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  Eyepieces, &Acc
  Star Diagonals
  Solar Observation & Imaging
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Digital, Photography
Baader Mounting Accessories
Eyepiece Adapters, Rings, Etc

Optics Care, Collimation Aids

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About Us




- Unique Astronomical Accessories -

Welcome to Alpine Astronomical, where you will find a growing selection of truly unique high-quality astronomical equipment and accessories.    Whether your interest is visual observation or imaging of the Planets, Deep Sky, or Sun - Alpine Astronomical is committed to providing the ultimate tools.  To fulfill this goal we have partnered with some of the world's premier Astronomical equipment manufacturers.  


Solar Spectrum      

We are pleased to offer many high-quality products from Baader Planetarium, and think you will find them as innovative and useful as we have.  Most of these accessories have been designed as a system, enabling you to mix and match to meet your specific needs.  As a fully authorized Baader Planetarium distributor for these products, we are able to offer expert sales and support for North America.  We welcome Dealer inquiries.


We also supply a wide range of filters for studying the Sun.   We carry the full line of professional

Solar Spectrum  Ultra-Narrowband H-Alpha filters and Baader White Light and Calcium filters.


Alpine Astronomical offers the full range of 10Micron HPS GoTo Mountings and Accessories. through our sister website -  These innovative and ultra-precision absolute endoder GoTo mountings are truly in a class by themselves.  




10Micron GM4000,

with PlaneWave CDK20, 20" Astrograph

10Micron GM1000HPS





Through April 15




3/21/20 Update: New Baader Star Diagonal Technical Brochure


Baader makes a huge range of Star Diagonals and accessories. Their new technical brochure thoroughly explains all of their diagonals and related accessories, which will help you to find the perfect match for your needs.






11/07/19 Update: AstroMounts Launches!




We are happy to announce the creation of our new sister website -  AstroMounts is dedicated to showcasing high-precision mountings and accessories from 10Micron and Baader Planetarium.




Alpine Astronomical and AstroMounts at AIC



Come see us at AIC in San Jose, November 15-16!




8/28/19 Update: Baader Flip Mirror II Star Diagonal


We have received our first batch of the new Baader Flip Mirror II Star Diagonals.  This exciting new product is the 'swiss army knife' of star diagonals.  With 3 adjustable configurable output ports and high quality flip mirror the BFM-II becomes the heart of your equipment system.  Its multitude of adaptations give the imager and visual astronomer practically limiteless ways to couple and operate multiple instruments, cameras, guiders, off axis guider, eyepieces and binoviewers. 





7/24/19 Update: Baader Steeldrive II Motor Focuser for Diamond Steeltrack Focusers (and other focusers)


The new version of the Baader Steeldrive II is a complete platform which can be used to precisely control focuser position from either the new control unit or via PC.  Thermocompensation makes use of up to two digital temperature sensors.  A contactless hall effect sensor gives precise and repeatable absolute homing. 



















Baader Planetarium has taken astronomical filtration to new levels.  Baader's innovative new designs and features, together with the very latest thin film coating technologies, result in outstanding performance, efficiency, and image quality.   Baader filters are unique, in that they utilize true optically polished flat substrates.  Ultra-thin precision cells deliver the maximum clear aperture and minimize vignetting.   Ionbeam hardened coatings ensure your filter will withstand real-world use and repeated cleaning - they are tough enough to survive boiling water! 


Whether for visual observation of planets and deep sky, or imaging with CCD/DigiCam/Webcam, Baader filters stand out from the crowd.


 Planetary and Contrast Enhancement

  • Baader Semi-APO Filter,  Baader's latest filter combines properties of the renowned Fringe Killer and the Moon & Skyglow into a single filter.   The result is the most neutral and violet fringe-free views obtainable with achromatic telescopes.  The unique properties of the Semi-APO filter significantly enhances views of Mars with ALL telescopes (reflectors and all refractors), while maintaining a very natural appearance (almost no color cast).

