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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

Solar Astronomy

The Sun is the only object in astronomy that changes visibly within an hour, and the only one that can permanently damage your eyes in a fraction of a second. Done with proper equipment, solar observing is the most accessible branch of the hobby — no dark sky, no late night, no travel. David Astro carries solar astronomy products in Canada: hydrogen-alpha telescopes, white-light filters, Calcium-K modules, wedges and dedicated solar accessories, in Canadian inventory and shipped domestically.

Safety here is absolute rather than a matter of degree, and we will not sell an unsafe combination. If you are unsure whether a filter or setup is appropriate, ask us before you point anything at the Sun.

Filters

$339.00 - $339.00
$339.00
$339.00 - $339.00
$339.00

Antlia Imaging Herschel Wedge with CaK 3nm Filter - 1.25"

ANT-CAK-WEDGE
1 in stock

Antlia Imaging Herschel Wedge with 35mm Prism and 1.25'' Cak 3nm Solar Filter The Antlia Solar Wedge (Herschel Wedge design) replaces the standard...

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$339.00 - $339.00
$339.00
$339.00 - $339.00
$339.00
$53.00 - $92.00
$53.00 - $92.00
$53.00 - $92.00
$53.00

Baader AstroSolar Binocular Filter OD 5.0 - 50-100mm

Options available
17 variants in stock

Optical Density 5.0 AstroSolar Safety Film Enables direct, safe viewing of the Sun Available in 50mm, 60mm, 70mm, 80mm, and 100mm clear aperture m...

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$53.00 - $92.00
$53.00 - $92.00
$53.00 - $92.00
$53.00
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00

Baader AstroSolar Photo Film OD 3.8

BAA-2459278
5 in stock

Optical Density 3.8: Specifically engineered for high-speed solar photography, not visual observation. Enables Short Exposures: Allows for shutt...

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$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00
$27.00 - $391.00
$27.00 - $391.00
$27.00 - $391.00
$27.00

Baader Astrosolar Safety Film OD 5.0

Options available
9 variants in stock

Optical Density 5.0 for safe, direct visual solar observation Does not degrade optical wavefront, preserving sharpness and contrast Available in m...

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$27.00 - $391.00
$27.00 - $391.00
$27.00 - $391.00
$27.00
$55.00 - $138.00
$55.00 - $138.00
$55.00 - $138.00
$55.00

Baader AstroSolar Spotting Scope Filter OD 5.0 - 50-150mm

Options available
9 variants in stock

Optical Density 5.0 for safe, direct solar viewing Available in 7 sizes from 50mm to 150mm Fits spotting scopes, binoculars, and small telescopes ...

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$55.00 - $138.00
$55.00 - $138.00
$55.00 - $138.00
$55.00
$101.00 - $249.00
$101.00 - $249.00
$101.00 - $249.00
$101.00

Baader AstroSolar Telescope Filter OD 5.0 - 80-280mm

Options available
27 variants in stock

Enables safe, high-resolution solar viewing and imaging Optical Density 5.0, blocking 99.999% of sunlight Available in apertures from 80mm to 280m...

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$101.00 - $249.00
$101.00 - $249.00
$101.00 - $249.00
$101.00
$335.00 - $335.00
$335.00
$335.00 - $335.00
$335.00

Baader Calcium GEN-II Filter - 1.25"

BAA-2961590

Calcium GEN-II Solar Filter 1.25" Barrel Size Reveals Chromospheric Detail Camera-Use Only (Not for Visual) Requires Full-Aperture Pre-Filter D...

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$335.00 - $335.00
$335.00
$335.00 - $335.00
$335.00
$660.00 - $750.00
$660.00 - $750.00
$660.00 - $750.00
$660.00

Baader Cool-Ceramic Safety Herschel Prism (Visual/Photographic)

Options available
2 variants in stock

Professional-grade white-light solar observing and imaging Cool-Ceramic prism design for safe heat dissipation Integrated solar finder for rapid, ...

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$660.00 - $750.00
$660.00 - $750.00
$660.00 - $750.00
$660.00
$496.00 - $2,559.00
$496.00 - $2,559.00
$496.00 - $2,559.00
$496.00

Baader D-ERF Energy Rejection Filter - 75-180mm

Options available

Full-aperture solar energy rejection filter Required for use with rear-mounted H-alpha etalon systems Advanced, hard dielectric IR-cut coatings Pr...

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$496.00 - $2,559.00
$496.00 - $2,559.00
$496.00 - $2,559.00
$496.00
$123.00 - $221.00
$123.00 - $221.00
$123.00 - $221.00
$123.00

Baader Digital Solar Filter 3.8 OD - 80-280mm

Options available

Optical Density 3.8 for ultra-short photographic exposures Available in sizes from 80mm to 280mm Tension-free film mounting for diffraction-limite...

