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  1. #1
    dpwood's Avatar
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    Default planetery eyepiece?



    Hello all.. I see some post on here where people are using a planetery eyepiece, Excuse my dumbness but what defines a planatery eyepiece? The reason im asking is cause maybe i need one or 2
    David
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    Default

    hi and welcome.
    planetary:we normally use higher magnification for
    planetary viewing,mas opposed to lower mag,wide field for
    dso/nebula.
    hope this helps.
    clear skies,

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    andy

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  3. #3
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    Default

    My personal 'weapon of choice' planetary eyepiece is a 7mm 'Ortho'
    On nights when the atmosphere is steady enough to use it, it gives 285x in my C8 - 178x in my dob - or if I barlow it, 256x in my ED100

    It doesn't have the field of view of say... a 7mm plossl, but is very sharp and contrasty.
    For viewing planets - field of view isn't important, but contrast and sharpness are.

    An eyepiece which is regarded as a 'planetary' will usually fit the following description...
    A focal length less than 10mm, to generate high magnifications - usually a fairly simple optical design, to minimise light scatter (for good contrast), but it's FOV will usually suffer because of that.
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  5. #4
    dpwood's Avatar
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    Thanks for the replies guys! I guess the 6mm I have would be one, it has a very small field of view ,its not very clear but I guess that's my scope being maxxed out or the severe light pollution w. I wasw just looking jupiter, my clearest views are with the 15mm and 2x barlow
    David
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    Default

    Do you know the field of view for the 6mm or the 15mm. That tends to define the intended use a little more.

    Sky conditions play a role so you may find the 15mm with barlow which equals 7.5mm was just right, the 6 mm pushed it just that little bit more and you ended up with lumps in your gravy
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    dpwood's Avatar
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    Honestly I do know anything about the eyepeices except the 6mm written it. They camein a kit from celestron called the astromaster accessory kit. I'm guessing their not the best it was only $70. I really need to get some better eyepeices, I bought them when I got tthe scope.
    David
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    Default

    Quote Originally Posted by dpwood View Post
    Honestly I do know anything about the eyepeices except the 6mm written it. They camein a kit from celestron called the astromaster accessory kit. I'm guessing their not the best it was only $70. I really need to get some better eyepeices, I bought them when I got tthe scope.
    Sounds like the same eyepiece I have - If so they are 52 degrees. thats usually considered a little wide for planetary. i have a zoom lens with 40 degree FOV and seems to give better views
    Celestron SE8 - 25mm and 15mm
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  9. #8
    dpwood's Avatar
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    It seems like the 15 has the widest sharpest views. That's what I always use to find stuff then I'll put the barlow in and then ill go to the 10 and barlow. The higher I go the worse everything gets. I hardly ever use the 6 because the field of view is so small. I really want a zoom eyepeice.
    David
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    Quote Originally Posted by dpwood View Post
    It seems like the 15 has the widest sharpest views. That's what I always use to find stuff then I'll put the barlow in and then ill go to the 10 and barlow. The higher I go the worse everything gets. I hardly ever use the 6 because the field of view is so small. I really want a zoom eyepeice.
    My one complaint about my zoom lens is it never clicks or give any indication when you reach one of the marked magnification.

    So you get absorbed in an object work the lens for best view then break away from observing to try and read what the dial is telling you
    Celestron SE8 - 25mm and 15mm
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    Default

    I went with the TMB Planetary eyepieces--

    Quote from their specs- (12mm of eye relief-- in 6mm)

    "The 6mm TMB Planetary has been optimized to show maximum contrast, detail, and definition when viewing bright objects such as the Moon and planets, both on and off axis. It has very high light transmission and contrast, plus minimal lateral color and light scatter."

    I have a 6mm and a 9mm --- both are very good for high magnification.

    TMB Optical Planetary 6mm long eye relief 1.25" Eyepiece TMBP06 | High Point Scientific
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
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    TelescopeMan Web Site

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