Products

Good Night Solar System explores the Milky Way Galaxy, the Sun, the Moon, all of the planets, including Mercury, Venus, Earth, Mars, Jupiter, Satu...

This Keypad should only be purchased for use with the GTOCP1, GTOCP2 and GTOCP3 control boxes. This Keypad model will be supplied with the original...

This Keypad should only be purchased for use with the GTOCP4 and GTOCP5 control boxes with version P02-09 firmware or later. If you own a GTOCP1, ...

All GTO mounts(except the Mach2GTO) produced since 1998 can be easily upgraded!!! The GTOCP4 Upgrade and Installation Guide (PDF document) provide...

Arizona s top-selling 4x4 guidebook. 100 of the best 4x4 trails in Arizona. Completely redone 3rd edition is more fun than ever. Whether you are a ...

Hands-on space science projects help launch kids ages 8 to 11 into learning about fearless female astronauts who broke barriers across space and g...

Half pier compatible with Gitzo Systemetic 3 Series, 4 Series and Xiletu L404C tripods. Mounts and half pier are tightened with two M8 knob bolts, ...

Author: Robert Michael PylePaperback: 280 pagesThis essential handbook covers where to find butterflies; how to observe and photograph them; their ...

Celestron's HD Pro Wedge is designed to support our fork mounted Schmidt Cassegrain Telescopes up to 11". The HD Pro provides a heavy duty, stable ...

Authors: Bruce GrubbsPaperback: 368 pages, 3rd Ed.Lace up your boots and sample 120 of the finest trails in Arizona. Hike the Boucher-Hermit Trails...

Author: Erik MolvarPaperback: 311 pagesSouthern Arizona offers unlimited opportunities for backcountry exploration. This second edition of Hiking A...

Additonal 1.25" Reflector Mirror for Advanced CT Laser Collimator Features: Precision retro reflector mirror for Advanced CT Laser Collimtor - Dou...

Self-Centering Adapter (SCA) Provides Repeatable InstallationThe HoTech laser collimator separates itself from all other laser collimators with its...

Self-Centering Adapter (SCA) Provides Repeatable InstallationThe HoTech laser collimator separates itself from all other laser collimators with its...

New! 14" HyperStar Laser Collimator Package includes:1 x Advanced CT Laser Collimator1 x 14" HyperStar reflector mirror adapter1 x High accuracy du...

Self-Centering Adapter (SCA) Provides Repeatable InstallationThe HoTech laser collimator separates itself from all other laser collimators with its...

Self-Centering Adapter (SCA) Provides Repeatable InstallationThe HoTech laser collimator separates itself from all other laser collimators with its...

FeaturePackage includes:1 x Advanced CT Laser Collimator1 x HyperStar reflector mirror adapter for 9.25" and 11" model1 x High accuracy dual-sided ...

Innovation brings Affortable and Portable Collimation into RealitySince the invention of the Cassegrain Telescope in 1672 by the French sculptor Si...

Innovation brings Affortable and Portable Collimation into RealitySince the invention of the Cassegrain Telescope in 1672 by the French sculptor Si...

Collimates 8" Schmidt-Cassegrain Telescopes with HyperStar Lens installed. Package Includes: Advanced CT Laser Collimator 8" HyperStar Reflector M...

High Quality Optics Designed for Refractor Telescopes This field flattener is fully multi-coated on two-element lens allowing the most efficient li...

Announcing the Self-Centering Camera T-Adapter for Astrophotographers.The Self-Centering Adapter (SCA) mechanism provides repeatable and reliable c...

2" SCA T-Adapter center and square loads perfectly in your visual back and provides a secure adaption for the best imaging result Announcing the S...