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Thread: help a beginner

  1. #1
    lp_stealth's Avatar
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    Default help a beginner



    Hi I am new around around here and hope this is the right section for this.

    I have had this telescope forever and am getting back into scanning the heavens. I have an omcon 515d the company doesn't seem to exist any more but from what I can tell it is a 6" reflector with a 750mm focal length.

    Currently. I have a 25mm, 10mm and 2x barlow eyepiece.

    I was wondering what the highest power eyepiece would suite this setup and what good quality eyepiece brands are.

    Thanks guys!

  2. #2
    jrkirkham's Avatar
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    If your figures are correct you would have 30X & 75X. Of course the barlow would make that 75X and 150X. Theoretically, on an absolutely perfect night you could go up to 300X, but in reality there aren't that many nights when you will get good viewing past 200X. A 6mm would give you 125X and 250X. If I had that combination, I don't think I would look for more power, but for less power. I would look for something like a 32mm eyepiece to help me hunt objects. What you already have is a good set to start out on. This magnification is assuming that you have a 750MM focal length. Just divide the focal length by the size of the eyepiece.
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  4. #3
    lp_stealth's Avatar
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    Thanks for the reply. I think ill take your advice and go for a 32mm as well as a 6mm ep. What brands should I look for? I don't mind paying for good optics.

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    Quote Originally Posted by lp_stealth View Post
    Thanks for the reply. I think ill take your advice and go for a 32mm as well as a 6mm ep. What brands should I look for? I don't mind paying for good optics.
    Good decision....However he only reason for this post is to say I agree with the other poster... Astronomy is NOT about magnification it is all about gathering as much light and getting that light to your eyeballs...

    The other thing I wanted to comment on is that I also agree 150 percent with the other poster about how much magnification you should expect to be able to use with your telescope...

    Most manufacturers "Guess" that 60x per inch is what any scope can achieve...BUT in the real world 30x or 40 x per inch is what your local light polluted sky will allow you to use...

    No matter which of my many telescopes I use on any given night I will be observing under 150x ...90 percent of the time...but then again I'm into DSO's

    Bob G
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    Quote Originally Posted by lp_stealth View Post
    Thanks for the reply. I think ill take your advice and go for a 32mm as well as a 6mm ep. What brands should I look for? I don't mind paying for good optics.
    You might mind the good optics if you get a good look at the price. . .

    6mm: William Optics 1.25" SPL Series Eyepiece - 6mm

    A decent 6mm at a much better price: Agena Enhanced WA Eyepiece - 6mm

    A decent 32mm Plossl at a ridiculously good price?: 1.25" Plossl Eyepiece F32mm, 57 Degree FOV | eBay I've actually purchased two of them now and think they're pretty good for a Plossl.

    I've really not linked to any of the really high-end eyepieces. When you start to go high-end at 30mm or above you frequently find that they want a 2 inch focuser and a lot of money. I'd stick with the decent eyepieces for now and consider the more expensive eyepieces later. You really can spend thousands of dollars on just one eyepiece. . .

    That said, since your telescope has a focal ratio of about 5, with eyepieces which are only decent you will start to see aberrations near the edges of the field of view. Since you mostly are looking at what is in the center of your field of view that may not bother you overly much.

    FWIW

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  9. #6
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    Thanks for all the help guys.

 

 

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