Alpine Astronomical Baader H-beta Narrowband Filter (2" Eyepiece Filter) FCHBN-2

Alpine Astronomical Baader 4nm Ultra-Narrowband O-III CMOS Filter (2" Eyepiece Filter) FCOIIINU-2

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Alpine Astronomical Baader 6.5nm Narrowband O-III CMOS Filter (1.25" Eyepiece Filter) FCOIIIN-1

[Pre Order - allow extra time] Alpine Astronomical Baader 6.5nm Narrowband O-III CMOS Filter (1.25" Eyepiece Filter) NULL ... more

Alpine Astronomical Baader Contrast Booster Filter (2" Eyepiece Filter) FCNBST-2

[Pre Order - allow extra time] Alpine Astronomical Baader Contrast Booster Filter (2" Eyepiece Filter) Eliminates Color Error of Refractors, Reduces Bluish Hue During Viewing, Over 95% Transmission, Phantom Coating ... more

Alpine Astronomical Baader CMOS-Optimized UV/IR Bandpass L Filter (2" Eyepiece Filter) FCUVIR-2

This 2 Eyepiece Filter Baader CMOS-Optimized UV/IR Bandpass L Filter from Alpine Astronomical reflects harmful thermal radiation in the infrared spectral range and provides 98% transmission over the entire visible spectrum from 420-685nm. It also... ... more

Alpine Astronomical Baader UFC Filter Slider for 2" Eyepiece Filters UFC-2

[Pre Order - allow extra time] Alpine Astronomical Baader UFC Filter Slider for 2" Eyepiece Filters Part of the UFC Filter Changer System, For Use with Optional UFC Filter Base, Enables Fast Filter Changes, Secures Magnetically to Base ... more

Alpine Astronomical Baader SLOAN/SDSS u' Filter (2" Eyepiece Filter) FSLN-2U

[Pre Order - allow extra time] Alpine Astronomical Baader SLOAN/SDSS u' Filter (2" Eyepiece Filter) SLOAN-u' Bandpass Filter, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader 6.5nm Narrowband Filter Set (2") FCSETN-2

[Pre Order - allow extra time] Alpine Astronomical Baader 6.5nm Narrowband Filter Set (2") 3 Filter Set: H-alpha, O-III, and S-II, For f/10 to f/3.5 Optical Systems, CMOS-Optimized / Suitable for CCD, 6.5nm FWHM, Reflex-Blocker / Life-Coat, Blackened... ... more

Alpine Astronomical Baader UBVRI Bessel V Filter (1.25" Eyepiece Filter) FBES-1V

[Pre Order - allow extra time] Alpine Astronomical Baader UBVRI Bessel V Filter (1.25" Eyepiece Filter) Photometric Filter: V Bandpass, Suitable from f/15 to f/1.8, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader SLOAN/SDSS g' Filter (1.25" Eyepiece Filter) FSLN-1G

[Pre Order - allow extra time] Alpine Astronomical Baader SLOAN/SDSS g' Filter (1.25" Eyepiece Filter) SLOAN-g' Bandpass Filter, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader CMOS-Optimized LRGB Bandpass Filterset (2" Eyepiece Filter) FCLRGB-2

This Baader CMOS‑Optimized LRGB Bandpass Filterset from Alpine Astronomical includes all three RGB filters plus the UV-IR Bandpass L filter. ... more

Alpine Astronomical Baader H-alpha Narrowband Filter (36mm Round) FCHALN-RD36

This 36mm Round Baader H-beta Narrowband Filter from Alpine Astronomical is a 6.5nm FWHM filter recommended for optical systems from f/10 to f/3.5. It features a Reflex-Blocker hard coating which has been planeoptically polished and has Life-Coat... ... more

Alpine Astronomical Baader H-alpha Narrowband Filter (1.25") FCHALN-1

Free Express Shipping! Alpine Astronomical Baader H-alpha Narrowband Filter (1.25") 6.5nm FWHM, Ideal from f/10 to f/3.5, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader 6.5nm Narrowband Filter Set (1.25") FCSETN-1

The 1.25 Baader 6.5nm Narrowband Filter Set from Alpine Astronomical features three precision-grade filters designed for f/10 to f/3.5 optical systems. The set includes H-alpha O-III and S-II filters optimized for CMOS sensor cameras and also suitable... ... more

Alpine Astronomical Baader CMOS-Optimized LRGB Bandpass Filterset (1.25" Eyepiece Filter) FCLRGB-1

[Pre Order - allow extra time] Alpine Astronomical Baader CMOS-Optimized LRGB Bandpass Filterset (1.25" Eyepiece Filter) Includes UV/IR Cut and R/G/B Filters, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader 1.8 Neutral Density Filter (1.25") FND2-1

