National Astronomy Day

57 products


    You found the Easter Egg! In honor of National Astronomy Day, May 6th get a full 25% off of OSI products not already on sale! Coupon expires May 6th at 23:59 PST.

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    57 products
    Product Shot FVM8 (6795759976601)
    Farpoint Vixen Dovetail Plate - Meade 8 Inch SCT (6795759976601)
    Farpoint Vixen Dovetail Plate - Meade 8 Inch SCT
    Farpoint 14 Inch Universal Dovetail Plate Product Shot (6795758436505)
    Farpoint 14 Inch Universal Dovetail Plate Close up (6795758436505)
    Farpoint 14 Inch Universal Dovetail Plate
    Farpoint Vixen Dovetail Plate - Celestron 8 Inch SCT, New Version (6795807129753)
    Farpoint Vixen Dovetail Plate - Celestron 8 Inch SCT (6795807129753)
    Farpoint Vixen Dovetail Plate - Celestron 8 Inch SCT
    FVUPS7 (6795760795801)
    FVUPS7_2 (6795760795801)
    Farpoint 7 Inch Universal Dovetail Plate - Vixen
    Farpoint 14 Inch Universal Dovetail Plate – Vixen (6795760631961)
    Farpoint 14 Inch Universal Dovetail Plate - Vixen
    Farpoint 10 Inch Metric Universal Dovetail Plate (6795758567577)
    Farpoint 10 Inch Metric Universal Dovetail Plate
    Product Shot FDBB (6795755847833)
    Product Shot FDBB 2 (6795755847833)
    Farpoint Bread Board Style Dovetail Plate
    Farpoint Dovetail Plate - Takahashi Clamshell (6795757813913)
    FDTCS_3 (6795757813913)
    Farpoint Dovetail Plate - Takahashi Clamshell
    Astrodon LRGB Gen2 I-Series Tru-Balance Filters, INDIVIDUAL FILTERS (6795795988633)
    Astrodon LRGB Gen2 E-Series Tru-Balance Filters_comp (6795795988633)
    Astrodon LRGB Gen2 E-Series Tru-Balance Filters, INDIVIDUAL FILTERS
    Farpoint 7 Inch Universal Dovetail Plate (6795758502041)
    Head-on FDUPS (6795758502041)
    Farpoint 7 Inch Universal Dovetail Plate
    Universal D Size, 57.3 Series Dovetail Plate-14inch (6795841831065)
    Universal D Size, 57.3 Series Dovetail Plate-14inch
    Farpoint Dovetail Radius Block - Meade 7 Inch SCT (6795754537113)
    FDM7R_2 (6795754537113)
    Farpoint Dovetail Radius Block - Meade 8 Inch SCT
    FDS7 Product Shot (6795757191321)
    FDS7 Product Shot 2 (6795757191321)
    Farpoint 7 Inch Dovetail Saddle
    Product Shot FDS14 (6795756994713)
    Farpoint 14 Inch Dovetail Saddle 3 (6795756994713)
    Farpoint 14 Inch Dovetail Saddle
    Top down Shot FDTV (6795758207129)
    Farpoint Dovetail Plate - Tele Vue Clamshell
    HandleD-FDA Product Shot (6795814895769)
    HandleD-FDA HAnd Shot (6795814895769)
    D-Handle (only) for Farpoint Dovetail Adapter
    Farpoint Vixen Dovetail Plate - Meade 7 Inch Mak (6795759550617)
    Farpoint Vixen Dovetail Plate - Meade 10 Inch SCT (6795759550617)
    Farpoint Vixen Dovetail Plate - Meade 10 Inch SCT
    FVUPS4 2000x2000 (6795760730265)
    FVUPS4 2000x2000 Shot 2 (6795760730265)
    Farpoint 4 Inch Universal Dovetail Plate - Vixen
    FMDUPS.jpg (6795758731417)
    Farpoint 7 Inch Metric Universal Dovetail Plate
    Product Shot FDC11 (6795755913369)
    Farpoint Dovetail Plate - Celestron 11 Inch SCT (6795755913369)
    Farpoint Dovetail Plate - Celestron 11 Inch SCT
