OSI

580 products

580 products
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Lumicon 1.25 inch thread-in telescope eyepiece extension tube, 1 inch push-back
Lumicon 1.25 Inch Thread-in Extension Tube - 1 Inch Eyepiece Push Back
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Farpoint Losmandy to Vixen Dovetail Assembly, Tall Version with Spacer Pucks view 1 of 3
Farpoint Losmandy to Vixen Dovetail Assembly, Tall Version with Spacer Pucks view 2 of 3
Farpoint D-to-V Dovetail Adapter Assembly, Tall (Losmandy to Vixen)
CXB 2-inch one shot color luminance filter with UV and IR cut, formerly Astrodon
CXB (formerly Astrodon) 2" One Shot Color Luminance Filter (UV / IR Cut)
JMI counterweight carrying caddy for German equatorial mounts, view 1 of 4
JMI counterweight carrying caddy for German equatorial mounts, back view
JMI Counterweight Carrying Caddy - German Equatorial
Farpoint Adjustable Tri-Bahtinov Mask for 7.5 to 10.5 inch OTAs, product view
Farpoint Tri-Bahtinov focus mask diffraction pattern illustrating telescope collimation analysis
Farpoint Adjustable Tri-Bahtinov Mask — 7.5" to 10.5" OTAs
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Lumicon 1.25 inch drop-in telescope eyepiece extension tube, 3 inch push-back
Lumicon 1.25 Inch Drop In Extension Tube - 3 Inch Eyepiece Push Back
Farpoint Bahtinov focus mask for Celestron 11-inch Classic SCT telescope
Farpoint Bahtinov focus mask product line image
Farpoint Bahtinov Focus Mask — Celestron 11" Classic
Farpoint 4-inch universal Vixen dovetail plate, view 1 of 3
Farpoint 4-inch universal Vixen dovetail plate, view 2 of 3
Farpoint 4 Inch Universal Dovetail Plate - Vixen
Farpoint knob and spring kit for Meade 16-inch LightBridge, complete hardware set
Farpoint knob and spring kit for Meade 16-inch LightBridge, knobs and springs laid out
Farpoint Knob/Spring Kit - Meade 16 Inch LightBridge
Farpoint Takahashi GSO Bracket Adapter, view 1 of 7
Farpoint Takahashi GSO Bracket Adapter, view 2 of 7
Farpoint Takahashi GSO Bracket Adapter
Farpoint Adjustable Tri-Bahtinov Mask for 9.5 to 12.5 inch OTAs, product view
Farpoint Tri-Bahtinov focus mask diffraction pattern illustrating telescope collimation analysis
Farpoint Adjustable Tri-Bahtinov Mask — 9.5" to 12.5" OTAs
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 1 of 4
JMI EV3-C Standard Event Horizon telescope focuser for Cassegrain, view 2 of 4
JMI EV3-C Standard Event Horizon Telescope Focuser - Cassegrain
Farpoint Adjustable Bahtinov Focus Mask — 9.5 to 12.5 inch OTAs (6862482112665)
Farpoint Bahtinov focus mask product line image
Farpoint Adjustable Bahtinov Focus Mask — 9.5" to 12.5" OTAs
JMI Tow Handle - for Wheeley Bars with 1/2" leveling screws and 5" wheels (6795828691097)
JMI Tow Handle for Wheeley Bars with 1/2 inch leveling screws and 5 inch wheels view 2 of 3
JMI Tow Handle - for Wheeley Bars with 1/2" leveling screws and 5" wheels
Farpoint Universal Binocular Mount 5 Pound Counterweight
Farpoint Universal Binocular Mount 5 Pound Counterweight
Farpoint Carey focus mask for 3.5-inch to 6.5-inch telescopes
Farpoint Carey focus mask grommet and screw mounting hardware
Farpoint Carey Focus Mask - 3.5 Inch to 6.5 Inch Telescopes
Farpoint 7-inch metric universal dovetail plate, product view
Farpoint 7 Inch Metric Universal Dovetail Plate
JMI Heavy-Duty Medium Size Universal Wheeley Bar Telescope Dolly product shot (6866238505113)
JMI Heavy-Duty Medium Size Universal Wheeley Bar with telescope mounted (6866238505113)
JMI Heavy-Duty "Shorty" Universal Wheeley Bar Telescope Dolly
Farpoint collimation spring kit for Meade 16-inch LightBridge, complete kit view
Farpoint collimation springs for Meade 16-inch LightBridge Dobsonian, close-up
Farpoint Collimation Spring Kit - Meade 16 Inch LightBridge