  • Baader Fringe Killer, Featured in Sky & Telescope April 2004 Review! The World's most advanced "minus violet" filter is here. Greatly reduces the de-focused violet fringe in achromats, while preserving the natural color balance with minimal reduction in brightness!  Incorporates Baader's legendary UV/IR filtration to also make this the ultimate CCD and Webcam imaging filter for achromats. 

  • Baader Contrast-Booster, Featured in Sky & Telescope April 2004 Review! More than just a minus violet filter.  Significantly boosts lunar and planetary contrasts, cuts skyglow, and totally eliminates the de-focused blue halo from achromats. Outstanding filter for Mars, with all telescopes! 

  • Baader Moon & Skyglow Filter, Featured in Sky & Telescope April 2004 Review!  Innovative Neodymium filter, enhances both planetary and deep sky contrasts by reducing skyglow caused by artificial lighting and background glow from Moonlight.  Also acts as an RGB intensifier for boosting color contrasts of many planetary features. Ionbeam hardened multicoatings and very high transmission for maximum durability and image brightness.

  • Baader Premium Colored Filters, Now in 2" Size!!  World's finest colored filters for lunar and planetary observing.  Multi-coatings, fineoptical polish and ideal spectral characteristics make these 6 filters the perfect tool for serious planetary observation and imaging. Available in both 1" and 2" Sizes.

  • Baader Solar Continuum Filter, Though intended primarily for Solar Observation, the 540nm Solar Continuum filter also works as the perfect narrowband green filter for star testing of refractors.


Deep Sky Filters

  • Baader UHC-S Nebula Filter  A new generation of premium nebula filter.  The UHC-S delivers a darker sky and improved contrast over typical broadband 'Deep Sky Filters', but without sacrificing all the stars like other 'UHC' filters.  Extreme efficiency makes this filter great for smaller scopes as well as the giants.  Ideal for imaging, too (with >99% transmission of H-Alpha).

  • Baader O-III Visual Nebula Filter  Outstanding views of many emission and planetary  nebula.  The Baader O-III delivers maximum contrast and image sharpness due to it's narrow, high efficiency bandpass and high quality single substrate.


Imaging Filters

  • Baader UV-IR-Cut Filter, The ultimate UV and Infrared blocker, for Digital Camera, CCD, and Webcam (Toucam!) imaging (also useful for protecting expensive H-alpha filters).  Many of the very best Planetary images from around the world have been taken using this filter. Sharp cutoff and 98% transmission! Now in 36mm Round, 50.8mm Round, 50mm Square, and 65mm Square.

  • Baader UV-IR-Cut DSLR Filters, NEW!! Convert your Canon digital SLR to an astro-camera.  Baader's new ACF filters are designed to replace your camera's stock 'hot mirror' with a special UV/IR filter that retains maximum transmission in H-Alpha.  Also boosts resolution (due to elimination of the moire filter in the stock Canon filter).  Filters are available to fit most models of Canon DSLRs (sorry, no filters for Nikon at this time).

  • Baader IR-Pass Filter, The secret behind some of the world's best amateur planetary images.  Reduces the effects of atmospheric turbulence on planetary images by allowing you to capture the luminance image at longer wavelengths (starting at 670nm).

  • Baader U-Filter (UV, Venus)  Filter,   Special 350nm Bandpass Filter enables imaging of cloud structures on Venus!  Also ideal for terrestrial UV Imaging. 1.25" and 2" Sizes.

  • Baader H-Alpha 35nm Bandpass Filters,  The wider bandpass makes this the perfect H-Alpha filter for deep sky imagers with Digital SLRs and interline CCDs.  Extremely high transmission, sharp cutoff, and superb optical quality. 1.25/2/RD50/SQ65

  • Baader Narrowband CCD Bandpass Filters,  Now in H-Alpha, H-Beta, O-III and S-II.  Baader's new narrowband CCD filters deliver outstanding transmissions.  Available in  narrow 7-8.5nm bandpasses and also 3.5nm H-alpha to totally block all light pollution and longer wavelengths, delivering the highest contrast CCD images possible at these emission lines.  Baader's world-leading optical quality and coating consistency ensures maximum contrast with no loss of image sharpness.  Available in 1.25" and 2" Mounted, 36mm Round, 50.8mm Round, 50mm Square, and 65mm Square (unmounted).

