Alpine Astronomical Baader 3.5nm Ultra-Narrowband H-alpha CMOS Filter (2" Eyepiece Filter) FCHALNU-2

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 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 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 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 H-beta Narrowband Filter (2" Eyepiece Filter) FCHBN-2

[Pre Order - allow extra time] Alpine Astronomical Baader H-beta Narrowband Filter (2" Eyepiece Filter) 5.5nm 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 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 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 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 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 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 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 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 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 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 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

Free Express Shipping! Alpine Astronomical Baader Neodymium Moon & Skyglow Filter (2") Improves Color and Contrst, UV/IR Luminance Blocking Coating, Filters Streetlights and Moon Skyglow, Isolates Red, Green, and Blue Colors, Reveals Enhanced Natural... ... 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 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 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 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 (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 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