    Farpoint 14 Inch Metric Universal Dovetail Plate (6831691464857)
    Farpoint 14 Inch Metric Universal Dovetail Plate (6831691464857)
    Farpoint 14 Inch Metric Universal Dovetail Plate
    Farpoint Vixen Dovetail Plate - Celestron 11 Inch SCT (6795759124633)
    Farpoint Vixen Dovetail Plate - Celestron 11 Inch SCT (6795759124633)
    Farpoint Vixen Dovetail Plate - Celestron 11 Inch SCT
    Product Shot FDC11 (6795756044441)
    Farpoint Dovetail Plate - Celestron 14 Inch SCT (6795756044441)
    Farpoint Dovetail Plate - Celestron 14 Inch SCT
    Farpoint Extra 3 Pound Counterweight (6795755618457)
    Farpoint Extra 3 Pound Counterweight
    Farpoint Dovetail Radius Block - Meade 10 Inch SCT (6795753881753)
    Farpoint Dovetail Radius Block - Meade 10 Inch SCT
    Farpoint Vixen Dovetail Plate - Armored Strip - Celestron 8 Inch SCT (6795759157401)
    Farpoint Vixen Dovetail Plate - Armored Strip - Celestron 8 Inch SCT (6795759157401)
    Farpoint Vixen Dovetail Plate - Armored Strip - Celestron 8 Inch SCT
    Farpoint Long Dovetail Plate - Celestron 9.25 Inch SCT (6795756208281)
    FDC9.25L (6795756208281)
    Farpoint Long Dovetail Plate - Celestron 9.25 Inch SCT
    Product Shot FVM8-AS (6795760042137)
    Farpoint Vixen Dovetail Plate - Armored Strip - Meade 8 Inch SCT (6795760042137)
    Farpoint Vixen Dovetail Plate - Armored Strip - Meade 8 Inch SCT
    Farpoint Dovetail Ring Screws, Long 1.5" Length (Set of 6)
    Farpoint Dovetail Radius Block - Celestron 9.25 Inch SCT (6795753816217)
    Farpoint Dovetail Radius Block - Celestron 9.25 Inch SCT
    Farpoint Dovetail Radius Blocks - Celestron 14 Inch SCT (6795753586841)
    Farpoint Dovetail Radius Blocks - Celestron 14 Inch SCT
    Farpoint Dovetail Ring Screws, Standard 1" Length (Set of 6)
    Farpoint Dovetail Plate - Vixen VMC260L OTA (6795758993561)
    MountingHoles1.jpg (6795758993561)
    Farpoint Dovetail Plate - Vixen VMC260L OTA
    Farpoint Dovetail Plate - Takahashi Clamshell -Two Mounting Positions (6795758829721)
    FTAP01DPwShell_800.jpg (6795758829721)
    Farpoint Dovetail Plate - Takahashi Clamshell -Two Mounting Positions
    Farpoint Dovetail Radius Block - Celestron 11 Inch SCT (6795753521305)
    Farpoint Dovetail Radius Block - Celestron 11 Inch SCT
    Universal D Size, 57.3 Series Dovetail Plate-21.5 inch (6795916968089)
    DSC_8589 (6795916968089)
    Universal D Size, 57.3 Series Dovetail Plate-21.5 inch
    Farpoint Vixen Dovetail Plate - Meade 7 Inch Mak (6795759255705)
    Farpoint Vixen Dovetail Plate - Celestron 9.25 Inch SCT (pre 2008) (6795759255705)
    Farpoint Vixen Dovetail Plate - Celestron 9.25 Inch SCT (pre 2008)
    Farpoint 22 Inch Side by Side Tandem Connecting Bar (6795757584537)
    Farpoint 22 Inch Side by Side Tandem Connecting Bar
    Farpoint Dovetail Radius Block - Meade 12 Inch SCT (6795754012825)
    Farpoint Dovetail Radius Block - Meade 12 Inch SCT
    Farpoint Vixen Dovetail Plate - Meade 7 Inch Mak (6795759747225)
    Farpoint Vixen Dovetail Plate - Meade 7 Inch Mak (6795759747225)
    Farpoint Vixen Dovetail Plate - Meade 7 Inch Mak