  • Baader f/2 Highspeed Narrowband Filters,  give imagers new tools to record the maximum contrast even with the latest high-speed imaging systems. Available in H-Alpha, H-Beta, O-III and S-II.

  • Baader LRGBC Filters,  After an extensive development process, Baader Planetarium is at last able to introduce the next evolution of the RGB filter.  Through the use of the very latest coating equipment and coating design technology, the Baader LRGBC filters are able to produce improved color separation, top image quality, extreme transmissions, and freedom from the reflections common in other premium RGB filters.  Available in 1.25" and 2" Mounted, 36mm Round, 50.8mm Round, 50mm Square, and 65mm Square (unmounted).





 Eyepieces, Accessories


  • Baader Morpheus 76 Eyepieces, Spring Sale!!  World-leading performance and features. Featuring 76degree sharp-to-the-edge apparent fields and long eye-relief, Morpheus bring a new level of performance, features, and value to the field.  Available in 4.5/6/9/12.5/14/17.5mm focal lengths

  • Baader Hyperion 68 Modular Eyepieces, Excellent medium wide field performance and unique features, at a low price point.  Baader proprietary multicoatings, optical quality, and internal baffling deliver superb high-contrast widefield views.  Innovative optical and mechanical features enable variable focal lengths and use as a multifunctional projection eyepiece for imaging.  5,8,10,13,17,21,24mm focal lengths, each with dual 1"/2" barrels.   

  • Baader Hyperion-Aspheric 72 Modular Eyepieces A technological first - the Baader Hyperion-Aspherics incorporate aspheric surfaces to deliver outstanding performance.  Their extremely comfortable view and flat 72 wide field is packed into a relatively compact size - at a very reasonable price.  Threaded for direct camera attach for imaging and includes 1" barrel in addition to the 2" Barrel.

  • Baader Hyperion 8-24mm Clickstop Zoom Eyepiece,  Extra-Wide Field, Superb optical performance, quality, and Innovative features.  Advanced Baader proprietary multicoatings.

  • Baader Hyperion  Zoom Barlow,   Optically Matched 2.25X Barlow quickly converts all Baader Hyperion Clickstop Zoom Eyepieces into a 3.5-10.5mm Clickstop Zoom.  Anastigmatic Flatfield Triplet design works superbly as a general purpose Modula Barlow for all eyepieces and projection imaging uses.



  • Baader Classic Eyepieces and Classic Q-Turret Eyepiece Sets,  Baader Planetarium set out to  produce a high-performance eyepiece, without breaking the bank.  The result, eyepieces with value and performance that matches much more expensive 'planetary eyepieces'.   Super-low reflection HT multi-coatings, superb optical polish and straightforward mechanics result in maximum contrast, resolution, and light throughput. 6,10,18,32mm focal lengths, 1" Barrel.  Matching 2.25X Q-Barlow and 4-position Q-Turret create the ideal set for a large range of 8 focal lengths, instantly available with a twist of the turret

  • Baader Zeiss Abbe 2X Barlow, The Zeiss Abbe Barlow is back!! Baader Planetarium has persuaded Zeiss to produce more of their legendary Abbe barlow and incorporated the superb Clicklock eyepiece clamp.  The result is the world's finest barlow.  New Production Run for 2017!!

  • VIP 2X Modular Barlow,  Flat field, large aperture, air-spaced Barlow.  The perfect compliment to Baader Genuine Orthos.  Modular T-2 assembly and dual 1"/2" design enables visual and imaging flexibility.

  • Blazed Grating Spectroscope/Spectrograph,  The original eyepiece spectroscope.  Utilizes Baader's proprietary blazed transmission grating to deliver extra-bright spectra (up to 82% first order transmission!, 30% brighter than other available eyepiece spectrographs).  Designed for both visual study and imaging.  Perfect for educators.

  • Winged Rubber Eyecups, Three sizes to fit most 1" eyepieces .  Perfect for binoviewing and replacement of inferior 360degree eyecups.