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$123.00 - $221.00
$123.00 - $221.00
$123.00 - $221.00
$123.00
Baader Planetarium ASBF 50 – AstroSolar® Binocular Filter OD 5.1
$59.00 - $102.00
$59.00 - $102.00
$59.00 - $102.00
$59.00

Baader Planetarium ASBF – AstroSolar® Binocular Filter OD 5.1 – ClearWhite

Options available

Available for 50, 60, 70, 80 & 100mm Aperture Binoculars AstroSolar® White-Light Film Optical Density (OD) 5.1 for Visual Safety Clear, Neutra...

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$59.00 - $102.00
$59.00 - $102.00
$59.00 - $102.00
$59.00
Baader Planetarium ASSF 50 – AstroSolar® Spotter Filter OD 5.1 – ClearWhite
$61.00 - $152.00
$61.00 - $152.00
$61.00 - $152.00
$61.00

Baader Planetarium ASSF – AstroSolar® Spotter Filter OD 5.1 – ClearWhite

Options available

Available in seven sizes from 50mm to 150mm for spotting scopes, binoculars, finders and small telescopes Optical Density 5.1 for safe, direct vis...

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$61.00 - $152.00
$61.00 - $152.00
$61.00 - $152.00
$61.00
Baader Planetarium ASTF 80 – AstroSolar® Telescope Filter OD 5.1 – ClearWhite
$112.00 - $274.00
$112.00 - $274.00
$112.00 - $274.00
$112.00

Baader Planetarium ASTF – AstroSolar® Telescope Filter OD 5.1 – ClearWhite

Options available

Available in nine sizes from 80mm to 280mm (ASTF 80 to ASTF 280) to suit your telescope AstroSolar® Safety Film with Optical Density 5.1 Diffracti...

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$112.00 - $274.00
$112.00 - $274.00
$112.00 - $274.00
$112.00
Baader Planetarium AstroSolar® ClearWhite Safety Folie OD 5.1, 100x50cm
$139.00 - $492.00
$139.00 - $492.00
$139.00 - $492.00
$139.00

Baader Planetarium AstroSolar® ClearWhite Safety Film OD 5.1

Options available

Certified AstroSolar® Safety Film Optical Density 5.1 for Visual Use Available as 100x50cm or Giant-size 117x117cm Sheet "ClearWhite" Neutral Colo...

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$139.00 - $492.00
$139.00 - $492.00
$139.00 - $492.00
$139.00
Baader Planetarium D-ERF Energy Rejection Filter - 290mm Aperture, 20mm Thickness
$8,290.00 - $8,290.00
$8,290.00
$8,290.00 - $8,290.00
$8,290.00

Baader Planetarium D-ERF Energy Rejection Filter - 290mm Aperture, 20mm Thickness

BAA-2965000D

290mm Clear Aperture 20mm Thick Glass Substrate IR-Cut Dielectric Coating Pre-Filter for H-Alpha Solar Systems Description FAQ Specifications I...

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$8,290.00 - $8,290.00
$8,290.00
$8,290.00 - $8,290.00
$8,290.00
Baader Planetarium Solar / Eclipse Viewer AstroSolar® Silver/Gold
$3.55 - $289.49
$3.55 - $289.49
$3.55 - $289.49
$3.55

Baader Planetarium Solar / Eclipse Viewer AstroSolar® Silver/Gold

Options available

Safe for direct, naked-eye solar viewing Ideal for observing the partial phases of a solar eclipse and large sunspot groups Available as a single ...

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$3.55 - $289.49
$3.55 - $289.49
$3.55 - $289.49
$3.55
Baader Planetarium Solar Diaphragm 13mm - 113mm, stepless adjustable
$445.00 - $445.00
$445.00
$445.00 - $445.00
$445.00

Baader Planetarium Solar Diaphragm 13mm - 113mm, stepless adjustable

BAA-2459300

Steplessly Adjustable Aperture: 13mm to 113mm Ideal for Optimizing Solar Views in Refractors DIY Mounting Pattern: Four M3 threads Standard Pitch ...

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$445.00 - $445.00
$445.00
$445.00 - $445.00
$445.00
Baader Planetarium Baader Solar Projection Screen (BSPS)
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

Baader Planetarium Solar Projection Screen (BSPS)

BAA-2420400

Safe, Enclosed Solar Projection Ideal for Group Viewing and Public Outreach Observe Sunspots, Limb Darkening, and Eclipses Compatible with T-2 Eye...

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$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
Baader Planetarium Solar Shade with 2" drilled hole
$71.00 - $71.00
$71.00
$71.00 - $71.00
$71.00

Baader Planetarium Solar Shade with 2" drilled hole

BAA-2959280

Blocks stray sunlight to improve contrast Reduces heat buildup around the eyepiece Installs between any 2-inch threaded accessories Features a 2-i...