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JMI carrying case for Meade LX 10-inch, product shot
JMI carrying case for Meade LX 10-inch, front of case
JMI Telescope Carrying Case - Meade LX 10 Inch
Farpoint Tri-Bahtinov focus mask for the Celestron 11 inch Classic SCT
Farpoint Tri-Bahtinov focus mask diffraction pattern illustrating telescope collimation analysis
Farpoint Tri-Bahtinov Mask — Celestron 11" Classic
JMI EV2-N Event Horizon telescope focuser for Newtonian, view 1 of 7
JMI EV2-N Event Horizon telescope focuser for Newtonian, view 2 of 7
JMI EV2-N Event Horizon Telescope Focuser - Newtonian
Lumicon 2 inch drop-in telescope eyepiece extension tube, 1.5 inch push-back
Interior view of the Lumicon 2 inch drop-in 1.5 inch push-back extension tube
Lumicon 2 Inch Drop In Extension Tube - 1.5 Inch Eyepiece Push Back
Lumicon 7-piece nylon thumbscrew set, 10-32 x 3/4-inch size
Lumicon 7 Piece Nylon Thumbscrew Set - 10-32 x 3/4
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Lumicon 2-inch Neutral Density 50 filter for telescope eyepiece
Lumicon 2 Inch Neutral Density 50 Filter
Farpoint dovetail plate for Celestron 9.25-inch SCT, primary product view
Farpoint dovetail plate for Celestron 9.25-inch SCT, alternate view
Farpoint Dovetail Plate - Celestron 9.25 Inch SCT
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Astrodon 52mm screw-in filter cell
Astrodon 52mm screw-in filter cell, top-down view
Astrodon 52mm Screw-in Filter Cell
1/2" Speed Dial (Fits your cordless drill to quickly level your Leveling Screws)
Farpoint Dovetail Weight System 1 — alternate view
Farpoint Dovetail Weight System 1 (6833260593305)
Farpoint Dovetail Weight System 1
Lumicon laser pointer bracket for photo tripod mounting, view 1 of 5
Lumicon laser pointer bracket for photo tripod mounting, view 2 of 5
Lumicon Laser Pointer Bracket - Photo Tripod
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JMI MotoFocus+ motor focuser drive for Meade Cassegrain with hexagonal knob — view 1 of 4
JMI MotoFocus+ motor focuser drive for Meade Cassegrain with hexagonal knob — view 2 of 4
JMI MotoFocus+ Meade Cassegrain with Hexagonal Knob
Farpoint extra 3-pound counterweight view 1 of 4
Farpoint extra 3-pound counterweight view 2 of 4
Farpoint Extra 3 Pound Counterweight
Farpoint Adjustable Bahtinov focus mask for 11 to 14 inch OTAs
Farpoint Bahtinov focus mask product line image
Farpoint Adjustable Bahtinov Focus Mask — 11" to 14" OTAs
Farpoint Tri-Bahtinov focus mask for Celestron 11" RASA telescope
Farpoint Tri-Bahtinov focus mask diffraction pattern illustrating telescope collimation analysis
Farpoint Tri-Bahtinov Mask — Celestron 11" RASA
Lumicon laser pointer bracket for reflector telescope, view 1 of 4
Lumicon laser pointer bracket for reflector telescope, view 2 of 4
Lumicon Laser Pointer Bracket - Reflector
Lumicon 1.25-inch Neutral Density 13 filter for telescope eyepiece
Lumicon 1.25 Inch Neutral Density 13 Filter
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JMI MotoFocus+ Celestron C8 view 1 of 2
JMI MotoFocus+ Celestron C8 view 2 of 2
JMI MotoFocus+ Celestron C8
Farpoint Carey focus mask for 2.5-inch to 4.5-inch telescopes
Farpoint Carey focus mask grommet and screw mounting hardware
Farpoint Carey Focus Mask - 2.5 Inch to 4.5 Inch Telescopes
Farpoint dovetail plate for Celestron 14-inch SCT, primary product view
Farpoint dovetail plate for Celestron 14-inch SCT, alternate view
Farpoint Dovetail Plate - Celestron 14 Inch SCT
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Farpoint reusable desiccant dry pack 4-pack product packaging
Farpoint indicating desiccant packs showing color change between active and saturated states
Farpoint Reusable Dry Pack - 4 Pack