  • Baader Diamond Steeltrack Focusers,  Baader Planetarium brings their renowned quality and innovation to the crayford focuser.   Baader's innovative diamond-geared drive system delivers the smooth totally backlash-free action of a friction drive with the positive non-slip high load capacity of a rack and pinion.  10:1 reduction and oversized knobs enable finger-touch fine focusing.  Additional improvements in the bearing-guide system help to take the Baader Diamond Steeltracks (BDS) far beyond all other crayford-type focusers. Available in 3 sizes; 2" Newtonian Low-Profile, 2" SCT (5-14"), and 2" Refractor.   

  • SteelDrive Motorized Focusing System available for precise and repeatable thermo-compensated automated focusing (handcontroller included for manual operation). 





  • Baader Maxbright-Binocular Viewer, Baader Binoviewer quality and features in a new low-priced version!   Not just another 'Chinese Clone' variant.  Top optical quality, collimation, and T-2 Modularity set the Maxbright apart from the crowd.   Includes Baader's renowned Glasspath Compensator.  Numerous Accessories enable optimal adaptation to any telescope.  NEW VERSION Maxbright II due in Spring 2020

  • 2" Newtonian 1.7X Coma-Correcting Glasspath Compensator, Greatly reduces back-focus needed for Binoviewing with Newtonians.  Advanced optical design corrects coma, prism color errors, and spherical aberration in fast systems, without vignetting (even with Baader's 29mm Mark V Giant Binoviewer).  Outstanding coatings and stray light baffling.  



Star Diagonals


  • Precision T-2 Amici Diagonal, at last, a super-high optical quality correct image star diagonal in an oversized 1"+  format. T-2 Modularity.

  • T2 Maxbright 32mm Prism Star Diagonal,  Optimized for compact size and value, esp for binoviewer use,  the smaller brother to the T-2 Deluxe Prism diagonal delivers top performance and rigidity with its all-metal machined housing.  Two configurations:  Prism Body only and complte 1.25" diagonal package.

  • T-2 Deluxe Prism Star Diagonal, world's finest right angle prism star diagonal.  Oversized Zeiss-Spec Prism, T-2 Modularity.

  • T-2 Maxbright Mirror Diagonal,  the ultimate in high reflectivity diagonals, in a 1"+ oversized form-factor.  The low-scatter 99% all-dielectric coatings and proprietary coating process results in the flattest, highest performance diagonal available.  T-2 Modularity makes this diagonal fully adaptable for any need.

  • BBHS T-2 Mirror Diagonal, NEW  Baader's new Broadband Hardcoated Silver mirror diagonal delivers the brightness and contrast, brightness and low-scatter of a prism diagonal with improved color fidelity. Zero Expansion Sitall Substrate.  Now available in the modular T-2 format.

  • Baader 2" Clicklock Mirror Diagonal, Big brother to the T-2 Maxbright.  New 2" Clicklock Eyepiece Holder for ultra-fast secure clamping!  Low scatter all-dielectric coated, 1/10 wave mirror.  Extra Large-Aperture, Modular housing, and even a low-profile attachment for SCTs. (Permits full access for Nexstar 8/8i users).

  • BBHS 2" Clicklock Mirror Diagonal, NEW  Baader's new Broadband Hardcoated Silver mirror diagonal delivers the brightness and contrast, brightness and low-scatter of a prism diagonal with improved color fidelity.  Zero Expansion Sitall Substrate.  Includes 2" Clicklock Eyepiece Holder.

  • Baader 2" Clicklock Prism Diagonal, NEW  Back after a long absence.  The newest version of Baader's famous 2" Zeiss-spec prism diagonal is now housed in a more compact housing, complete with a 2" Clicklock Eyepiece Holder.


Solar Observation                                                            



  • Baader Cool-Ceramic Safety Herschel Prism, Sky & Telescope Hot New Product for 2006! Baader's  New 2" Cool-Ceramc Safety Herschel Prism delivers the finest white-light solar views obtainable.  New version is completely sealed and incorporates a unique ceramic solar finder.  Views are notably superior in resolution and contrast to even the very finest and most expensive glass objective solar filters and films. Brand New 3rd Generation Version, also includes Solar Continuum Filter.

