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    WWPierre's Avatar
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    Default Replacement O-Rings for Orion Finders-The Real Poop



    I don't know how this information will translate for the metricly inclined, (read most of the world) but for those of us still using Imperial measurements, there is a standard three number designation for O-ring sizes. The first number is the diameter of the cross section, and the next two arbitrarily designate the size of the ring. 0=1/16, 1=3/32, 2=1/8, and so on. If a size has only 2 numbers, it is 1/16". In other words a 33 and 033 are the same.

    The standard Orion finder brackets take 026 for the 30mm model and 033 for the 50mm model.

    I know this because I just bought 6 of each for $3.42, including tax.
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5; Orion 127 Mak/go-to EQ5; Burgess 127f8 refractor; Sky-Watcher 5" F/5 collapsible dob; 90mm Mak/motorized EQ2; Royal Astro 76/910-GEM; Meade 60x700 refractor/alt/az; Zhumell 25x100 Coin Ops; GalilleoScope. Celestron 8mm-24mm zoom; lots of fixed EPs,some good, some..not so much. A small collection of surveying instruments; a forest of tripods; Canon Rebel Xti. Confirmed gadget junkie; Custodian of the Magnetic North Pole (Send $1.00 to Pierre each time you use a compass.)
    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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    We have been broadcasting our presence to the Universe for 100 years now. If there is a detachment of Galactic Pest Control within 100 light years, they are already on the way.

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    Default

    WWPierre
    metricly inclined,
    First time I had to get my Oxford English Diictionary down while on this forum...
    Declan.
    Celestron 8"Edge HD SCT.

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    ED80mm refractor.
    Explore Scientific - 127mm f/7.5 Air-Spaced Triplet ED.
    Lunt - 60mm H-alpha Solar-Telescope with Double Stacked 50 Etalon system, B600 blocking filter and 2 " Crayford Focuser
    orion star shoot solitaire autoguider.
    Canon 5D Mark II
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    Two men sat behind prison bars,One saw mud, the other saw stars. It's not where you are, it's what you see!!!

 

 

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