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$71.00 - $71.00
$71.00
$71.00 - $71.00
$71.00
Baader Planetarium Solar Shade with M68 drilled hole
$73.00 - $73.00
$73.00
$73.00 - $73.00
$73.00

Baader Planetarium Solar Shade with M68 drilled hole

BAA-2959281

Protects Imaging Equipment from Solar Heating Clamps Securely Between Any M68 Threads Reduces Tube Currents and Thermal Instability Lightweight an...

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$73.00 - $73.00
$73.00
$73.00 - $73.00
$73.00
Baader Planetarium Solar Shade with T-2 Drilled Hole
$70.00 - $70.00
$70.00
$70.00 - $70.00
$70.00

Baader Planetarium Solar Shade with T-2 Drilled Hole

BAA-2959279

T-2 Thread-Through Design Installs Between Any T-2 System Components Shields Equipment from Direct Solar Radiation Reduces Internal Reflections an...

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$70.00 - $70.00
$70.00
$70.00 - $70.00
$70.00
Baader Planetarium TZ-3S Telecentric System T-2 for SunDancer II and more
$459.00 - $459.00
$459.00
$459.00 - $459.00
$459.00

Baader Planetarium TZ-3S Telecentric System T-2 for SunDancer II and more

BAA-1363070

3x Achromatic Telecentric System Delivers a Parallel Light Beam for H-alpha Filters Illuminates a 27.5mm Image Circle 96mm Working Distance from T...

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$459.00 - $459.00
$459.00
$459.00 - $459.00
$459.00
Baader Planetarium TZ-4S Telecentric System T-2 for SunDancer II and more
$481.00 - $481.00
$481.00
$481.00 - $481.00
$481.00

Baader Planetarium TZ-4S Telecentric System T-2 for SunDancer II and more

BAA-1363080

Creates a parallel beam of light required for H-alpha solar filters Higher magnification factor for using solar filters on faster telescopes Maint...

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$481.00 - $481.00
$481.00
$481.00 - $481.00
$481.00
$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

Baader Solar Continuum Double Stacked Filter - 1.25"

BAA-2458392

1¼" Double Stacked Baader Solar Continuum Filter. 8nm / CWL 540nm. Includes 1x AstroSolar®Photo Film OD 3.8 20x29 cm. The filter includes two Baad...

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$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

Ways to Observe the Sun Safely

Different wavelengths reveal completely different Suns. White light shows the photosphere and sunspots; hydrogen-alpha shows the chromosphere with prominences and filaments; Calcium-K shows the plage network above it.

  • White-light filters: Full-aperture film or glass filters fitted in front of the objective, showing sunspots, granulation and faculae. They must always be at the front, never at the eyepiece.
  • Hydrogen-alpha telescopes: Dedicated instruments with sub-angstrom etalons that isolate the 656.28 nm line, revealing prominences at the limb and filaments and flares on the disc.
  • Solar filter modules: Etalon and blocking filter assemblies that convert a suitable refractor into a hydrogen-alpha instrument.
  • Calcium-K filters: Narrow filters at 393 nm showing the chromospheric network, best captured with a camera since the wavelength is at the edge of human sensitivity.
  • Herschel wedges: High-contrast white-light observing for refractors, diverting most solar energy out of the optical path rather than reflecting it back.
  • Solar accessories: Finders, blocking filters, tuning aids and mounting hardware designed for daytime work.

Why Choose David Astro for Solar Astronomy

This is the one category where getting the recommendation wrong has consequences beyond a disappointing view.

  • Safety verified, not assumed: We confirm that any filter is full-aperture and front-mounted, and we will not supply eyepiece-end solar filters, which can fail catastrophically under concentrated heat.
  • Aperture limits for etalon modules: Front-mounted etalons have maximum aperture and focal ratio limits, and exceeding them risks both poor performance and thermal damage. We check your telescope against them.
  • Authorized dealer: Genuine solar equipment with full manufacturer warranty — critically important in a category where counterfeit filters exist.
  • Canadian stock: Ships from Canada, with no duties or brokerage fees for Canadian orders.
  • Inspection and service: We can inspect solar filters for pinholes and coating damage, which should be done before every season.

Solar Astronomy in Canada — Frequently Asked Questions

Can I use an eyepiece-mounted solar filter?
No. Filters that screw into an eyepiece sit where the telescope has concentrated the Sun's full energy, and they can crack without warning. Only full-aperture filters mounted at the front of the telescope are safe.
White light or hydrogen-alpha first?
White light is far less expensive and shows sunspots and granulation well. Hydrogen-alpha shows prominences and surface activity that white light cannot, and is the more dramatic view, at several times the cost.
How do I know my filter is still safe?
Hold it up to a bright indoor light and look for pinholes, scratches or delamination in the coating. Any visible defect means it should be replaced, not repaired or taped.
Can I observe the Sun in winter?
Yes, and low winter sun means long atmospheric path and often poor seeing, but activity is visible year round. Cold also keeps etalon tuning more stable than a hot summer afternoon does.

Starting with solar observing?

Tell us your telescope and we will confirm a safe, effective setup. Genuine filters, Canadian stock, expert guidance.