Research Filters

Astrodon introduced the ExoPlanet-BB filter for use in amateur-scale telescopes to measure light curves of exoplanets. Although it may not seem possible at first, astronomers with typical backyard equipment and sensitive CCD cameras have the capability...

Spectral profiles designed after U, B, V, Rc, Ic Johnson/Cousins Improved B filter (B***) extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters 100% coated – no colored...

Spectral profiles designed after U, B, V, Rc, Ic Johnson/Cousins Improved B filter (B***) extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters 100% coated – no colored...

Spectral profiles designed after U, B, V, Rc, Ic Johnson/Cousins Improved B filter (B***) extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters 100% coated – no colored...

Spectral profiles designed after U, B, V, Rc, Ic Johnson/Cousins Improved B filter (B***) extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters 100% coated – no colored...

Spectral profiles designed after U, B, V, Rc, Ic Johnson/Cousins Improved B filter (B***) extending blocking >1100 nm and eliminating small light leaks that affected measurements of reddest stars in our initial filters 100% coated – no colored...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

50% transmission points provided above (+/- 3nm typical) Peak transmission guaranteed > 95%  (>90% for u’) <=0.03%Tabs out-of-band 300 – 1100 nm Single striae-free fused silica substrates 1/4-wave propagated wavefront prior to...

With side flapFor diamter 40.5mm - 41.5mm

For Solar Observation use only in combination with Baader AstroSolar Safety Film!Eliminates the color error of economy refractors.Clearly puts the real quality of the lens on display.Removes the bluish "hue" (=lack of contrast) during lunar-, planetary-,...

The Baader Hyperion 8-24mm Clickstop Zoom continues the Hyperion tradition of delivering top-of-class performance and quality, at very reasonable prices. Zoom eyepieces have earned a lackluster reputation over the years, due to their compromises in...

Baader Hyperion Eyepiece 13mmHuge 68 degree wide angle field, tailored to the maximum Visual angle of the human eyePhantom group coatings in Zeiss class for complete freedom of reflections and maximum image contrastModular design of the eyepiece body...

Baader Planetarium Q-Barlow 2.25x / 1.3xThis high-quality 2.25x Barlow made of exotic glasses provides the rare extension factor of 2.25x. So, there are no duplicate focal lengths when used with the eyepieces of the Q-Turret Set, and you can achieve...

Baader UBVRI - Filterset, 1 each of U, B, V, R, I FilterPhotometric Johnson/Bessel filter systemPartial dielectric design with BBAR minimized reflectionsPlaneoptically polished, 4mm glass thicknessNon-aging sealed coating edgesBaader UBVRI Filters -...

The Baader Planetarium UHC-S Nebula filter excels at delivering a high-contrast and natural view of emission nebula - without excessive dimming and loss of background star fields. The perfect filter for viewing emission nebula from light polluted skies,...