Over $25

Features Learn how metal detectors work Build a handheld metal detector with adjustable sensitivity Discover how security checkpoints function by...

Features Learn simple scientific principles as you tackle 125 different circuitry challenges Design a maze and up the difficulty with a few bends...

Features Learn the basics of circuitry as you build your own boxing robots Have a fun bot-battle with family and friends Individual scoreboards a...

Description   This model does not come with the adapters that allow for a direct screw-on connection to a camera. It can be used with a camera by ...

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

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

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 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...

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

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 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...

Description Observing with the ED152 Air-Spaced Triplet FCD1 Series Apochromatic Refractor in Carbon Fiber with genuine HOYA FCD1 ED Glass: Seriou...

"This is the ultimate portable system as far as I am concerned."-Jim Johnston Astrophotographer Features The iEXOS-100 is an astronomical GOTO sys...

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   For stable astrophotography Stable astrophotography can be available. Vixen's Weight Shaft Camera Bracket allows for the attachment...

Features Declination body acting as part of counterweight Retractable counterweight bar STAR BOOK ONE dual-axis controller Description The SX2 ...

Description It allows you to use an polar alignment scope PF-LII, polar alignment scope PF-L or SX polar axis scope for the POLARIE U. The polar s...

Features Travel camera mount for star photography Very compact and light, optimized for air travel Different tracking speeds Designed for time-la...

Description A wider field of view is more comfortable. Star images around the edge of the field of view have been improved and visibility has bee...