  • Baader Solar Filters (BSF), with AstroSolar Safety Film,  At last the world's finest objective solar filter material is available as a complete range of mounted Baader Solar Filters.  Their innovative design and construction enables each filter to fit a wide range of instruments - From High-End Telescopes, to Spotting Scopes, Cameral Lenses, and even special versions to fit Binoculars.

  • Baader AstroSolar Safety Film,  delivers white light views of the Sun that are unmatched by any other objective solar filter or material (Glass or Mylar) - at an affordable cost for telescopes of all sizes.

  • Baader Calcium K-Line Filter,  Unique double-stacked hard coated filter, centered at 395nm, allows imaging of the Sun at the CaK emission lines, for a tiny fraction of the cost of dedicated CaK telescopes!  Works with all telescopes (Refractor, SCT, Newtonians).  Great for imaging Venus Cloud Features!

  • Baader Solar Continuum Filter, Unique filter, designed to transmit a specific 540nm region to enhance granulation and penumbral contrast for both visual and imaging.   Reduces effects of atmospheric turbulence.  Especially good for achromatic refractors.  Note: Use of a primary solar filter is also required (ie Herschel Wedge, Baader Solar Filter, or AstroSolar film).

  • Solar Spectrum H-Alpha Filters Professional spec. large-aperture narrowband filter systems for H-Alpha.  Delivers amazing high resolution and high contrast views of solar disk  features and prominences.   At  reasonable prices.

  • Baader H-Alpha Accessories,  Cool-ERF filters from 70 to 180mm,  New 2X and 4X Telecentric Lens Systems utilizing the latest H-Alpha optimized designs.




Optical Accessories


  • Baader 2" MPCC Mk III Multi Purpose Coma Corrector, Optimized Wide-Field Design to correct Coma in fast (f/3.5-f/6) Newtonians.  Flexible design for numerous  imaging and visual configurations, no magnification increase! New Optical Design, Larger 44mm Clear Aperture.

  • Baader RCC-I Coma Corrector, Rowe Coma Corrector, Triplet Design to correct Coma in fast (f/3.5-f/6) Imaging Newtonians.  Extra Long Back-Focus to permit use of guiders, filter wheels, adaptive optics.  No magnification increase! 

  • Baader RCC Off-Axis Guider, Radial/Axial Off-Axis Guider matched to work with RCC Coma Corrector and Digital SLRs.

  • Alan Gee Mark II Telecompressor, brings a new level of quality and photo-visual flexibility to Schmidt-Cassegrain users - and  opens up a new world of wide field BinoViewing!

  • Baader TurboFilm,  serves as a precision transparent (clear) optical window to seal telescopes and optical systems..  TurboFilm is the highly transparent  base material used for the renowned Baader AstroSolar.  This material has amazing optical quality, which preserves the incoming wavefront.   Great as a protective front filter, or as an optical window for sealing open systems and reducing tube currents  (Cassegrains/Mewlons and Newtonians).  Also useful in many  industrial and research applications.


Digital, Photography   


  • Baader Micro Stage II Clickstop Digital Camera Adapter, Our most versatile  Digital Camera Adapter - with a new Twist.  The camera may be pivoted away from the eyepiece at any time for framing and focus, then returned to position with a 'Click'.  Rigidly and accurately attach any digital camera to any 1.25" - 2" eyepiece for projection imaging.   Outstanding Value and Convenience.  Even fits binoculars and spotting scopes.

  • OPFA System, an all-threaded adjustable modular afocal and eyepiece projection adapter system for Digital Cameras and Webcams.

  • Digital T-Rings, wide selection of sizes that allow you to use many  popular digital cameras  for afocal projection imaging.

  • HYPERION Digital T-Rings, wide selection of sizes that allow you to use many  popular digital cameras  for afocal projection imaging.

