Under $500

Description Dual plug (DB9 FTDI chipset and USB 2.0 Mini B) works with PMC-Eight OPENGoTo systems, allowing ASCOM communications between a compute...

We normally think of galaxies as some of the largest, brightest structures in the universe – but that isn’t always true. It is star formation t...

Ultra-diffuse galaxies are generally quenched dwarf galaxies with no gas reservoirs, they are therefore unable to form new stars; as a result, ...

Features Flashlight mode has a low beam option that illuminates up to 40 meters and a high beam option that reaches up to 100 meters Floodlight m...

The universe has always been mysterious and strange to us, but in fact it may be stranger than we can ever fathom. In this episode of How Do You...

Features Wireless rain gauge with digital display 9-day precipitation history and rain alarm Time (12 / 24h) Date with language selection for the...

Features Detect coins, jewelry and other metal objects up to 6 inches below the surface LCD display and audio tones alert searchers to presence ...

The L-eXtreme is a two-band filter and the ideal choice for strong suppression of light pollution. It enables astrophotos of objects with narrow-ba...

Features Dark-Sky filter Contrast increase in aurora & deep-sky photography Reduction of stray light from street lights, for example Wide-ang...

In the second part of Dr. Barth's discussion on dark matter, he touches on why did galaxies form, the missing matter problem, and the Great Attr...

In this episode, Dr. Barth discusses the the difference between persuading someone to accept your opinion in an argument and arguing from eviden...

Features High quality Explore Scientific O-III filter Let only the oxygen emission lines "through" Absorbs all other emission lines Absorbs almo...

Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

Features High quality Explore Scientific O-III filter Let only the oxygen emission lines "through" Absorbs all other emission lines Absorbs almo...

Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

Features High quality Explore Scientific S-II filter Absorbs all other emission lines Absorbs almost all of the artificial light Passband bandwid...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

Features High quality Explore Scientific H-Alpha filter Lets only the emission lines of hydrogen "through" Absorbs almost all of the artificial l...

The creation of Earth's Moon is an age old question. There are pre-Apollo mission theories, of which three of the most popular ones will be d...

Features Trekking poles provide stability on uncertain terrains, enhance calorie burn and relieve strain by encouraging good posture while walkin...

It's estimated that we will colonize Mars by 2050. The challenges to make it happen are daunting.  Dr. Barth touches on some of the problems tha...

Features Tuya® IoT ready that works with Tuya® Smart & Smart Life Apps via Wi-Fi Able to trigger other Tuya® compatible IoT devices Multi-cha...

Features Sleek profile with top-class metallic charcoal grey finish Slim design with 4 standing angles, ideal for Desktop, bedside or wall Splend...

Features HD Camera Waterproof Case Flat Adhesive Mounts Handle Bar/Pole Mount Frame Housing Mount Velcro Straps Long Thumb Screw Quick Release Bu...

Features 4K HD Camera Waterproof Case Flat Adhesive Mounts Handle Bar/Pole Mount Frame Housing Mount Straps Long Thumb Screw Quick Release Buckle...

Description Around the World or Around the Block - Bresser Everest Binoculars are the Perfect Companion! Offering an ideal combination of superior...

Dr. Daniel Barth returns with the 33rd episode of 'How Do You KNOW?' to discuss the Three Ring Theory that explains the formation of our solar s...

Features German silent movement and components, high sensitivity and precision Radio-controlled time via WWVB in the United States, Canada and Me...

Features Combination of fully multi-coated lenses and superior Bak-4 prisms creates images with excellent contrast and clarity 42mm aperture has ...

Features Combination of fully multi-coated lenses and superior Bak-4 prisms creates images with excellent contrast and clarity 42mm aperture has ...

Features Combination of fully multi-coated lenses and superior Bak-4 prisms generate images rich in contrast Combination of fully multi-coated le...

Features Compact size keeps the binocular lightweight for grab-and-go adventures and extended observing 8x magnification provides excellent detai...

Features Compact size keeps the binocular lightweight for grab-and-go adventures and extended observing Combination of fully multi-coated lenses ...

Features 8x Magnification ED Glass Waterproof Fogproof and Nitrogen Purged 372ft field of view at 1000 yards Case, strap, lens covers and cleanin...

Features 10x Magnification ED Glass Waterproof Fogproof and Nitrogen Purged 319ft field of view at 1000 yards Case, strap, lens covers and cleani...

Features 8x Magnification ED Glass Waterproof Fogproof and Nitrogen Purged 335ft field of view at 1000 yards Case, strap, lens covers and cleanin...

Dr. Daniel Barth gives us an overview of and will answer your questions about the James Webb Space Telescope in this 34th Episode of How Do You ...

Features Automatic time setting (CET) via radio signal Manually Time offset adjustable for other time zones Symbolic weather forecast for the nex...

Features 4K HD Camera Waterproof Case Tripod Floating Handle Flat Adhesive Mounts Handle Bar/Pole Mount Frame Housing Mount Straps Long Thumb Scr...

Dr. Daniel Barth gives us an overview of and will answer your questions about Lagrange Points in this 35th Episode of How Do You KNOW? https://e...

Dr. Daniel Barth gives us an overview of and will answer your questions about what happens When Asteroids Strike in this 36th Episode of How Do ...

What happens when the sun releases energy to create prominences, flares, mass ejections, and tsunamis, and how can those events affect us on ...

Description Using this accessory plate, you can use telescope and camera side by side By sliding this accessory plate into your standard Vixen Do...

Description Finder Bracket to facilitate Optical axis adjustment Short bracket for Vixen Finder Scope. Use with item #2654, finder bracket shoe, ...

Description Dovetail Plate for Telescopes and Field Scope Use to balance your telescope with Vixen Tube Rings or third party rings. Other devices...