Products

ED objective lenses provide superior images virtually free of chromatic aberration with accurate color reproduction, increased resolution and cont...

ED objective lenses provide superior images virtually free of chromatic aberration with accurate color reproduction, increased resolution and con...

Our 1-1/4" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specificall...

Our 2" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically th...

  65 mm Refractor Spotting Scope Multi-Coated optics 45° viewing angle 18-55x zoom eyepiece Sight tube for quick targeting Waterproof Soft carryin...

  80 mm Refractor Spotting Scope Multi-Coated optics 45° viewing angle 20-60x zoom eyepiece Sight tube for quick targeting Waterproof Soft carryin...

80 mm Refractor Spotting Scope Multi-Coated optics Straight through viewing angle 20-60x zoom eyepiece Sight tube for quick targeting Waterproof S...

10mm parfocal Ultra Flat Field eyepiece designed for 1.25” focusers Incredibly crisp views from center to edge of field Fully multi-coated, 5-ele...

15mm parfocal Ultra Flat Field eyepiece designed for 1.25” focusers Incredibly crisp views from center to edge of field Fully multi-coated, 8-ele...

18mm parfocal Ultra Flat Field eyepiece designed for 1.25” focusers Incredibly crisp views from center to edge of field Fully multi-coated, 8-ele...

24mm Ultra Flat Field eyepiece designed for 1.25” focusers Incredibly crisp views from center to edge of field Fully multi-coated, 8-element lens...

30mm parfocal Ultra Flat Field eyepiece designed for 2” focusers Incredibly crisp views from center to edge of field Fully multi-coated, 9-elemen...

Ultimate Stickers Books make learning fun. Each Ultimate Sticker Book presents an array of colorful, photographic stickers of baby animals or dinos...

Unrivaled in its breadth, Universe explores every aspect of the cosmos, from the big bang to planets in our solar system and beyond. Detailed profi...

Powerful 20x optical system for an image that is close-up to the action Large 50mm objective lenses with tremendous light gathering capability Hig...

High-quality everyday binoculars that are easy to take along on all life’s adventures Multi-coated optics increase light transmission for brighter...

This cable is used to convert a serial cable into a cable that is compatible with standard USB ports. Recommended for use with our RS-232 cable (93...

Used ZWO EFW 5x2" filter wheel.  First generation model.  Excellent condition. Includes original adapters, screws, USB cable and box.

Used Baader Morpheus 17.5mm eyepiece.  Like new.  Includes original box, caps, eyeguard and soft case.

Used Baader Morpheus 4.5mm eyepiece.  Like new.  Includes original box, caps, eyeguard and soft case.

Used Baader Morpheus 6.5mm eyepiece.  Like new.  Includes original box, caps, eyeguard and soft case.

Used Celestron Luminos 31mm eyepiece.  Very good condition.  Includes original caps, no box.

Used Explore Scientific 11mm 82-Degree eyepiece.  Excellent condition.  Includes original caps, no box.

Used Explore Scientific 14mm 100-Degree eyepiece.  Excellent condition.  Includes original caps, no box.

Used HyperStar 9.25 v3.  Excellent condition.  Includes adapter for 17.5mm backfocus M42 camera (ZWO, etc.)

Used HyperStar C11 v3.  Excellent condition.  Includes adapter for 17.5mm backfocus M42 camera (ZWO, etc).  Can be used on EdgeHD scope with option...

Used HyperStar C8 v4 with Filter Slider.  Excellent condition.  Includes adapter for ZWO 17.5mm backfocus M42 camera.

Used Tele Vue 10mm Delos eyepiece.  Like new.  Includes original box and caps.

Used 1.25" Tele Vue 3x Barlow in excellent condition.  Original box is a bit scuffed but Barlow looks great.  Thumb screw may not be the original b...

Used ZWO ASI183MM Pro monochrome camera.  Excellent condition.  Includes all original cables, adapters, case and box.

Used ZWO ASI220MM Mini guide camera.  Like new.  Includes all original cables, adapters and box.

Used ZWO OAG-L off-axis guider.  Excellent condition.

Used Astronomik CLS CCD filter.  T-Mount (M42 threads), not 2".  Excellent condition.

Used Astronomik H-alpha filter, 12nm bandpass.  2" Mounted (M48 thread).  Excellent condition.

Used Astronomik L-RGB Type 2c Filters.  2" Mounted (M48 thread).  Excellent condition.

Used Astronomik OIII filter, 12nm bandpass.  2" Mounted (M48 thread).  Excellent condition.

Used Atik 314L color CCD camera.  1.4 glorious megapixels of big 6.45-micron pixels!

Used Atik 420 color CCD camera.  4.4um pixels, 9mm sensor diagonal.

Used Atik 428EX color CCD camera.

Used Atik 428EX monochrome CCD camera.  4.54um pixels, 11mm sensor diagonal, 2.8 megapixels.

Used Atik 460EX color CCD camera.  4.54um pixels, 16mm sensor diagonal.  Includes 1.25" nosepiece, USB mini cable, DC power supply, original box.

Used Atik 460EX color CCD camera.  4.54um pixels, 16mm sensor diagonal 6 megapixels,.  Includes 1.25" nosepiece, original box.

Used Edmund Scientific RKE 21.5mm Eyepiece.  Good condition overall, some marks, optics are very good.

Used Orion (Vixen) 8mm LVW Eyepiece, wide field, long eye relief.  Fair condition.

Remember in 2005 when you could get a camera with big pixels?  380 kilopixels of 9-micron light buckets, baby! Grab this used SBIG ST-402ME and tak...

Used University 12mm Konig Eyepiece.  Minor marks on 1.25" barrel, main body is very good and optics are excellent.

Used University 13mm Wide View Plossl Eyepiece.  Minor marks on 1.25" barrel, main body is good and optics are excellent.