  • Protective Wide T-Ring System for Canon EOS, Baader's highly optimized and oversized T-ring system for Canon EOS.  Allows installation of Baader 2" mounted and un-mounted filters within the T-ring for complete protection of the camera sensor optics. Largest possible clear aperture (47.3mm).  Improved bayonet fit & tolerancing to ensure zero image shift due to lateral play and wobble inherent in standard T-rings.  Versions available with pre-mounted Clear/UV-IRCut/UHCS/H-a filters. 

  • UFC (Universal Filter Changer) System.   This large system of modular parts enables you to quickly and precisely insert and change filters in-between practically any telescope and camera.  You can even use it to quickly mount filters ahead of camera lenses, or for visual uses ahead of an eyepiece holder.





  • Vario Finder, Multi-Purpose 10x60 Finder/Guider/Spotting scope.   High optical quality and extremely flexible/modular design.

  • Sky Surfer III, large aperture, clear window (high transmission) and integral dewshield set this affordable red-dot finder apart.

  • Sky Surfer V, rugged sealed all-metal red-dot finder.  Now with Black Finish and Now Includes Baader's new Aluminum Quick-Release Dovetail Mounting System!


Mounting Accessories


  • Baader NexStar Bracket, Featured in Sky & Telescope Feb 2003 New Products Showcase!  Convert your NexStar 60/80/114/130GT or Orion StarSeeker mount into a full-featured Go To Platform, perfect for any small telescope.

  • Modular Guidescope Rings, offer extreme rigidity and a host of unique features.

  • Baader Dovetail Bars, NEW!! Engineered to be Extremely Rigid, yet light. Mark III - 470mm (18.5") long, pre-drilled for adapting C8/9/11 and other large scopes onto Synta/Orion EQ and Vixen mounts.  Mark IV for mounting onto Astrophysics Dove08 and Zeiss Mountings.  More info coming soon.




Eyepiece Adapters, Rings, Etc

     (Baader ASTRO T-2 System) New adapters added recently

  • Reducers, how about a precision .965" reducer with 1 filter threads?  Or a multi-function 2" reducer with bronze clamp ring?

  • Eyepiece Holders, Nosepieces, quality accessories for standard 1 or 2" use.  Non-Marr Clamping, precision machining and finish.  World's finest Clamping Eyepiece Holders (Click lock System for both 2" and 1)

  • T-2 Quick Changer, nifty dovetail coupling system.

  • Extension Tubes, rigid T-2 and M48 couplers for setting component spacing.  Baader VarLock Variable Length Extension Tubes.

  • Adapter Rings, adapt T-2 accessories to any scope.  NEW !! Takahashi converter



Optics Care, Collimation Aids


  • Laser-Colli, unique laser collimator with viewable alignment reticle, works for SCTs too!



  • Optical Wonder Fluid, outstanding Baader Planetarium lo-residue optical cleaner.  At last, get even stubborn multi-coated optics pristine.   Special ingredients prevent fungus and micro-organism growth! temporarily unavailable

  • Optical Wonder Cloth, Super-Microfiber cleaning cloth.  Conveniently cleans most residues from eyepieces, without a scratch, and ideal when teamed with Optical Wonder Fluid.  Superior to generic camera store cloths.

  • Desiccant, silica gel beads, perfect for protecting your scope or optical accessories from damaging moisture.


  • Rocket Air Blaster, delivers a long-lasting focussed jet of air to loosen even the toughest particles.  It's the highest-powered air blower we've ever used.


   Baader Observatory Domes


  • Baader Planetarium also produces the world's finest professional observatory domes.  Their domes are in operation throughout the world, in some of the harshest and most demanding environments from the North Pole to the South Pole.  Please contact us for further information.

Here's a link to an amazing video showing the helicopter installation of a Baader Planetarium 8.5mm Dome on the top of Mt. Wendelstein in the Bavarian Alps:

Here's a new video showing the helicopter installation of a Baader Planetarium 4.2mm Dome on the top of Mt. Zugspitze - the third dome on this mountain peak, the highest point in Germany at 2964M (9720 ft).

Link to images of Baader's South Pole installations:





This page last updated 03/21/20

Last Site Update 03/21/20

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