
• Best for camera lenses: Threaded filters are convenient when the filter diameter matches the lens exactly.
• Best for flexible sizing: Solar filter sheets can be cut and mounted for different instruments, but they require careful, secure construction.
• Best for adjustable telescope fit: An adjustable metal-cap design may accommodate a range of tube diameters within its specifications.

Key Buying Factors for Solar Observation Filters Under $100

Fit and Attachment

A filter should cover the full objective or aperture and remain firmly attached if the equipment is bumped or moved. For telescope caps, compare the listed outside diameter with your tube—not just the telescope’s advertised aperture. For camera filters, match the thread diameter, such as 37mm or 46mm, and confirm whether an adapter is needed.

Filter Material and Intended Use

Solar film, black polymer, and other purpose-built materials can produce different visual appearance and durability characteristics. Choose a product explicitly labeled for safe solar observation or solar photography. A camera filter is not automatically suitable for visual use, and a telescope filter may not be appropriate for a camera lens.

Optical Coverage and Image Goals

For visual observing, even coverage and a secure fit are essential. For photography, consider the lens or telescope focal length, exposure control, and whether you want a natural-colored or more stylized solar image. A larger sheet offers mounting flexibility, while a threaded filter is typically faster to install.

Condition and Storage

Inspect any reusable filter before every session. Store sheets flat or in their protective packaging, keep caps away from sharp edges, and replace any filter showing damage. Do not stack materials or assume that extra darkness improves safety.

Who Should Buy Which Solar Observation Filters Under 100?

Owners of compatible 127mm, 130mm, or 6-inch reflector telescopes should start with a correctly sized fitted EclipSmart model. Telescope users with less common tube dimensions may prefer an adjustable cap or a larger sheet that can be mounted securely. Camera owners should choose a threaded filter matching the lens diameter, while photographers using several lenses may find a sheet more adaptable.

For binoculars or custom projects, a solar filter sheet can work well when each objective receives its own properly secured filter. If you want the simplest setup, select a dedicated cap or threaded filter with verified measurements. Whichever option you choose, prioritize certified or purpose-built solar-filter material and secure attachment over price alone.