Its popularity does not come from its ruggedness nor its out-of-the-box convenience. Whether bought as a loose sheet for making filters or as ready-made Baader solar filters for binoculars, camera lenses and telescopes, it enables super-sharp captures of sunspots on the sun, allowing much faster shutter speeds than some rival solar filter materials.
Baader AstroSolar Film can be used to make solar filters for all kinds of equipment.Jamie CarterBaader AstroSolar Film can be used for all kinds of solar images.Jamie CarterThin and delicatePerfect for crafting homemade solar filtersAvailable as A4 and A5 sheets and ready-made filters
The defining feature of Baader AstroSolar Filter Film is how little there is to it. The film is extremely thin — around 0.01 mm — and feels much more fragile than tougher solar polymer materials. That can be disconcerting the first time you handle it. It wrinkles easily, but should never be pulled tight. However, initial fears are misplaced because a good homemade solar filter does not require the film to be flat. In fact, it should be mounted slightly slack, because wrinkles and ripples in the filter material actually improve the image.
Key specifications:
Product type: AstroSolar Safety Film OD 5.0 solar filter filmMaterial: Metalized filmThickness: Around 0.01 mmLight reduction: OD 5.0 blocks 99.999% of visible sunlightSolar color: Neutral whiteFormats: Loose sheets and pre-made filters
They are, of course, neater and more durable than homemade cardboard versions, but the optical principle is exactly the same. Besides, the loose sheet version is more attractive if you have several lenses or binoculars to cover, or if you want to make a filter that precisely fits a specific lens hood.
Baader AstroSolar Filter Film OD 5.0: Performance
An image of a partial solar eclipse in 2023, taken using a Baader filter.Jamie CarterAstroSolar Film gives the sun a neutral white appearance.Jamie CarterSharp solar detailNeutral white colorSuits cameras and binocularsThat white rendering will not be to everyone’s taste. Casual eclipse watchers often expect the sun to look orange through solar filters because that is how it often appears through eclipse glasses and some glass or polymer solar filters. Baader’s version is a lot more clinical. For photographers, however, that is an advantage. A neutral white solar disk is easy to warm up later in editing, while a heavily colored orange image gives a little less flexibility. It all depends on your point of view.
On a 400mm, 500mm or 600mm lens, where sunspots and the edge of the solar disk matter more, Baader AstroSolar Film OD 5.0 shows why it has such a strong reputation among eclipse photographers. In our tests at 400m set to f/8 and ISO 100, we found that exposures of 1/800s and 1/1,000s achieved the best results.
An image of the sun using 1/2,000s exposure. Jamie CarterAn image of the sun using 1/1,000s exposure. Jamie CarterAn image of the sun using 1/800s exposure. Jamie CarterAn image of the sun using 1/250s exposure. Jamie CarterThe use of Baader AstroSolar Film is, of course, solely for capturing the partial phases of a solar eclipse, allowing safe imaging of the shrinking solar crescent. If you’re in the path of totality and about to watch a total solar eclipse, you’ll need to gently remove the filter when it gets dark.
Homemade filters can be built from the A3 or A4 sheets of AstroSolar film.Jamie CarterReady-made Baader solar filters use the same core AstroSolar material.Jamie CarterEasy to use for DIY projectsWorks across many optical devicesSafety checks required
If you buy a solar filter that uses Baader AstroSolar Filter Film OD 5.0, you have an excellent product that requires care when traveling and storing. If you purchase it as a sheet of material, it requires some time and patience as well as cardboard, tape, glue and scissors to custom-build your own Baader AstroSolar Solar Filter for almost any optical device. That’s a huge advantage over many screw-in photographic filters, which only fit specific thread sizes.
Related articles:
Best eclipse glassesBest solar binocularsBest solar viewing equipment7 ways to photograph the solar eclipseWhich solar viewing method is right for you?Best smart telescopes
Whether your solar filter is pre-made or homemade, it’s important to inspect it before use, especially when using Baader AstroSolar Filter Film. Any holes, tears, or scratches are reasons to stop using the filter.
Should you buy Baader AstroSolar Filter Film?
Buy it if:Don't buy it if:
❌ You want the simplest possible eclipse-viewing option.❌ You don’t have the patience to craft your own solar filter.❌ You prefer an orange solar image.
However, for photographers and binocular users, it’s hard to beat. It is light, sharp, adaptable and available in various forms for different solar imaging needs. Its greatest strength is that it allows you to create exactly the filter you need, whether that’s for a 400mm camera lens, one side of a pair of binoculars, a compact travel telescope or any other equipment.
Treat it gently and mount it securely, and Baader AstroSolar Filter Film remains one of the most useful solar filter materials available.
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