Free Express Shipping! Alpine Astronomical Baader 1.8 Neutral Density Filter (1.25") Ideal for Lunar Observation, Phantom Group Optical Coatings, Fits 1.25" Eyepieces and Accessories, 1.8 Optical Density, 1.0% Transmission, 64 Reduction Factor,... ... more

Alpine Astronomical Baader 3.5/4nm f/2 Ultra-High-Speed Filter Set CMOS-Optimized (2") FCSETHSU-2

[Pre Order - allow extra time] Alpine Astronomical Baader 3.5/4nm f/2 Ultra-High-Speed Filter Set CMOS-Optimized (2") 3-Filter Set: H-alpha, O-III, and S-II, For f/3.4 to f/1.8 Optical Systems, CMOS-Optimized and Suitable for CCDs, Reflex-Blocker /... ... more

Alpine Astronomical Baader 2" Filter Holder for DSLR Camera Lens DSLR-2

[Pre Order - allow extra time] Alpine Astronomical Baader 2" Filter Holder for DSLR Camera Lens Mount 2" Eyepiece Filters on Camera Lens, Ideal for Wide-Field Astrophotography, Holder Only - Baader DT Ring Required ... more

Alpine Astronomical Baader Neodymium Moon & Skyglow Filter (2") FMS-2

Primarily developed to filter interfering light from streetlamps and the scattered atmospheric light that they and the moon can cause the 2 Alpine Astronomical Baader Neodymium Moon & Skyglow Filter can be used by itself or stacked with other types of... ... more

Alpine Astronomical Baader Solar Continuum Filter 7.5nm (540nm, 2") FSOL-2N

Free Express Shipping! Alpine Astronomical Baader Solar Continuum Filter 7.5nm (540nm, 2") Enhances Contrast in Solar Viewing, Filter Centered on 540nm Wavelength, Narrow 7.5nm Half-Bandpass, AR-Coated, Planeoptically Polished ... more

Alpine Astronomical Baader 6.5nm f/2.0 Highspeed CMOS Filter Set (50x50mm Square, Unmounted) FCSETHS-SQ50

[Pre Order - allow extra time] Alpine Astronomical Baader 6.5nm f/2.0 Highspeed CMOS Filter Set (50x50mm Square, Unmounted) NULL ... more

Alpine Astronomical Baader 0.6 Neutral Density Filter (1.25") FND0-1

Free Express Shipping! Alpine Astronomical Baader 0.6 Neutral Density Filter (1.25") Ideal for Lunar Observation, Phantom Group Optical Coatings, Fits 1.25" Eyepieces and Accessories, 0.6 Optical Density, 25% Transmission, 4 Reduction Factor, Stackable... ... more

Alpine Astronomical Baader CMOS-Optimized UV/IR Bandpass L Filter (36mm Round, Unmounted) FCUVIR-RD36

[Pre Order - allow extra time] Alpine Astronomical Baader CMOS-Optimized UV/IR Bandpass L Filter (36mm Round, Unmounted) UV/IR Cut: 420-685nm, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader Astrophotography H-alpha Conversion Filter for Canon EOS Digital Reb FACF-1

Free Express Shipping! Alpine Astronomical Baader Astrophotography H-alpha Conversion Filter for Canon EOS Digital Rebel Isolates Hydrogen-Alpha Wavelength, Converts DSLR to Dedicated Astro Camera, Replaces Factory Cover Glass, Maintains Correct... ... more

Alpine Astronomical Baader Solar Continuum Filter 7.5nm (540nm, 1.25") FSOL-1N

Free Express Shipping! Alpine Astronomical Baader Solar Continuum Filter 7.5nm (540nm, 1.25") Enhances Contrast in Solar Viewing, Filter Centered on 540nm Wavelength, Narrow 7.5nm Half-Bandpass, AR-Coated, Planeoptically Polished ... more

Alpine Astronomical Baader SLOAN/SDSS ugriz' Filterset (36mm Round, Unmounted) FSLNSET-RD36

[Pre Order - allow extra time] Alpine Astronomical Baader SLOAN/SDSS ugriz' Filterset (36mm Round, Unmounted) Includes u, g, r, i, z-s, and y' Filters, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more

Alpine Astronomical Baader CMOS-Optimized RGB Bandpass Filterset (50 x 50mm Square, Unmounted) FCRGB-SQ50

[Pre Order - allow extra time] Alpine Astronomical Baader CMOS-Optimized RGB Bandpass Filterset (50 x 50mm Square, Unmounted) Includes R, G, and B Bandpass Filters, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed... ... more

Alpine Astronomical Baader SLOAN/SDSS ugriz' Filterset (50.4mm Round, Unmounted) FSLNSET-RD50

[Pre Order - allow extra time] Alpine Astronomical Baader SLOAN/SDSS ugriz' Filterset (50.4mm Round, Unmounted) Includes u, g, r, i, z-s, and y' Filters, Optimized for CMOS, Suitable for CCD, Reflex-Blocker Hard Coated, Life-Coat Sealed Coating Edges ... more