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    joe 0490's Avatar
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    Default Old eyepiece information



    Hi All;
    I have two very old eyepieces but do not know what the MM is .
    What I have are marked 1/4" FL. and 1/2" FL.
    The 1/4" one has a lens of about 1/8 inch.
    The 1/2" one has a lens of about 3/8 inch.
    I have been using them in a telescope I made and thay work , but not great. I would like to change them to something better, but need to know the MM
    I hope someone may be able to help me out.
    Thanks Much
    JoeB

  2. #2
    sxinias's Avatar
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    Default

    Quote Originally Posted by joe 0490 View Post
    Hi All;
    I have two very old eyepieces but do not know what the MM is .
    What I have are marked 1/4" FL. and 1/2" FL.
    The 1/4" one has a lens of about 1/8 inch.
    The 1/2" one has a lens of about 3/8 inch.
    I have been using them in a telescope I made and thay work , but not great. I would like to change them to something better, but need to know the MM
    I hope someone may be able to help me out.
    Thanks Much
    JoeB
    One inch equals 25.4 mm. A focul length of 1/4" is equal to 6.35 mm and a focal length of 1/2" is 12.7 mm
    SXINIAS

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    ZEQ25 mount;
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    SynScan AZ
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    Mount;

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    ST-80A 80mm Refractor (OTA); Meade
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    203mm SCT (OTA);
    Meade DS2090AT 90mm Refractor; Meade 2045LX3 102mm SCT;

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    4 SE 102mm MAK; Celestron Advanced Series C6S (XLT) 150mm SCT
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  3. #3
    WWPierre's Avatar
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    Default

    Hey Joe, good to see you back. I see you finished your scope. I would love to see pics of it, and some specs.

    Did you ever get Stellarium working?

    You might consider a zoom eyepiece. There is a good bit of information in the stickies at the top of the Eyepieces section.

    Where are you, btw?
    Meade 16" LightBridge; Celestron G-8N Bird-Jones/motorized EQ5;
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    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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  4. #4
    joe 0490's Avatar
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    Default

    Hi All
    I have not been gone, just not posting.I am reading all the time.
    Thanks for the info on the erepieces.I was not shure what I had .Now I can get what I need with a better idea of what is what.
    Thanks Much
    God Bless
    Joe B

 

 

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